update to wayland-rs 0.21

Cargo.toml

@@ -10,12 +10,12 @@ repository = "https://github.com/Smithay/smithay"
 members = [ "anvil" ]
 
 [dependencies]
-wayland-server = "0.20.5"
+wayland-server = "0.21.1"
-wayland-sys = "0.20.5"
+wayland-sys = "0.21.1"
-nix = "0.10.0"
+nix = "0.11"
 xkbcommon = "0.2.1"
 tempfile = "2.1.5"
-slog = { version = "2.1.1" }
+slog = "2.1.1"
 slog-stdlog = "3.0.2"
 libloading = "0.4.0"
 wayland-client = { version = "0.20.5", optional = true }
@@ -27,7 +27,7 @@ input = { version = "0.4.0", optional = true }
 udev = { version = "0.2.0", optional = true }
 dbus = { version = "0.6.1", optional = true }
 systemd = { version = "^0.2.0", optional = true }
-wayland-protocols = { version = "0.20.5", features = ["unstable_protocols", "server"] }
+wayland-protocols = { version = "0.21.1", features = ["unstable_protocols", "native_server"] }
 image = "0.17.0"
 error-chain = "0.11.0"
 lazy_static = "1.0.0"

anvil/Cargo.toml

@@ -11,7 +11,7 @@ slog-term = "2.3"
 slog-async = "2.2"
 rand = "0.3"
 glium = { version = "0.19.0", default-features = false }
-wayland-server = "0.20"
+wayland-server = "0.21"
 xkbcommon = "0.2.1"
 
 [dependencies.smithay]
@@ -28,4 +28,3 @@ winit = [ "smithay/backend_winit" ]
 tty_launch = [ "smithay/backend_libinput", "smithay/backend_drm" ]
 udev = [ "tty_launch", "smithay/backend_udev" ]
 logind = [ "smithay/backend_session_logind" ]
-

anvil/src/main.rs

@@ -11,6 +11,7 @@ extern crate xkbcommon;
 
 use slog::Drain;
 use smithay::wayland_server::Display;
+use smithay::wayland_server::calloop::EventLoop;
 
 #[macro_use]
 mod shaders;
@@ -42,7 +43,8 @@ fn main() {
         o!(),
     );
 
-    let (mut display, mut event_loop) = Display::new();
+    let mut event_loop = EventLoop::<()>::new().unwrap();
+    let mut display = Display::new(event_loop.handle());
 
     let arg = ::std::env::args().nth(1);
     match arg.as_ref().map(|s| &s[..]) {

anvil/src/raw_drm.rs

@@ -15,7 +15,8 @@ use smithay::backend::drm::{drm_device_bind, DrmBackend, DrmDevice, DrmHandler};
 use smithay::backend::graphics::egl::wayland::EGLWaylandExtensions;
 use smithay::wayland::compositor::CompositorToken;
 use smithay::wayland::shm::init_shm_global;
-use smithay::wayland_server::{Display, EventLoop};
+use smithay::wayland_server::Display;
+use smithay::wayland_server::calloop::EventLoop;
 
 use glium::Surface;
 use slog::Logger;
@@ -35,7 +36,7 @@ impl AsRawFd for Card {
 impl BasicDevice for Card {}
 impl ControlDevice for Card {}
 
-pub fn run_raw_drm(mut display: Display, mut event_loop: EventLoop, log: Logger) -> Result<(), ()> {
+pub fn run_raw_drm(mut display: Display, mut event_loop: EventLoop<()>, log: Logger) -> Result<(), ()> {
     /*
      * Initialize the drm backend
      */
@@ -100,9 +101,9 @@ pub fn run_raw_drm(mut display: Display, mut event_loop: EventLoop, log: Logger)
      * Initialize the globals
      */
 
-    init_shm_global(&mut display, event_loop.token(), vec![], log.clone());
+    init_shm_global(&mut display, vec![], log.clone());
 
-    let (compositor_token, _, _, window_map) = init_shell(&mut display, event_loop.token(), log.clone());
+    let (compositor_token, _, _, window_map) = init_shell(&mut display, log.clone());
 
     /*
      * Add a listening socket:
@@ -114,7 +115,7 @@ pub fn run_raw_drm(mut display: Display, mut event_loop: EventLoop, log: Logger)
      * Register the DrmDevice on the EventLoop
      */
     let _source = drm_device_bind(
-        &event_loop.token(),
+        &event_loop.handle(),
         device,
         DrmHandlerImpl {
             compositor_token,
@@ -126,7 +127,7 @@ pub fn run_raw_drm(mut display: Display, mut event_loop: EventLoop, log: Logger)
         .unwrap();
 
     loop {
-        event_loop.dispatch(Some(16)).unwrap();
+        event_loop.dispatch(Some(::std::time::Duration::from_millis(16)), &mut ()).unwrap();
         display.flush_clients();
 
         window_map.borrow_mut().refresh();

anvil/src/shell.rs

@@ -10,7 +10,7 @@ use smithay::wayland::shell::legacy::{wl_shell_init, ShellRequest, ShellState as
 use smithay::wayland::shell::xdg::{xdg_shell_init, PopupConfigure, ShellState as XdgShellState,
                                    ToplevelConfigure, XdgRequest, XdgSurfaceRole};
 use smithay::wayland_server::protocol::{wl_buffer, wl_callback, wl_shell_surface, wl_surface};
-use smithay::wayland_server::{Display, LoopToken, Resource};
+use smithay::wayland_server::{Display, Resource};
 
 use window_map::{Kind as SurfaceKind, WindowMap};
 
@@ -23,7 +23,6 @@ pub type MyCompositorToken = CompositorToken<SurfaceData, Roles>;
 
 pub fn init_shell(
     display: &mut Display,
-    looptoken: LoopToken,
     log: ::slog::Logger,
 ) -> (
     CompositorToken<SurfaceData, Roles>,
@@ -34,11 +33,10 @@ pub fn init_shell(
     // Create the compositor
     let (compositor_token, _, _) = compositor_init(
         display,
-        looptoken.clone(),
+        move |request, surface, ctoken| match request {
-        move |request, (surface, ctoken)| match request {
             SurfaceEvent::Commit => surface_commit(&surface, ctoken),
             SurfaceEvent::Frame { callback } => callback
-                .implement(|e, _| match e {}, None::<fn(_, _)>)
+                .implement(|e, _| match e {}, None::<fn(_)>, ())
                 .send(wl_callback::Event::Done { callback_data: 0 }),
         },
         log.clone(),
@@ -54,9 +52,8 @@ pub fn init_shell(
     let xdg_window_map = window_map.clone();
     let (xdg_shell_state, _, _) = xdg_shell_init(
         display,
-        looptoken.clone(),
         compositor_token,
-        move |shell_event, ()| match shell_event {
+        move |shell_event| match shell_event {
             XdgRequest::NewToplevel { surface } => {
                 // place the window at a random location in the [0;300]x[0;300] square
                 use rand::distributions::{IndependentSample, Range};
@@ -87,9 +84,8 @@ pub fn init_shell(
     let shell_window_map = window_map.clone();
     let (wl_shell_state, _) = wl_shell_init(
         display,
-        looptoken,
         compositor_token,
-        move |req: ShellRequest<_, _, ()>, ()|
+        move |req: ShellRequest<_, _, ()>|
             if let ShellRequest::SetKind {
                 surface,
                 kind: ShellSurfaceKind::Toplevel,

anvil/src/udev.rs

@@ -30,8 +30,8 @@ use smithay::wayland::compositor::CompositorToken;
 use smithay::wayland::output::{Mode, Output, PhysicalProperties};
 use smithay::wayland::seat::Seat;
 use smithay::wayland::shm::init_shm_global;
-use smithay::wayland_server::{Display, EventLoop};
+use smithay::wayland_server::Display;
-use smithay::wayland_server::commons::downcast_impl;
+use smithay::wayland_server::calloop::EventLoop;
 use smithay::wayland_server::protocol::wl_output;
 use smithay::input::Libinput;
 
@@ -39,7 +39,7 @@ use glium_drawer::GliumDrawer;
 use shell::{init_shell, MyWindowMap, Roles, SurfaceData};
 use input_handler::AnvilInputHandler;
 
-pub fn run_udev(mut display: Display, mut event_loop: EventLoop, log: Logger) -> Result<(), ()> {
+pub fn run_udev(mut display: Display, mut event_loop: EventLoop<()>, log: Logger) -> Result<(), ()> {
     let name = display.add_socket_auto().unwrap().into_string().unwrap();
     info!(log, "Listening on wayland socket"; "name" => name.clone());
     ::std::env::set_var("WAYLAND_DISPLAY", name);
@@ -53,14 +53,12 @@ pub fn run_udev(mut display: Display, mut event_loop: EventLoop, log: Logger) ->
      */
     init_shm_global(
         &mut display.borrow_mut(),
-        event_loop.token(),
         vec![],
         log.clone(),
     );
 
     let (compositor_token, _, _, window_map) = init_shell(
         &mut display.borrow_mut(),
-        event_loop.token(),
         log.clone(),
     );
 
@@ -83,7 +81,7 @@ pub fn run_udev(mut display: Display, mut event_loop: EventLoop, log: Logger) ->
 
     let bytes = include_bytes!("../resources/cursor2.rgba");
     let mut udev_backend = UdevBackend::new(
-        event_loop.token(),
+        event_loop.handle(),
         &context,
         session.clone(),
         UdevHandlerImpl {
@@ -104,7 +102,6 @@ pub fn run_udev(mut display: Display, mut event_loop: EventLoop, log: Logger) ->
 
     let (mut w_seat, _) = Seat::new(
         &mut display.borrow_mut(),
-        event_loop.token(),
         session.seat(),
         log.clone(),
     );
@@ -116,13 +113,12 @@ pub fn run_udev(mut display: Display, mut event_loop: EventLoop, log: Logger) ->
 
     let (output, _output_global) = Output::new(
         &mut display.borrow_mut(),
-        event_loop.token(),
         "Drm".into(),
         PhysicalProperties {
             width: 0,
             height: 0,
             subpixel: wl_output::Subpixel::Unknown,
-            maker: "Smithay".into(),
+            make: "Smithay".into(),
             model: "Generic DRM".into(),
         },
         log.clone(),
@@ -162,19 +158,16 @@ pub fn run_udev(mut display: Display, mut event_loop: EventLoop, log: Logger) ->
         pointer_location,
         session,
     ));
-    let libinput_event_source = libinput_bind(libinput_backend, event_loop.token())
+    let libinput_event_source = libinput_bind(libinput_backend, event_loop.handle())
-        .map_err(|(err, _)| err)
         .unwrap();
 
-    let session_event_source = auto_session_bind(notifier, &event_loop.token())
+    let session_event_source = auto_session_bind(notifier, &event_loop.handle())
-        .map_err(|(err, _)| err)
         .unwrap();
-    let udev_event_source = udev_backend_bind(&event_loop.token(), udev_backend)
+    let udev_event_source = udev_backend_bind(udev_backend)
-        .map_err(|(err, _)| err)
         .unwrap();
 
     while running.load(Ordering::SeqCst) {
-        if event_loop.dispatch(Some(16)).is_err() {
+        if event_loop.dispatch(Some(::std::time::Duration::from_millis(16)), &mut ()).is_err() {
             running.store(false, Ordering::SeqCst);
         } else {
             display.borrow_mut().flush_clients();
@@ -187,14 +180,8 @@ pub fn run_udev(mut display: Display, mut event_loop: EventLoop, log: Logger) ->
     notifier.unregister(libinput_session_id);
 
     libinput_event_source.remove();
+    udev_event_source.remove();
 
-    // destroy the udev backend freeing the drm devices
-    //
-    // udev_event_source.remove() returns a Box<Implementation<..>>, downcast_impl
-    // allows us to cast it back to its original type, storing it back into its original
-    // variable to simplify type inference.
-    udev_backend = *(downcast_impl(udev_event_source.remove()).unwrap_or_else(|_| unreachable!()));
-    udev_backend.close();
     Ok(())
 }
 

anvil/src/winit.rs

@@ -10,7 +10,8 @@ use smithay::backend::input::InputBackend;
 use smithay::backend::winit;
 use smithay::backend::graphics::egl::EGLGraphicsBackend;
 use smithay::backend::graphics::egl::wayland::EGLWaylandExtensions;
-use smithay::wayland_server::{Display, EventLoop};
+use smithay::wayland_server::Display;
+use smithay::wayland_server::calloop::EventLoop;
 use smithay::wayland_server::protocol::wl_output;
 
 use slog::Logger;
@@ -19,7 +20,7 @@ use glium_drawer::GliumDrawer;
 use shell::init_shell;
 use input_handler::AnvilInputHandler;
 
-pub fn run_winit(display: &mut Display, event_loop: &mut EventLoop, log: Logger) -> Result<(), ()> {
+pub fn run_winit(display: &mut Display, event_loop: &mut EventLoop<()>, log: Logger) -> Result<(), ()> {
     let (renderer, mut input) = winit::init(log.clone()).map_err(|_| ())?;
 
     let egl_display = Rc::new(RefCell::new(
@@ -44,11 +45,11 @@ pub fn run_winit(display: &mut Display, event_loop: &mut EventLoop, log: Logger)
      * Initialize the globals
      */
 
-    init_shm_global(display, event_loop.token(), vec![], log.clone());
+    init_shm_global(display, vec![], log.clone());
 
-    let (compositor_token, _, _, window_map) = init_shell(display, event_loop.token(), log.clone());
+    let (compositor_token, _, _, window_map) = init_shell(display, log.clone());
 
-    let (mut seat, _) = Seat::new(display, event_loop.token(), "winit".into(), log.clone());
+    let (mut seat, _) = Seat::new(display, "winit".into(), log.clone());
 
     let pointer = seat.add_pointer();
     let keyboard = seat.add_keyboard("", "fr", "oss", None, 1000, 500)
@@ -56,13 +57,12 @@ pub fn run_winit(display: &mut Display, event_loop: &mut EventLoop, log: Logger)
 
     let (output, _) = Output::new(
         display,
-        event_loop.token(),
         "Winit".into(),
         PhysicalProperties {
             width: 0,
             height: 0,
             subpixel: wl_output::Subpixel::Unknown,
-            maker: "Smithay".into(),
+            make: "Smithay".into(),
             model: "Winit".into(),
         },
         log.clone(),
@@ -100,7 +100,10 @@ pub fn run_winit(display: &mut Display, event_loop: &mut EventLoop, log: Logger)
 
         drawer.draw_windows(&*window_map.borrow(), compositor_token, &log);
 
-        event_loop.dispatch(Some(16)).unwrap();
+        event_loop.dispatch(
+            Some(::std::time::Duration::from_millis(16)),
+            &mut ()
+        ).unwrap();
         display.flush_clients();
 
         window_map.borrow_mut().refresh();

src/backend/drm/mod.rs

@@ -150,7 +150,8 @@
 //! #
 //! # fn main() {
 //! #
-//! # let (_display, mut event_loop) = wayland_server::Display::new();
+//! # let mut event_loop = wayland_server::calloop::EventLoop::<()>::new().unwrap();
+//! # let mut display = wayland_server::Display::new(event_loop.handle());
 //! #
 //! # let mut options = OpenOptions::new();
 //! # options.read(true);
@@ -199,12 +200,12 @@
 //! backend.swap_buffers().unwrap();
 //!
 //! let (_source, _device_rc) = drm_device_bind(
-//!     &event_loop.token(),
+//!     &event_loop.handle(),
 //!     device,
 //!     MyDrmHandler(backend)
 //! ).map_err(|(err, _)| err).unwrap();
 //!
-//! event_loop.run().unwrap();
+//! /* And then run the event loop once all your setup is done */
 //! # }
 //! ```
 
@@ -232,9 +233,10 @@ use std::rc::{Rc, Weak};
 use std::sync::{Arc, Once, ONCE_INIT};
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::time::Duration;
-use wayland_server::{Display, LoopToken};
+
-use wayland_server::commons::Implementation;
+use wayland_server::Display;
-use wayland_server::sources::{FdEvent, FdInterest, Source};
+use wayland_server::calloop::{LoopHandle, Source, Ready};
+use wayland_server::calloop::generic::{Generic, EventedRawFd};
 
 mod backend;
 pub mod error;
@@ -546,55 +548,46 @@ pub trait DrmHandler<A: ControlDevice + 'static> {
 /// Bind a `DrmDevice` to an `EventLoop`,
 ///
 /// This will cause it to recieve events and feed them into an `DrmHandler`
-pub fn drm_device_bind<A, H>(
+pub fn drm_device_bind<A, H, Data: 'static>(
-    token: &LoopToken,
+    handle: &LoopHandle<Data>,
     device: DrmDevice<A>,
-    handler: H,
+    mut handler: H,
-) -> ::std::result::Result<(Source<FdEvent>, Rc<RefCell<DrmDevice<A>>>), (IoError, (DrmDevice<A>, H))>
+) -> ::std::result::Result<(Source<Generic<EventedRawFd>>, Rc<RefCell<DrmDevice<A>>>), (IoError, DrmDevice<A>)>
 where
     A: ControlDevice + 'static,
     H: DrmHandler<A> + 'static,
 {
     let fd = device.as_raw_fd();
     let device = Rc::new(RefCell::new(device));
-    match token.add_fd_event_source(
+
-        fd,
+    let mut source = Generic::from_raw_fd(fd);
-        FdInterest::READ,
+    source.set_interest(Ready::readable());
-        DrmFdImpl {
+
-            device: device.clone(),
+    match handle.insert_source(
-            handler,
+        source,
-        },
+        {
+            let device = device.clone();
+            move |_evt, _| {
+                let mut device = device.borrow_mut();
+                process_events(&mut *device, &mut handler);
+            }
+
+        }
     ) {
         Ok(source) => Ok((source, device)),
-        Err((
+        Err(e) => {
-            ioerror,
-            DrmFdImpl {
-                device: device2,
-                handler,
-            },
-        )) => {
-            // make the Rc unique again
-            ::std::mem::drop(device2);
             let device = Rc::try_unwrap(device).unwrap_or_else(|_| unreachable!());
-            Err((ioerror, (device.into_inner(), handler)))
+            Err((e, device.into_inner()))
         }
     }
 }
 
-struct DrmFdImpl<A: ControlDevice + 'static, H> {
+fn process_events<A, H>(device: &mut DrmDevice<A>, handler: &mut H)
-    device: Rc<RefCell<DrmDevice<A>>>,
-    handler: H,
-}
-
-impl<A, H> Implementation<(), FdEvent> for DrmFdImpl<A, H>
 where 
     A: ControlDevice + 'static,
     H: DrmHandler<A> + 'static,
 {
-    fn receive(&mut self, event: FdEvent, (): ()) {
+    match crtc::receive_events(&*device) {
-        let mut device = self.device.borrow_mut();
-        match event {
-            FdEvent::Ready { .. } => match crtc::receive_events(&*device) {
         Ok(events) => for event in events {
             if let crtc::Event::PageFlip(event) = event {
                 if device.active.load(Ordering::SeqCst) {
@@ -609,21 +602,15 @@ where
                         backend.unlock_buffer();
                         trace!(device.logger, "Handling event for backend {:?}", event.crtc);
                         // and then call the user to render the next frame
-                                self.handler
+                        handler
-                                    .ready(&mut device, event.crtc, event.frame, event.duration);
+                            .ready(device, event.crtc, event.frame, event.duration);
                     } else {
                         device.backends.borrow_mut().remove(&event.crtc);
                     }
                 }
             }
         },
-                Err(err) => self.handler.error(&mut device, err),
+        Err(err) => handler.error(device, err),
-            },
-            FdEvent::Error { error, .. } => {
-                warn!(device.logger, "DrmDevice errored: {}", error);
-                self.handler.error(&mut device, error.into());
-            }
-        }
     }
 }
 

src/backend/libinput.rs

@@ -11,9 +11,9 @@ use std::hash::{Hash, Hasher};
 use std::io::Error as IoError;
 use std::os::unix::io::RawFd;
 use std::path::Path;
-use wayland_server::LoopToken;
+
-use wayland_server::commons::Implementation;
+use wayland_server::calloop::{LoopHandle, Source, Ready};
-use wayland_server::sources::{FdEvent, FdInterest, Source};
+use wayland_server::calloop::generic::{Generic, EventedRawFd};
 
 // No idea if this is the same across unix platforms
 // Lets make this linux exclusive for now, once someone tries to build it for
@@ -600,26 +600,19 @@ impl<S: Session> libinput::LibinputInterface for LibinputSessionInterface<S> {
 ///
 /// Automatically feeds the backend with incoming events without any manual calls to
 /// `dispatch_new_events`. Should be used to achieve the smallest possible latency.
-pub fn libinput_bind(
+pub fn libinput_bind<Data: 'static>(
-    backend: LibinputInputBackend,
+    mut backend: LibinputInputBackend,
-    token: LoopToken,
+    handle: LoopHandle<Data>,
-) -> ::std::result::Result<Source<FdEvent>, (IoError, LibinputInputBackend)> {
+) -> ::std::result::Result<Source<Generic<EventedRawFd>>, IoError> {
-    let fd = unsafe { backend.context.fd() };
+    let mut source = Generic::from_raw_fd(unsafe { backend.context.fd() });
-    token.add_fd_event_source(fd, FdInterest::READ, backend)
+    source.set_interest(Ready::readable());
-}
+    handle.insert_source(
-
+        source,
-impl Implementation<(), FdEvent> for LibinputInputBackend {
+        move |_, _| {
-    fn receive(&mut self, event: FdEvent, (): ()) {
-        match event {
-            FdEvent::Ready { .. } => {
             use backend::input::InputBackend;
-                if let Err(error) = self.dispatch_new_events() {
+            if let Err(error) = backend.dispatch_new_events() {
-                    warn!(self.logger, "Libinput errored: {}", error);
+                warn!(backend.logger, "Libinput errored: {}", error);
-                }
-            }
-            FdEvent::Error { error, .. } => {
-                warn!(self.logger, "Libinput fd errored: {}", error);
-            }
             }
         }
+    )
 }

src/backend/session/auto.rs

@@ -1,4 +1,3 @@
-//!
 //! Implementation of the `Session` trait through various implementations
 //! automatically choosing the best available interface.
 //!
@@ -30,7 +29,7 @@
 //! ```
 
 use super::{AsErrno, AsSessionObserver, Session, SessionNotifier, SessionObserver};
-use super::direct::{self, direct_session_bind, DirectSession, DirectSessionNotifier};
+use super::direct::{self, direct_session_bind, DirectSession, DirectSessionNotifier, BoundDirectSession};
 #[cfg(feature = "backend_session_logind")]
 use super::logind::{self, logind_session_bind, BoundLogindSession, LogindSession, LogindSessionNotifier};
 use nix::fcntl::OFlag;
@@ -39,9 +38,8 @@ use std::io::Error as IoError;
 use std::os::unix::io::RawFd;
 use std::path::Path;
 use std::rc::Rc;
-use wayland_server::LoopToken;
+
-use wayland_server::commons::downcast_impl;
+use wayland_server::calloop::LoopHandle;
-use wayland_server::sources::{SignalEvent, Source};
 
 /// `Session` using the best available inteface
 #[derive(Clone)]
@@ -62,7 +60,7 @@ pub enum AutoSessionNotifier {
     Direct(DirectSessionNotifier),
 }
 
-/// Bound session that is driven by the `wayland_server::EventLoop`.
+/// Bound session that is driven by the `calloop::EventLoop`.
 ///
 /// See `auto_session_bind` for details.
 ///
@@ -72,7 +70,7 @@ pub enum BoundAutoSession {
     #[cfg(feature = "backend_session_logind")]
     Logind(BoundLogindSession),
     /// Bound direct / tty session
-    Direct(Source<SignalEvent>),
+    Direct(BoundDirectSession),
 }
 
 /// Id's used by the `AutoSessionNotifier` internally.
@@ -153,16 +151,14 @@ impl AutoSession {
 /// Allows the `AutoSessionNotifier` to listen for incoming signals signalling the session state.
 /// If you don't use this function `AutoSessionNotifier` will not correctly tell you the
 /// session state and call it's `SessionObservers`.
-pub fn auto_session_bind(
+pub fn auto_session_bind<Data: 'static>(
     notifier: AutoSessionNotifier,
-    token: &LoopToken,
+    handle: &LoopHandle<Data>,
-) -> ::std::result::Result<BoundAutoSession, (IoError, AutoSessionNotifier)> {
+) -> ::std::result::Result<BoundAutoSession, IoError> {
     Ok(match notifier {
         #[cfg(feature = "backend_session_logind")]
-        AutoSessionNotifier::Logind(logind) => BoundAutoSession::Logind(logind_session_bind(logind, token)
+        AutoSessionNotifier::Logind(logind) => BoundAutoSession::Logind(logind_session_bind(logind, handle)?),
-            .map_err(|(error, notifier)| (error, AutoSessionNotifier::Logind(notifier)))?),
+        AutoSessionNotifier::Direct(direct) => BoundAutoSession::Direct(direct_session_bind(direct, handle)?),
-        AutoSessionNotifier::Direct(direct) => BoundAutoSession::Direct(direct_session_bind(direct, token)
-            .map_err(|(error, notifier)| (error, AutoSessionNotifier::Direct(notifier)))?),
     })
 }
 
@@ -234,7 +230,6 @@ impl SessionNotifier for AutoSessionNotifier {
             (&mut AutoSessionNotifier::Direct(ref mut direct), AutoId(AutoIdInternal::Direct(signal))) => {
                 direct.unregister(signal)
             }
-            _ => unreachable!(),
         }
     }
 
@@ -260,9 +255,7 @@ impl BoundAutoSession {
         match self {
             #[cfg(feature = "backend_session_logind")]
             BoundAutoSession::Logind(logind) => AutoSessionNotifier::Logind(logind.unbind()),
-            BoundAutoSession::Direct(source) => {
+            BoundAutoSession::Direct(direct) => AutoSessionNotifier::Direct(direct.unbind())
-                AutoSessionNotifier::Direct(*downcast_impl(source.remove()).unwrap_or_else(|_| unreachable!()))
-            }
         }
     }
 }

src/backend/session/dbus/logind.rs

@@ -42,9 +42,9 @@ use std::path::Path;
 use std::rc::{Rc, Weak};
 use std::sync::atomic::{AtomicBool, Ordering};
 use systemd::login;
-use wayland_server::LoopToken;
+
-use wayland_server::commons::Implementation;
+use wayland_server::calloop::{Loophandle, Source, Ready};
-use wayland_server::sources::{FdEvent, FdInterest, Source};
+use wayland_server::calloop::generic::{Generic, EventedRawFd, Event};
 
 struct LogindSessionImpl {
     conn: RefCell<Connection>,
@@ -429,7 +429,7 @@ impl SessionNotifier for LogindSessionNotifier {
 pub struct BoundLogindSession {
     notifier: LogindSessionNotifier,
     _watches: Vec<Watch>,
-    sources: Vec<Source<FdEvent>>,
+    sources: Vec<Source<Generic<EventedRawFd>>>,
 }
 
 /// Bind a `LogindSessionNotifier` to an `EventLoop`.
@@ -437,9 +437,9 @@ pub struct BoundLogindSession {
 /// Allows the `LogindSessionNotifier` to listen for incoming signals signalling the session state.
 /// If you don't use this function `LogindSessionNotifier` will not correctly tell you the logind
 /// session state and call it's `SessionObservers`.
-pub fn logind_session_bind(
+pub fn logind_session_bind<Data: 'static>(
     notifier: LogindSessionNotifier,
-    token: &LoopToken,
+    handle: &LoopHandle<Data>,
 ) -> ::std::result::Result<BoundLogindSession, (IoError, LogindSessionNotifier)> {
     let watches = notifier.internal.conn.borrow().watch_fds();
 
@@ -448,13 +448,14 @@ pub fn logind_session_bind(
         .clone()
         .into_iter()
         .map(|watch| {
-            let mut interest = FdInterest::empty();
+            let source = Generic::from_raw_fd(watch.fd());
-            interest.set(FdInterest::READ, watch.readable());
+            source.set_interest(Ready::readable() | Ready::writable());
-            interest.set(FdInterest::WRITE, watch.writable());
+            handle.insert_source(source, {
-            token.add_fd_event_source(watch.fd(), interest, notifier.clone())
+                let notifier = notifier.clone();
+                move |evt, _| notifier.event(evt)
             })
-        .collect::<::std::result::Result<Vec<Source<FdEvent>>, (IoError, _)>>()
+        }).collect::<::std::result::Result<Vec<Source<FdEvent>>, IoError>>()
-        .map_err(|(err, _)| {
+        .map_err(|err| {
             (
                 err,
                 LogindSessionNotifier {
@@ -495,41 +496,27 @@ impl Drop for LogindSessionNotifier {
     }
 }
 
-impl Implementation<(), FdEvent> for LogindSessionNotifier {
+impl LogindSessionNotifier {
-    fn receive(&mut self, event: FdEvent, (): ()) {
+    fn event(&mut self, event: Event) {
-        match event {
+        let fd = event.source.borrow().0;
-            FdEvent::Ready { fd, mask } => {
+        let readiness = event.readiness;
         let conn = self.internal.conn.borrow();
         let items = conn.watch_handle(
             fd,
-                    match mask {
+            if readiness.readable() && readiness.writable() {
-                        x if x.contains(FdInterest::READ) && x.contains(FdInterest::WRITE) => {
                 WatchEvent::Readable as u32 | WatchEvent::Writable as u32
+            } else if readiness.readable() {
+                WatchEvent::Readable as u32
+            } else if readiness.writable() {
+                WatchEvent::Writable as u32
+            } else {
+                return
             }
-                        x if x.contains(FdInterest::READ) => WatchEvent::Readable as u32,
-                        x if x.contains(FdInterest::WRITE) => WatchEvent::Writable as u32,
-                        _ => return,
-                    },
         );
         if let Err(err) = self.internal.handle_signals(items) {
             error!(self.internal.logger, "Error handling dbus signals: {}", err);
         }
     }
-            FdEvent::Error { fd, error } => {
-                warn!(
-                    self.internal.logger,
-                    "Error on dbus connection: {:?}", error
-                );
-                // handle the remaining messages, they might contain the SessionRemoved event
-                // in case the server did close the connection.
-                let conn = self.internal.conn.borrow();
-                let items = conn.watch_handle(fd, WatchEvent::Error as u32);
-                if let Err(err) = self.internal.handle_signals(items) {
-                    error!(self.internal.logger, "Error handling dbus signals: {}", err);
-                }
-            }
-        }
-    }
 }
 
 error_chain! {

src/backend/session/direct.rs

@@ -52,6 +52,8 @@ use nix::libc::c_int;
 use nix::sys::signal::{self, Signal};
 use nix::sys::stat::{dev_t, fstat, major, minor, Mode};
 use nix::unistd::{close, dup};
+use std::cell::RefCell;
+use std::rc::Rc;
 use std::io::Error as IoError;
 use std::os::unix::io::RawFd;
 use std::path::Path;
@@ -59,29 +61,28 @@ use std::sync::Arc;
 use std::sync::atomic::{AtomicBool, Ordering};
 #[cfg(feature = "backend_session_udev")]
 use udev::Context;
-use wayland_server::LoopToken;
+use wayland_server::calloop::{LoopHandle, Source};
-use wayland_server::commons::Implementation;
+use wayland_server::calloop::signals::Signals;
-use wayland_server::sources::{SignalEvent, Source};
 
 #[allow(dead_code)]
 mod tty {
-    ioctl!(bad read kd_get_mode with 0x4B3B; i16);
+    ioctl_read_bad!(kd_get_mode, 0x4B3B, i16);
-    ioctl!(bad write_int kd_set_mode with 0x4B3A);
+    ioctl_write_int_bad!(kd_set_mode, 0x4B3A);
     pub const KD_TEXT: i16 = 0x00;
     pub const KD_GRAPHICS: i16 = 0x00;
 
-    ioctl!(bad read kd_get_kb_mode with 0x4B44; i32);
+    ioctl_read_bad!(kd_get_kb_mode, 0x4B44, i32);
-    ioctl!(bad write_int kd_set_kb_mode with 0x4B45);
+    ioctl_write_int_bad!(kd_set_kb_mode, 0x4B45);
     pub const K_RAW: i32 = 0x00;
     pub const K_XLATE: i32 = 0x01;
     pub const K_MEDIUMRAW: i32 = 0x02;
     pub const K_UNICODE: i32 = 0x03;
     pub const K_OFF: i32 = 0x04;
 
-    ioctl!(bad write_int vt_activate with 0x5606);
+    ioctl_write_int_bad!(vt_activate, 0x5606);
-    ioctl!(bad write_int vt_wait_active with 0x5607);
+    ioctl_write_int_bad!(vt_wait_active, 0x5607);
-    ioctl!(bad write_ptr vt_set_mode with 0x5602; VtMode);
+    ioctl_write_ptr_bad!(vt_set_mode, 0x5602, VtMode);
-    ioctl!(bad write_int vt_rel_disp with 0x5605);
+    ioctl_write_int_bad!(vt_rel_disp, 0x5605);
     #[repr(C)]
     #[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
     pub struct VtMode {
@@ -367,8 +368,8 @@ impl SessionNotifier for DirectSessionNotifier {
     }
 }
 
-impl Implementation<(), SignalEvent> for DirectSessionNotifier {
+impl DirectSessionNotifier {
-    fn receive(&mut self, _signal: SignalEvent, (): ()) {
+    fn signal_received(&mut self) {
         if self.is_active() {
             info!(self.logger, "Session shall become inactive.");
             for signal in &mut self.signals {
@@ -397,18 +398,47 @@ impl Implementation<(), SignalEvent> for DirectSessionNotifier {
     }
 }
 
+/// Bound logind session that is driven by the `wayland_server::EventLoop`.
+///
+/// See `direct_session_bind` for details.
+pub struct BoundDirectSession {
+    source: Source<Signals>,
+    notifier: Rc<RefCell<DirectSessionNotifier>>
+}
+
+impl BoundDirectSession {
+    /// Unbind the logind session from the `EventLoop`
+    pub fn unbind(self) -> DirectSessionNotifier {
+        let BoundDirectSession { source, notifier } = self;
+        source.remove();
+        match Rc::try_unwrap(notifier) {
+            Ok(notifier) => notifier.into_inner(),
+            Err(_) => panic!("Notifier should have been freed from the event loop!")
+        }
+    }
+}
+
 /// Bind a `DirectSessionNotifier` to an `EventLoop`.
 ///
 /// Allows the `DirectSessionNotifier` to listen for incoming signals signalling the session state.
 /// If you don't use this function `DirectSessionNotifier` will not correctly tell you the current
 /// session state and call it's `SessionObservers`.
-pub fn direct_session_bind(
+pub fn direct_session_bind<Data: 'static>(
     notifier: DirectSessionNotifier,
-    token: &LoopToken,
+    handle: &LoopHandle<Data>,
-) -> ::std::result::Result<Source<SignalEvent>, (IoError, DirectSessionNotifier)> {
+) -> ::std::result::Result<BoundDirectSession, IoError> {
     let signal = notifier.signal;
-
+    let notifier = Rc::new(RefCell::new(notifier));
-    token.add_signal_event_source(signal, notifier)
+    let source = handle.insert_source(
+        Signals::new(&[signal])?,
+        {
+            let notifier = notifier.clone();
+            move |_, _| notifier.borrow_mut().signal_received()
+        }
+    )?;
+    Ok(BoundDirectSession {
+        source, notifier
+    })
 }
 
 error_chain! {

src/backend/udev.rs

@@ -24,9 +24,9 @@ use std::os::unix::io::{AsRawFd, RawFd};
 use std::path::{Path, PathBuf};
 use std::rc::{Rc, Weak};
 use udev::{Context, Enumerator, Event, EventType, MonitorBuilder, MonitorSocket, Result as UdevResult};
-use wayland_server::LoopToken;
+
-use wayland_server::commons::Implementation;
+use wayland_server::calloop::{LoopHandle, Source, Ready};
-use wayland_server::sources::{FdEvent, FdInterest, Source};
+use wayland_server::calloop::generic::{Generic, EventedRawFd};
 
 /// Udev's `DrmDevice` type based on the underlying session
 pub struct SessionFdDrmDevice(RawFd);
@@ -48,18 +48,19 @@ pub struct UdevBackend<
     H: DrmHandler<SessionFdDrmDevice> + 'static,
     S: Session + 'static,
     T: UdevHandler<H> + 'static,
+    Data: 'static
 > {
     _handler: ::std::marker::PhantomData<H>,
-    devices: Rc<RefCell<HashMap<dev_t, (Source<FdEvent>, Rc<RefCell<DrmDevice<SessionFdDrmDevice>>>)>>>,
+    devices: Rc<RefCell<HashMap<dev_t, (Source<Generic<EventedRawFd>>, Rc<RefCell<DrmDevice<SessionFdDrmDevice>>>)>>>,
     monitor: MonitorSocket,
     session: S,
     handler: T,
     logger: ::slog::Logger,
-    token: LoopToken,
+    handle: LoopHandle<Data>,
 }
 
-impl<H: DrmHandler<SessionFdDrmDevice> + 'static, S: Session + 'static, T: UdevHandler<H> + 'static>
+impl<H: DrmHandler<SessionFdDrmDevice> + 'static, S: Session + 'static, T: UdevHandler<H> + 'static, Data: 'static>
-    UdevBackend<H, S, T>
+    UdevBackend<H, S, T, Data>
 {
     /// Creates a new `UdevBackend` and adds it to the given `EventLoop`'s state.
     ///
@@ -70,12 +71,12 @@ impl<H: DrmHandler<SessionFdDrmDevice> + 'static, S: Session + 'static, T: UdevH
     /// `handler` - User-provided handler to respond to any detected changes
     /// `logger`  - slog Logger to be used by the backend and its `DrmDevices`.
     pub fn new<L>(
-        token: LoopToken,
+        handle: LoopHandle<Data>,
         context: &Context,
         mut session: S,
         mut handler: T,
         logger: L,
-    ) -> Result<UdevBackend<H, S, T>>
+    ) -> Result<UdevBackend<H, S, T, Data>>
     where
         L: Into<Option<::slog::Logger>>,
     {
@@ -103,9 +104,9 @@ impl<H: DrmHandler<SessionFdDrmDevice> + 'static, S: Session + 'static, T: UdevH
                         let fd = device.as_raw_fd();
                         match handler.device_added(&mut device) {
                             Some(drm_handler) => {
-                                match drm_device_bind(&token, device, drm_handler) {
+                                match drm_device_bind(&handle, device, drm_handler) {
                                     Ok((event_source, device)) => Some((devnum, (event_source, device))),
-                                    Err((err, (mut device, _))) => {
+                                    Err((err, mut device)) => {
                                         warn!(logger, "Failed to bind device. Error: {:?}.", err);
                                         handler.device_removed(&mut device);
                                         drop(device);
@@ -148,7 +149,7 @@ impl<H: DrmHandler<SessionFdDrmDevice> + 'static, S: Session + 'static, T: UdevH
             session,
             handler,
             logger,
-            token,
+            handle,
         })
     }
 
@@ -174,9 +175,20 @@ impl<H: DrmHandler<SessionFdDrmDevice> + 'static, S: Session + 'static, T: UdevH
     }
 }
 
+impl<
+    H: DrmHandler<SessionFdDrmDevice> + 'static,
+    S: Session + 'static,
+    T: UdevHandler<H> + 'static,
+    Data: 'static,
+> Drop for UdevBackend<H, S, T, Data> {
+    fn drop(&mut self) {
+        self.close();
+    }
+}
+
 /// `SessionObserver` linked to the `UdevBackend` it was created from.
 pub struct UdevBackendObserver {
-    devices: Weak<RefCell<HashMap<dev_t, (Source<FdEvent>, Rc<RefCell<DrmDevice<SessionFdDrmDevice>>>)>>>,
+    devices: Weak<RefCell<HashMap<dev_t, (Source<Generic<EventedRawFd>>, Rc<RefCell<DrmDevice<SessionFdDrmDevice>>>)>>>,
     logger: ::slog::Logger,
 }
 
@@ -184,7 +196,8 @@ impl<
     H: DrmHandler<SessionFdDrmDevice> + 'static,
     S: Session + 'static,
     T: UdevHandler<H> + 'static,
-> AsSessionObserver<UdevBackendObserver> for UdevBackend<H, S, T>
+    Data: 'static,
+> AsSessionObserver<UdevBackendObserver> for UdevBackend<H, S, T, Data>
 {
     fn observer(&mut self) -> UdevBackendObserver {
         UdevBackendObserver {
@@ -218,28 +231,34 @@ impl SessionObserver for UdevBackendObserver {
 ///
 /// Allows the backend to recieve kernel events and thus to drive the `UdevHandler`.
 /// No runtime functionality can be provided without using this function.
-pub fn udev_backend_bind<H, S, T>(
+pub fn udev_backend_bind<H, S, T, Data>(
-    token: &LoopToken,
+    mut udev: UdevBackend<H, S, T, Data>,
-    udev: UdevBackend<H, S, T>,
+) -> ::std::result::Result<Source<Generic<EventedRawFd>>, IoError>
-) -> ::std::result::Result<Source<FdEvent>, (IoError, UdevBackend<H, S, T>)>
 where
     H: DrmHandler<SessionFdDrmDevice> + 'static,
     T: UdevHandler<H> + 'static,
     S: Session + 'static,
 {
     let fd = udev.monitor.as_raw_fd();
-    token.add_fd_event_source(fd, FdInterest::READ, udev)
+    let handle = udev.handle.clone();
+    let mut source = Generic::from_raw_fd(fd);
+    source.set_interest(Ready::readable());
+    handle.insert_source(
+        source,
+        move |_, _| {
+            udev.process_events();
+        }
+    )
 }
 
-impl<H, S, T> Implementation<(), FdEvent> for UdevBackend<H, S, T>
+impl<H, S, T, Data> UdevBackend<H, S, T, Data>
 where
     H: DrmHandler<SessionFdDrmDevice> + 'static,
     T: UdevHandler<H> + 'static,
     S: Session + 'static,
+    Data: 'static
 {
-    fn receive(&mut self, event: FdEvent, (): ()) {
+    fn process_events(&mut self) {
-        match event {
-            FdEvent::Ready { .. } => {
         let events = self.monitor.clone().collect::<Vec<Event>>();
         for event in events {
             match event.event_type() {
@@ -286,11 +305,11 @@ where
                         let fd = device.as_raw_fd();
                         match self.handler.device_added(&mut device) {
                             Some(drm_handler) => {
-                                        match drm_device_bind(&self.token, device, drm_handler) {
+                                match drm_device_bind(&self.handle, device, drm_handler) {
                                     Ok(fd_event_source) => {
                                         self.devices.borrow_mut().insert(devnum, fd_event_source);
                                     }
-                                            Err((err, (mut device, _))) => {
+                                    Err((err, mut device)) => {
                                         warn!(
                                             self.logger,
                                             "Failed to bind device. Error: {:?}.", err
@@ -363,9 +382,6 @@ where
             }
         }
     }
-            FdEvent::Error { error, .. } => self.handler.error(error),
-        }
-    }
 }
 
 /// Handler for the `UdevBackend`, allows to open, close and update drm devices as they change during runtime.

src/wayland/compositor/handlers.rs

@@ -1,11 +1,15 @@
-use super::{CompositorToken, Damage, Rectangle, RectangleKind, Role, RoleType, SubsurfaceRole, SurfaceEvent};
-use super::region::RegionData;
-use super::tree::{Location, SurfaceData};
 use std::cell::RefCell;
 use std::rc::Rc;
-use wayland_server::{LoopToken, NewResource, Resource};
+use std::sync::Mutex;
-use wayland_server::commons::Implementation;
+
 use wayland_server::protocol::{wl_compositor, wl_region, wl_subcompositor, wl_subsurface, wl_surface};
+use wayland_server::{DisplayToken, NewResource, Resource};
+
+use super::tree::{Location, SurfaceData};
+use super::{
+    CompositorToken, Damage, Rectangle, RectangleKind, RegionAttributes, Role, RoleType, SubsurfaceRole,
+    SurfaceEvent,
+};
 
 /*
  * wl_compositor
@@ -13,14 +17,14 @@ use wayland_server::protocol::{wl_compositor, wl_region, wl_subcompositor, wl_su
 
 pub(crate) fn implement_compositor<U, R, Impl>(
     compositor: NewResource<wl_compositor::WlCompositor>,
-    token: LoopToken,
+    token: DisplayToken,
     log: ::slog::Logger,
     implem: Rc<RefCell<Impl>>,
 ) -> Resource<wl_compositor::WlCompositor>
 where
     U: Default + 'static,
     R: Default + 'static,
-    Impl: Implementation<(Resource<wl_surface::WlSurface>, CompositorToken<U, R>), SurfaceEvent> + 'static,
+    Impl: FnMut(SurfaceEvent, Resource<wl_surface::WlSurface>, CompositorToken<U, R>) + 'static,
 {
     let my_token = token.clone();
     compositor.implement_nonsend(
@@ -34,7 +38,8 @@ where
                 implement_region(id, &token);
             }
         },
-        None::<fn(_, _)>,
+        None::<fn(_)>,
+        (),
         &my_token,
     )
 }
@@ -46,95 +51,74 @@ where
 // Internal implementation data of surfaces
 pub(crate) struct SurfaceImplem<U, R> {
     log: ::slog::Logger,
-    implem:
+    implem: Rc<RefCell<FnMut(SurfaceEvent, Resource<wl_surface::WlSurface>, CompositorToken<U, R>)>>,
-        Rc<RefCell<Implementation<(Resource<wl_surface::WlSurface>, CompositorToken<U, R>), SurfaceEvent>>>,
 }
 
 impl<U, R> SurfaceImplem<U, R> {
     fn make<Impl>(log: ::slog::Logger, implem: Rc<RefCell<Impl>>) -> SurfaceImplem<U, R>
     where
-        Impl: Implementation<(Resource<wl_surface::WlSurface>, CompositorToken<U, R>), SurfaceEvent>
+        Impl: FnMut(SurfaceEvent, Resource<wl_surface::WlSurface>, CompositorToken<U, R>) + 'static,
-            + 'static,
     {
-        SurfaceImplem {
+        SurfaceImplem { log, implem }
-            log,
-            implem,
-        }
     }
 }
 
-impl<U, R> Implementation<Resource<wl_surface::WlSurface>, wl_surface::Request> for SurfaceImplem<U, R>
+impl<U, R> SurfaceImplem<U, R>
 where
     U: 'static,
     R: 'static,
 {
-    fn receive(&mut self, req: wl_surface::Request, surface: Resource<wl_surface::WlSurface>) {
+    fn receive_surface_request(
+        &mut self,
+        req: wl_surface::Request,
+        surface: Resource<wl_surface::WlSurface>,
+    ) {
         match req {
-            wl_surface::Request::Attach { buffer, x, y } => unsafe {
+            wl_surface::Request::Attach { buffer, x, y } => {
                 SurfaceData::<U, R>::with_data(&surface, |d| {
                     d.buffer = Some(buffer.map(|b| (b.clone(), (x, y))))
                 });
-            },
+            }
-            wl_surface::Request::Damage {
+            wl_surface::Request::Damage { x, y, width, height } => {
-                x,
-                y,
-                width,
-                height,
-            } => unsafe {
                 SurfaceData::<U, R>::with_data(&surface, |d| {
-                    d.damage = Damage::Surface(Rectangle {
+                    d.damage = Damage::Surface(Rectangle { x, y, width, height })
-                        x,
-                        y,
-                        width,
-                        height,
-                    })
                 });
-            },
+            }
             wl_surface::Request::Frame { callback } => {
                 let mut user_impl = self.implem.borrow_mut();
                 trace!(self.log, "Calling user implementation for wl_surface.frame");
-                user_impl.receive(
+                (&mut *user_impl)(SurfaceEvent::Frame { callback }, surface, CompositorToken::make());
-                    SurfaceEvent::Frame { callback },
-                    (surface, CompositorToken::make()),
-                );
             }
-            wl_surface::Request::SetOpaqueRegion { region } => unsafe {
+            wl_surface::Request::SetOpaqueRegion { region } => {
-                let attributes = region.map(|r| RegionData::get_attributes(&r));
+                let attributes = region.map(|r| {
+                    let attributes_mutex = r.user_data::<Mutex<RegionAttributes>>().unwrap();
+                    attributes_mutex.lock().unwrap().clone()
+                });
                 SurfaceData::<U, R>::with_data(&surface, |d| d.opaque_region = attributes);
-            },
+            }
-            wl_surface::Request::SetInputRegion { region } => unsafe {
+            wl_surface::Request::SetInputRegion { region } => {
-                let attributes = region.map(|r| RegionData::get_attributes(&r));
+                let attributes = region.map(|r| {
+                    let attributes_mutex = r.user_data::<Mutex<RegionAttributes>>().unwrap();
+                    attributes_mutex.lock().unwrap().clone()
+                });
                 SurfaceData::<U, R>::with_data(&surface, |d| d.input_region = attributes);
-            },
+            }
             wl_surface::Request::Commit => {
                 let mut user_impl = self.implem.borrow_mut();
-                trace!(
+                trace!(self.log, "Calling user implementation for wl_surface.commit");
-                    self.log,
+                (&mut *user_impl)(SurfaceEvent::Commit, surface, CompositorToken::make());
-                    "Calling user implementation for wl_surface.commit"
-                );
-                user_impl.receive(SurfaceEvent::Commit, (surface, CompositorToken::make()));
             }
-            wl_surface::Request::SetBufferTransform { transform } => unsafe {
+            wl_surface::Request::SetBufferTransform { transform } => {
                 SurfaceData::<U, R>::with_data(&surface, |d| d.buffer_transform = transform);
-            },
+            }
-            wl_surface::Request::SetBufferScale { scale } => unsafe {
+            wl_surface::Request::SetBufferScale { scale } => {
                 SurfaceData::<U, R>::with_data(&surface, |d| d.buffer_scale = scale);
-            },
+            }
-            wl_surface::Request::DamageBuffer {
+            wl_surface::Request::DamageBuffer { x, y, width, height } => {
-                x,
-                y,
-                width,
-                height,
-            } => unsafe {
                 SurfaceData::<U, R>::with_data(&surface, |d| {
-                    d.damage = Damage::Buffer(Rectangle {
+                    d.damage = Damage::Buffer(Rectangle { x, y, width, height })
-                        x,
-                        y,
-                        width,
-                        height,
-                    })
                 });
-            },
+            }
             wl_surface::Request::Destroy => {
                 // All is already handled by our destructor
             }
@@ -144,25 +128,24 @@ where
 
 fn implement_surface<U, R, Impl>(
     surface: NewResource<wl_surface::WlSurface>,
-    token: &LoopToken,
+    token: &DisplayToken,
     log: ::slog::Logger,
     implem: Rc<RefCell<Impl>>,
 ) -> Resource<wl_surface::WlSurface>
 where
     U: Default + 'static,
     R: Default + 'static,
-    Impl: Implementation<(Resource<wl_surface::WlSurface>, CompositorToken<U, R>), SurfaceEvent> + 'static,
+    Impl: FnMut(SurfaceEvent, Resource<wl_surface::WlSurface>, CompositorToken<U, R>) + 'static,
 {
     let surface = surface.implement_nonsend(
-        SurfaceImplem::make(log, implem),
+        {
-        Some(|surface, _| unsafe {
+            let mut implem = SurfaceImplem::make(log, implem);
-            SurfaceData::<U, R>::cleanup(&surface);
+            move |req, surface| implem.receive_surface_request(req, surface)
-        }),
+        },
+        Some(|surface| SurfaceData::<U, R>::cleanup(&surface)),
+        SurfaceData::<U, R>::new(),
         token,
     );
-    unsafe {
-        SurfaceData::<U, R>::init(&surface);
-    }
     surface
 }
 
@@ -170,63 +153,32 @@ where
  * wl_region
  */
 
-pub(crate) struct RegionImplem;
+fn region_implem(request: wl_region::Request, region: Resource<wl_region::WlRegion>) {
-
+    let attributes_mutex = region.user_data::<Mutex<RegionAttributes>>().unwrap();
-impl Implementation<Resource<wl_region::WlRegion>, wl_region::Request> for RegionImplem {
+    let mut guard = attributes_mutex.lock().unwrap();
-    fn receive(&mut self, request: wl_region::Request, region: Resource<wl_region::WlRegion>) {
-        unsafe {
     match request {
-                wl_region::Request::Add {
+        wl_region::Request::Add { x, y, width, height } => guard
-                    x,
+            .rects
-                    y,
+            .push((RectangleKind::Add, Rectangle { x, y, width, height })),
-                    width,
+        wl_region::Request::Subtract { x, y, width, height } => guard
-                    height,
+            .rects
-                } => RegionData::add_rectangle(
+            .push((RectangleKind::Subtract, Rectangle { x, y, width, height })),
-                    &region,
-                    RectangleKind::Add,
-                    Rectangle {
-                        x,
-                        y,
-                        width,
-                        height,
-                    },
-                ),
-                wl_region::Request::Subtract {
-                    x,
-                    y,
-                    width,
-                    height,
-                } => RegionData::add_rectangle(
-                    &region,
-                    RectangleKind::Subtract,
-                    Rectangle {
-                        x,
-                        y,
-                        width,
-                        height,
-                    },
-                ),
         wl_region::Request::Destroy => {
             // all is handled by our destructor
         }
     }
 }
-    }
-}
 
 fn implement_region(
     region: NewResource<wl_region::WlRegion>,
-    token: &LoopToken,
+    token: &DisplayToken,
 ) -> Resource<wl_region::WlRegion> {
-    let region = region.implement_nonsend(
+    region.implement_nonsend(
-        RegionImplem,
+        region_implem,
-        Some(|region, _| unsafe { RegionData::cleanup(&region) }),
+        None::<fn(_)>,
+        Mutex::new(RegionAttributes::default()),
         token,
-    );
+    )
-    unsafe {
-        RegionData::init(&region);
-    }
-    region
 }
 
 /*
@@ -235,7 +187,7 @@ fn implement_region(
 
 pub(crate) fn implement_subcompositor<U, R>(
     subcompositor: NewResource<wl_subcompositor::WlSubcompositor>,
-    token: LoopToken,
+    token: DisplayToken,
 ) -> Resource<wl_subcompositor::WlSubcompositor>
 where
     R: RoleType + Role<SubsurfaceRole> + 'static,
@@ -244,24 +196,20 @@ where
     let my_token = token.clone();
     subcompositor.implement_nonsend(
         move |request, subcompositor: Resource<_>| match request {
-            wl_subcompositor::Request::GetSubsurface {
+            wl_subcompositor::Request::GetSubsurface { id, surface, parent } => {
-                id,
+                if let Err(()) = SurfaceData::<U, R>::set_parent(&surface, &parent) {
-                surface,
-                parent,
-            } => {
-                if let Err(()) = unsafe { SurfaceData::<U, R>::set_parent(&surface, &parent) } {
                     subcompositor.post_error(
                         wl_subcompositor::Error::BadSurface as u32,
                         "Surface already has a role.".into(),
                     );
                     return;
                 }
-                let subsurface = implement_subsurface::<U, R>(id, &token);
+                implement_subsurface::<U, R>(id, surface.clone(), &token);
-                subsurface.set_user_data(Box::into_raw(Box::new(surface.clone())) as *mut ());
             }
             wl_subcompositor::Request::Destroy => {}
         },
-        None::<fn(_, _)>,
+        None::<fn(_)>,
+        (),
         &my_token,
     )
 }
@@ -270,28 +218,28 @@ where
  * wl_subsurface
  */
 
-unsafe fn with_subsurface_attributes<U, R, F>(subsurface: &Resource<wl_subsurface::WlSubsurface>, f: F)
+fn with_subsurface_attributes<U, R, F>(subsurface: &Resource<wl_subsurface::WlSubsurface>, f: F)
 where
     F: FnOnce(&mut SubsurfaceRole),
     U: 'static,
     R: RoleType + Role<SubsurfaceRole> + 'static,
 {
-    let ptr = subsurface.get_user_data();
+    let surface = subsurface.user_data::<Resource<wl_surface::WlSurface>>().unwrap();
-    let surface = &*(ptr as *mut Resource<wl_surface::WlSurface>);
     SurfaceData::<U, R>::with_role_data::<SubsurfaceRole, _, _>(surface, |d| f(d))
         .expect("The surface does not have a subsurface role while it has a wl_subsurface?!");
 }
 
 fn implement_subsurface<U, R>(
     subsurface: NewResource<wl_subsurface::WlSubsurface>,
-    token: &LoopToken,
+    surface: Resource<wl_surface::WlSurface>,
+    token: &DisplayToken,
 ) -> Resource<wl_subsurface::WlSubsurface>
 where
     U: 'static,
     R: RoleType + Role<SubsurfaceRole> + 'static,
 {
     subsurface.implement_nonsend(
-        |request, subsurface| unsafe {
+        |request, subsurface| {
             match request {
                 wl_subsurface::Request::SetPosition { x, y } => {
                     with_subsurface_attributes::<U, R, _>(&subsurface, |attrs| {
@@ -299,7 +247,7 @@ where
                     })
                 }
                 wl_subsurface::Request::PlaceAbove { sibling } => {
-                    let surface = &*(subsurface.get_user_data() as *mut Resource<wl_surface::WlSurface>);
+                    let surface = subsurface.user_data::<Resource<wl_surface::WlSurface>>().unwrap();
                     if let Err(()) = SurfaceData::<U, R>::reorder(surface, Location::After, &sibling) {
                         subsurface.post_error(
                             wl_subsurface::Error::BadSurface as u32,
@@ -308,7 +256,7 @@ where
                     }
                 }
                 wl_subsurface::Request::PlaceBelow { sibling } => {
-                    let surface = &*(subsurface.get_user_data() as *mut Resource<wl_surface::WlSurface>);
+                    let surface = subsurface.user_data::<Resource<wl_surface::WlSurface>>().unwrap();
                     if let Err(()) = SurfaceData::<U, R>::reorder(surface, Location::Before, &sibling) {
                         subsurface.post_error(
                             wl_subsurface::Error::BadSurface as u32,
@@ -331,21 +279,18 @@ where
                 }
             }
         },
-        Some(|subsurface, _| unsafe {
+        Some(|subsurface| destroy_subsurface::<U, R>(&subsurface)),
-            destroy_subsurface::<U, R>(&subsurface);
+        surface,
-        }),
         token,
     )
 }
 
-unsafe fn destroy_subsurface<U, R>(subsurface: &Resource<wl_subsurface::WlSubsurface>)
+fn destroy_subsurface<U, R>(subsurface: &Resource<wl_subsurface::WlSubsurface>)
 where
     U: 'static,
     R: RoleType + Role<SubsurfaceRole> + 'static,
 {
-    let ptr = subsurface.get_user_data();
+    let surface = subsurface.user_data::<Resource<wl_surface::WlSurface>>().unwrap();
-    subsurface.set_user_data(::std::ptr::null_mut());
-    let surface = Box::from_raw(ptr as *mut Resource<wl_surface::WlSurface>);
     if surface.is_alive() {
         SurfaceData::<U, R>::unset_parent(&surface);
     }

src/wayland/compositor/mod.rs

@@ -43,15 +43,14 @@
 //! define_roles!(MyRoles);
 //!
 //! # fn main() {
-//! # let (mut display, event_loop) = wayland_server::Display::new();
+//! # let mut event_loop = wayland_server::calloop::EventLoop::<()>::new().unwrap();
+//! # let mut display = wayland_server::Display::new(event_loop.handle());
 //! // Call the init function:
 //! let (token, _, _) = compositor_init::<MyData, MyRoles, _, _>(
 //!     &mut display,
-//!     event_loop.token(),
+//!     |request, surface, compositor_token| {
-//!     |request, (surface, compositor_token)| {
 //!         /*
-//!           Your handling of the user requests. This closure can also
+//!           Your handling of the user requests.
-//!           be a struct implementing the appropriate Implementation trait.
 //!          */
 //!     },
 //!     None // put a logger here
@@ -79,21 +78,21 @@
 
 use std::cell::RefCell;
 use std::rc::Rc;
+use std::sync::Mutex;
 
 mod handlers;
-mod tree;
-mod region;
 pub mod roles;
+mod tree;
 
-use self::region::RegionData;
 use self::roles::{Role, RoleType, WrongRole};
 use self::tree::SurfaceData;
 pub use self::tree::TraversalAction;
 use utils::Rectangle;
-use wayland_server::{Display, Global, LoopToken, NewResource, Resource};
-use wayland_server::commons::Implementation;
-use wayland_server::protocol::{wl_buffer, wl_callback, wl_compositor, wl_output, wl_region, wl_subcompositor};
 use wayland_server::protocol::wl_surface::WlSurface;
+use wayland_server::protocol::{
+    wl_buffer, wl_callback, wl_compositor, wl_output, wl_region, wl_subcompositor,
+};
+use wayland_server::{Display, Global, NewResource, Resource};
 
 /// Description of which part of a surface
 /// should be considered damaged and needs to be redrawn
@@ -271,11 +270,7 @@ impl<U: 'static, R: 'static> CompositorToken<U, R> {
     where
         F: FnOnce(&mut SurfaceAttributes<U>) -> T,
     {
-        assert!(
+        SurfaceData::<U, R>::with_data(surface, f)
-            surface.is_implemented_with::<self::handlers::SurfaceImplem<U, R>>(),
-            "Accessing the data of foreign surfaces is not supported."
-        );
-        unsafe { SurfaceData::<U, R>::with_data(surface, f) }
     }
 }
 
@@ -309,13 +304,7 @@ where
     where
         F: FnMut(&Resource<WlSurface>, &mut SurfaceAttributes<U>, &mut R, &T) -> TraversalAction<T>,
     {
-        assert!(
-            surface.is_implemented_with::<self::handlers::SurfaceImplem<U, R>>(),
-            "Accessing the data of foreign surfaces is not supported."
-        );
-        unsafe {
         SurfaceData::<U, R>::map_tree(surface, initial, f, false);
-        }
         Ok(())
     }
 
@@ -335,13 +324,7 @@ where
     where
         F: FnMut(&Resource<WlSurface>, &mut SurfaceAttributes<U>, &mut R, &T) -> TraversalAction<T>,
     {
-        assert!(
-            surface.is_implemented_with::<self::handlers::SurfaceImplem<U, R>>(),
-            "Accessing the data of foreign surfaces is not supported."
-        );
-        unsafe {
         SurfaceData::<U, R>::map_tree(surface, initial, f, true);
-        }
         Ok(())
     }
 
@@ -352,11 +335,7 @@ where
     /// If the surface is not managed by the CompositorGlobal that provided this token, this
     /// will panic (having more than one compositor is not supported).
     pub fn get_parent(&self, surface: &Resource<WlSurface>) -> Option<Resource<WlSurface>> {
-        assert!(
+        SurfaceData::<U, R>::get_parent(surface)
-            surface.is_implemented_with::<self::handlers::SurfaceImplem<U, R>>(),
-            "Accessing the data of foreign surfaces is not supported."
-        );
-        unsafe { SurfaceData::<U, R>::get_parent(surface) }
     }
 
     /// Retrieve the children of this surface
@@ -364,11 +343,7 @@ where
     /// If the surface is not managed by the CompositorGlobal that provided this token, this
     /// will panic (having more than one compositor is not supported).
     pub fn get_children(&self, surface: &Resource<WlSurface>) -> Vec<Resource<WlSurface>> {
-        assert!(
+        SurfaceData::<U, R>::get_children(surface)
-            surface.is_implemented_with::<self::handlers::SurfaceImplem<U, R>>(),
-            "Accessing the data of foreign surfaces is not supported."
-        );
-        unsafe { SurfaceData::<U, R>::get_children(surface) }
     }
 }
 
@@ -378,11 +353,7 @@ impl<U: 'static, R: RoleType + 'static> CompositorToken<U, R> {
     /// If the surface is not managed by the CompositorGlobal that provided this token, this
     /// will panic (having more than one compositor is not supported).
     pub fn has_a_role(&self, surface: &Resource<WlSurface>) -> bool {
-        assert!(
+        SurfaceData::<U, R>::has_a_role(surface)
-            surface.is_implemented_with::<self::handlers::SurfaceImplem<U, R>>(),
-            "Accessing the data of foreign surfaces is not supported."
-        );
-        unsafe { SurfaceData::<U, R>::has_a_role(surface) }
     }
 
     /// Check wether this surface as a specific role
@@ -393,11 +364,7 @@ impl<U: 'static, R: RoleType + 'static> CompositorToken<U, R> {
     where
         R: Role<RoleData>,
     {
-        assert!(
+        SurfaceData::<U, R>::has_role::<RoleData>(surface)
-            surface.is_implemented_with::<self::handlers::SurfaceImplem<U, R>>(),
-            "Accessing the data of foreign surfaces is not supported."
-        );
-        unsafe { SurfaceData::<U, R>::has_role::<RoleData>(surface) }
     }
 
     /// Register that this surface has given role with default data
@@ -411,11 +378,7 @@ impl<U: 'static, R: RoleType + 'static> CompositorToken<U, R> {
         R: Role<RoleData>,
         RoleData: Default,
     {
-        assert!(
+        SurfaceData::<U, R>::give_role::<RoleData>(surface)
-            surface.is_implemented_with::<self::handlers::SurfaceImplem<U, R>>(),
-            "Accessing the data of foreign surfaces is not supported."
-        );
-        unsafe { SurfaceData::<U, R>::give_role::<RoleData>(surface) }
     }
 
     /// Register that this surface has given role with given data
@@ -432,11 +395,7 @@ impl<U: 'static, R: RoleType + 'static> CompositorToken<U, R> {
     where
         R: Role<RoleData>,
     {
-        assert!(
+        SurfaceData::<U, R>::give_role_with::<RoleData>(surface, data)
-            surface.is_implemented_with::<self::handlers::SurfaceImplem<U, R>>(),
-            "Accessing the data of foreign surfaces is not supported."
-        );
-        unsafe { SurfaceData::<U, R>::give_role_with::<RoleData>(surface, data) }
     }
 
     /// Access the role data of a surface
@@ -450,11 +409,7 @@ impl<U: 'static, R: RoleType + 'static> CompositorToken<U, R> {
         R: Role<RoleData>,
         F: FnOnce(&mut RoleData) -> T,
     {
-        assert!(
+        SurfaceData::<U, R>::with_role_data::<RoleData, _, _>(surface, f)
-            surface.is_implemented_with::<self::handlers::SurfaceImplem<U, R>>(),
-            "Accessing the data of foreign surfaces is not supported."
-        );
-        unsafe { SurfaceData::<U, R>::with_role_data::<RoleData, _, _>(surface, f) }
     }
 
     /// Register that this surface does not have a role any longer and retrieve the data
@@ -467,11 +422,7 @@ impl<U: 'static, R: RoleType + 'static> CompositorToken<U, R> {
     where
         R: Role<RoleData>,
     {
-        assert!(
+        SurfaceData::<U, R>::remove_role::<RoleData>(surface)
-            surface.is_implemented_with::<self::handlers::SurfaceImplem<U, R>>(),
-            "Accessing the data of foreign surfaces is not supported."
-        );
-        unsafe { SurfaceData::<U, R>::remove_role::<RoleData>(surface) }
     }
 
     /// Retrieve the metadata associated with a wl_region
@@ -479,11 +430,10 @@ impl<U: 'static, R: RoleType + 'static> CompositorToken<U, R> {
     /// If the region is not managed by the CompositorGlobal that provided this token, this
     /// will panic (having more than one compositor is not supported).
     pub fn get_region_attributes(&self, region: &Resource<wl_region::WlRegion>) -> RegionAttributes {
-        assert!(
+        match region.user_data::<Mutex<RegionAttributes>>() {
-            region.is_implemented_with::<self::handlers::RegionImplem>(),
+            Some(mutex) => mutex.lock().unwrap().clone(),
-            "Accessing the data of foreign regions is not supported."
+            None => panic!("Accessing the data of foreign regions is not supported."),
-        );
+        }
-        unsafe { RegionData::get_attributes(region) }
     }
 }
 
@@ -497,7 +447,6 @@ impl<U: 'static, R: RoleType + 'static> CompositorToken<U, R> {
 /// globals from the event loop in the future.
 pub fn compositor_init<U, R, Impl, L>(
     display: &mut Display,
-    token: LoopToken,
     implem: Impl,
     logger: L,
 ) -> (
@@ -509,15 +458,15 @@ where
     L: Into<Option<::slog::Logger>>,
     U: Default + 'static,
     R: Default + RoleType + Role<SubsurfaceRole> + 'static,
-    Impl: Implementation<(Resource<WlSurface>, CompositorToken<U, R>), SurfaceEvent> + 'static,
+    Impl: FnMut(SurfaceEvent, Resource<WlSurface>, CompositorToken<U, R>) + 'static,
 {
     let log = ::slog_or_stdlog(logger).new(o!("smithay_module" => "compositor_handler"));
     let implem = Rc::new(RefCell::new(implem));
 
-    let comp_token = token.clone();
+    let comp_token = display.get_token();
-    let sub_token = token.clone();
+    let sub_token = display.get_token();
 
-    let compositor = display.create_global(&token, 4, move |_version, new_compositor| {
+    let compositor = display.create_global(4, move |new_compositor, _version| {
         self::handlers::implement_compositor::<U, R, Impl>(
             new_compositor,
             comp_token.clone(),
@@ -526,7 +475,7 @@ where
         );
     });
 
-    let subcompositor = display.create_global(&token, 1, move |_version, new_subcompositor| {
+    let subcompositor = display.create_global(1, move |new_subcompositor, _version| {
         self::handlers::implement_subcompositor::<U, R>(new_subcompositor, sub_token.clone());
     });
 

src/wayland/compositor/region.rs

@@ -1,44 +0,0 @@
-use super::{Rectangle, RectangleKind, RegionAttributes};
-use std::sync::Mutex;
-use wayland_server::Resource;
-use wayland_server::protocol::wl_region;
-
-#[derive(Default)]
-pub struct RegionData {
-    attributes: RegionAttributes,
-}
-
-impl RegionData {
-    /// Initialize the user_data of a region, must be called right when the surface is created
-    pub unsafe fn init(region: &Resource<wl_region::WlRegion>) {
-        region.set_user_data(Box::into_raw(Box::new(Mutex::new(RegionData::default()))) as *mut _)
-    }
-
-    /// Cleans the user_data of that surface, must be called when it is destroyed
-    pub unsafe fn cleanup(region: &Resource<wl_region::WlRegion>) {
-        let ptr = region.get_user_data();
-        region.set_user_data(::std::ptr::null_mut());
-        let _my_data_mutex: Box<Mutex<RegionData>> = Box::from_raw(ptr as *mut _);
-    }
-
-    unsafe fn get_data(region: &Resource<wl_region::WlRegion>) -> &Mutex<RegionData> {
-        let ptr = region.get_user_data();
-        &*(ptr as *mut _)
-    }
-
-    pub unsafe fn get_attributes(region: &Resource<wl_region::WlRegion>) -> RegionAttributes {
-        let data_mutex = Self::get_data(region);
-        let data_guard = data_mutex.lock().unwrap();
-        data_guard.attributes.clone()
-    }
-
-    pub unsafe fn add_rectangle(
-        region: &Resource<wl_region::WlRegion>,
-        kind: RectangleKind,
-        rect: Rectangle,
-    ) {
-        let data_mutex = Self::get_data(region);
-        let mut data_guard = data_mutex.lock().unwrap();
-        data_guard.attributes.rects.push((kind, rect));
-    }
-}

src/wayland/compositor/tree.rs

@@ -1,8 +1,8 @@
-use super::{SubsurfaceRole, SurfaceAttributes};
 use super::roles::*;
+use super::{SubsurfaceRole, SurfaceAttributes};
 use std::sync::Mutex;
-use wayland_server::Resource;
 use wayland_server::protocol::wl_surface::WlSurface;
+use wayland_server::Resource;
 
 /// Node of a subsurface tree, holding some user specified data type U
 /// at each node
@@ -20,9 +20,6 @@ use wayland_server::protocol::wl_surface::WlSurface;
 /// a tree, but with loops allowed. This is because the wayland protocol does not
 /// have a failure case to forbid this. Note that if any node in such a graph does not
 /// have a parent, then the graph is a tree and this node is its root.
-///
-/// All the methods here are unsafe, because they assume the provided `wl_surface` object
-/// is correctly initialized regarding its `user_data`.
 pub struct SurfaceData<U, R> {
     parent: Option<Resource<WlSurface>>,
     children: Vec<Resource<WlSurface>>,
@@ -46,18 +43,13 @@ pub enum TraversalAction<T> {
 }
 
 impl<U: Default, R: Default> SurfaceData<U, R> {
-    fn new() -> SurfaceData<U, R> {
+    pub fn new() -> Mutex<SurfaceData<U, R>> {
-        SurfaceData {
+        Mutex::new(SurfaceData {
             parent: None,
             children: Vec::new(),
             role: Default::default(),
             attributes: Default::default(),
-        }
+        })
-    }
-
-    /// Initialize the user_data of a surface, must be called right when the surface is created
-    pub unsafe fn init(surface: &Resource<WlSurface>) {
-        surface.set_user_data(Box::into_raw(Box::new(Mutex::new(SurfaceData::<U, R>::new()))) as *mut _)
     }
 }
 
@@ -66,21 +58,14 @@ where
     U: 'static,
     R: 'static,
 {
-    unsafe fn get_data(surface: &Resource<WlSurface>) -> &Mutex<SurfaceData<U, R>> {
-        let ptr = surface.get_user_data();
-        &*(ptr as *mut _)
-    }
-
     /// Cleans the user_data of that surface, must be called when it is destroyed
-    pub unsafe fn cleanup(surface: &Resource<WlSurface>) {
+    pub fn cleanup(surface: &Resource<WlSurface>) {
-        let ptr = surface.get_user_data();
+        let my_data_mutex = surface.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
-        surface.set_user_data(::std::ptr::null_mut());
+        let mut my_data = my_data_mutex.lock().unwrap();
-        let my_data_mutex: Box<Mutex<SurfaceData<U, R>>> = Box::from_raw(ptr as *mut _);
-        let mut my_data = my_data_mutex.into_inner().unwrap();
         if let Some(old_parent) = my_data.parent.take() {
             if !old_parent.equals(surface) {
                 // We had a parent that is not ourselves, lets unregister ourselves from it
-                let old_parent_mutex = Self::get_data(&old_parent);
+                let old_parent_mutex = old_parent.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
                 let mut old_parent_guard = old_parent_mutex.lock().unwrap();
                 old_parent_guard.children.retain(|c| !c.equals(surface));
             }
@@ -91,7 +76,7 @@ where
             if child.equals(surface) {
                 continue;
             }
-            let child_mutex = Self::get_data(child);
+            let child_mutex = child.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
             let mut child_guard = child_mutex.lock().unwrap();
             child_guard.parent = None;
         }
@@ -99,32 +84,32 @@ where
 }
 
 impl<U: 'static, R: RoleType + 'static> SurfaceData<U, R> {
-    pub unsafe fn has_a_role(surface: &Resource<WlSurface>) -> bool {
+    pub fn has_a_role(surface: &Resource<WlSurface>) -> bool {
         debug_assert!(surface.is_alive());
-        let data_mutex = Self::get_data(surface);
+        let data_mutex = surface.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
         let data_guard = data_mutex.lock().unwrap();
         <R as RoleType>::has_role(&data_guard.role)
     }
 
     /// Check wether a surface has a given role
-    pub unsafe fn has_role<RoleData>(surface: &Resource<WlSurface>) -> bool
+    pub fn has_role<RoleData>(surface: &Resource<WlSurface>) -> bool
     where
         R: Role<RoleData>,
     {
         debug_assert!(surface.is_alive());
-        let data_mutex = Self::get_data(surface);
+        let data_mutex = surface.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
         let data_guard = data_mutex.lock().unwrap();
         <R as Role<RoleData>>::has(&data_guard.role)
     }
 
     /// Register that this surface has a role, fails if it already has one
-    pub unsafe fn give_role<RoleData>(surface: &Resource<WlSurface>) -> Result<(), ()>
+    pub fn give_role<RoleData>(surface: &Resource<WlSurface>) -> Result<(), ()>
     where
         R: Role<RoleData>,
         RoleData: Default,
     {
         debug_assert!(surface.is_alive());
-        let data_mutex = Self::get_data(surface);
+        let data_mutex = surface.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
         let mut data_guard = data_mutex.lock().unwrap();
         <R as Role<RoleData>>::set(&mut data_guard.role)
     }
@@ -132,15 +117,12 @@ impl<U: 'static, R: RoleType + 'static> SurfaceData<U, R> {
     /// Register that this surface has a role with given data
     ///
     /// Fails if it already has one and returns the data
-    pub unsafe fn give_role_with<RoleData>(
+    pub fn give_role_with<RoleData>(surface: &Resource<WlSurface>, data: RoleData) -> Result<(), RoleData>
-        surface: &Resource<WlSurface>,
-        data: RoleData,
-    ) -> Result<(), RoleData>
     where
         R: Role<RoleData>,
     {
         debug_assert!(surface.is_alive());
-        let data_mutex = Self::get_data(surface);
+        let data_mutex = surface.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
         let mut data_guard = data_mutex.lock().unwrap();
         <R as Role<RoleData>>::set_with(&mut data_guard.role, data)
     }
@@ -149,24 +131,24 @@ impl<U: 'static, R: RoleType + 'static> SurfaceData<U, R> {
     ///
     /// It is a noop if this surface already didn't have one, but fails if
     /// the role was "subsurface", it must be removed by the `unset_parent` method.
-    pub unsafe fn remove_role<RoleData>(surface: &Resource<WlSurface>) -> Result<RoleData, WrongRole>
+    pub fn remove_role<RoleData>(surface: &Resource<WlSurface>) -> Result<RoleData, WrongRole>
     where
         R: Role<RoleData>,
     {
         debug_assert!(surface.is_alive());
-        let data_mutex = Self::get_data(surface);
+        let data_mutex = surface.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
         let mut data_guard = data_mutex.lock().unwrap();
         <R as Role<RoleData>>::unset(&mut data_guard.role)
     }
 
     /// Access to the role data
-    pub unsafe fn with_role_data<RoleData, F, T>(surface: &Resource<WlSurface>, f: F) -> Result<T, WrongRole>
+    pub fn with_role_data<RoleData, F, T>(surface: &Resource<WlSurface>, f: F) -> Result<T, WrongRole>
     where
         R: Role<RoleData>,
         F: FnOnce(&mut RoleData) -> T,
     {
         debug_assert!(surface.is_alive());
-        let data_mutex = Self::get_data(surface);
+        let data_mutex = surface.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
         let mut data_guard = data_mutex.lock().unwrap();
         let data = <R as Role<RoleData>>::data_mut(&mut data_guard.role)?;
         Ok(f(data))
@@ -178,13 +160,13 @@ impl<U: 'static, R: RoleType + Role<SubsurfaceRole> + 'static> SurfaceData<U, R>
     ///
     /// if this surface already has a role, does nothing and fails, otherwise
     /// its role is now to be a subsurface
-    pub unsafe fn set_parent(child: &Resource<WlSurface>, parent: &Resource<WlSurface>) -> Result<(), ()> {
+    pub fn set_parent(child: &Resource<WlSurface>, parent: &Resource<WlSurface>) -> Result<(), ()> {
         debug_assert!(child.is_alive());
         debug_assert!(parent.is_alive());
 
         // change child's parent
         {
-            let child_mutex = Self::get_data(child);
+            let child_mutex = child.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
             let mut child_guard = child_mutex.lock().unwrap();
             // if surface already has a role, it cannot become a subsurface
             <R as Role<SubsurfaceRole>>::set(&mut child_guard.role)?;
@@ -194,7 +176,7 @@ impl<U: 'static, R: RoleType + Role<SubsurfaceRole> + 'static> SurfaceData<U, R>
         // register child to new parent
         // double scoping is to be robust to have a child be its own parent
         {
-            let parent_mutex = Self::get_data(parent);
+            let parent_mutex = parent.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
             let mut parent_guard = parent_mutex.lock().unwrap();
             parent_guard.children.push(child.clone())
         }
@@ -204,10 +186,10 @@ impl<U: 'static, R: RoleType + Role<SubsurfaceRole> + 'static> SurfaceData<U, R>
     /// Remove a pre-existing parent of this child
     ///
     /// Does nothing if it has no parent
-    pub unsafe fn unset_parent(child: &Resource<WlSurface>) {
+    pub fn unset_parent(child: &Resource<WlSurface>) {
         debug_assert!(child.is_alive());
         let old_parent = {
-            let child_mutex = Self::get_data(child);
+            let child_mutex = child.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
             let mut child_guard = child_mutex.lock().unwrap();
             let old_parent = child_guard.parent.take();
             if old_parent.is_some() {
@@ -219,22 +201,22 @@ impl<U: 'static, R: RoleType + Role<SubsurfaceRole> + 'static> SurfaceData<U, R>
         };
         // unregister from our parent
         if let Some(old_parent) = old_parent {
-            let parent_mutex = Self::get_data(&old_parent);
+            let parent_mutex = old_parent.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
             let mut parent_guard = parent_mutex.lock().unwrap();
             parent_guard.children.retain(|c| !c.equals(child));
         }
     }
 
     /// Retrieve the parent surface (if any) of this surface
-    pub unsafe fn get_parent(child: &Resource<WlSurface>) -> Option<Resource<WlSurface>> {
+    pub fn get_parent(child: &Resource<WlSurface>) -> Option<Resource<WlSurface>> {
-        let child_mutex = Self::get_data(child);
+        let child_mutex = child.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
         let child_guard = child_mutex.lock().unwrap();
         child_guard.parent.as_ref().cloned()
     }
 
     /// Retrieve the parent surface (if any) of this surface
-    pub unsafe fn get_children(child: &Resource<WlSurface>) -> Vec<Resource<WlSurface>> {
+    pub fn get_children(child: &Resource<WlSurface>) -> Vec<Resource<WlSurface>> {
-        let child_mutex = Self::get_data(child);
+        let child_mutex = child.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
         let child_guard = child_mutex.lock().unwrap();
         child_guard.children.to_vec()
     }
@@ -242,13 +224,13 @@ impl<U: 'static, R: RoleType + Role<SubsurfaceRole> + 'static> SurfaceData<U, R>
     /// Reorders a surface relative to one of its sibling
     ///
     /// Fails if `relative_to` is not a sibling or parent of `surface`.
-    pub unsafe fn reorder(
+    pub fn reorder(
         surface: &Resource<WlSurface>,
         to: Location,
         relative_to: &Resource<WlSurface>,
     ) -> Result<(), ()> {
         let parent = {
-            let data_mutex = Self::get_data(surface);
+            let data_mutex = surface.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
             let data_guard = data_mutex.lock().unwrap();
             data_guard.parent.as_ref().cloned().unwrap()
         };
@@ -266,7 +248,7 @@ impl<U: 'static, R: RoleType + Role<SubsurfaceRole> + 'static> SurfaceData<U, R>
             None
         }
 
-        let parent_mutex = Self::get_data(&parent);
+        let parent_mutex = parent.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
         let mut parent_guard = parent_mutex.lock().unwrap();
         let my_index = index_of(surface, &parent_guard.children).unwrap();
         let mut other_index = match index_of(surface, &parent_guard.children) {
@@ -291,11 +273,13 @@ impl<U: 'static, R: 'static> SurfaceData<U, R> {
     ///
     /// Note that an internal lock is taken during access of this data,
     /// so the tree cannot be manipulated at the same time
-    pub unsafe fn with_data<T, F>(surface: &Resource<WlSurface>, f: F) -> T
+    pub fn with_data<T, F>(surface: &Resource<WlSurface>, f: F) -> T
     where
         F: FnOnce(&mut SurfaceAttributes<U>) -> T,
     {
-        let data_mutex = Self::get_data(surface);
+        let data_mutex = surface
+            .user_data::<Mutex<SurfaceData<U, R>>>()
+            .expect("Accessing the data of foreign surfaces is not supported.");
         let mut data_guard = data_mutex.lock().unwrap();
         f(&mut data_guard.attributes)
     }
@@ -308,12 +292,12 @@ impl<U: 'static, R: 'static> SurfaceData<U, R> {
     ///
     /// The callback returns wether the traversal should continue or not. Returning
     /// false will cause an early-stopping.
-    pub unsafe fn map_tree<F, T>(root: &Resource<WlSurface>, initial: T, mut f: F, reverse: bool)
+    pub fn map_tree<F, T>(root: &Resource<WlSurface>, initial: T, mut f: F, reverse: bool)
     where
         F: FnMut(&Resource<WlSurface>, &mut SurfaceAttributes<U>, &mut R, &T) -> TraversalAction<T>,
     {
         // helper function for recursion
-        unsafe fn map<U: 'static, R: 'static, F, T>(
+        fn map<U: 'static, R: 'static, F, T>(
             surface: &Resource<WlSurface>,
             root: &Resource<WlSurface>,
             initial: &T,
@@ -328,16 +312,11 @@ impl<U: 'static, R: 'static> SurfaceData<U, R> {
                 return true;
             }
 
-            let data_mutex = SurfaceData::<U, R>::get_data(surface);
+            let data_mutex = surface.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
             let mut data_guard = data_mutex.lock().unwrap();
             let data_guard = &mut *data_guard;
             // call the callback on ourselves
-            match f(
+            match f(surface, &mut data_guard.attributes, &mut data_guard.role, initial) {
-                surface,
-                &mut data_guard.attributes,
-                &mut data_guard.role,
-                initial,
-            ) {
                 TraversalAction::DoChildren(t) => {
                     // loop over children
                     if reverse {
@@ -360,16 +339,13 @@ impl<U: 'static, R: 'static> SurfaceData<U, R> {
             }
         }
 
-        let data_mutex = Self::get_data(root);
+        let data_mutex = root.user_data::<Mutex<SurfaceData<U, R>>>().unwrap();
         let mut data_guard = data_mutex.lock().unwrap();
         let data_guard = &mut *data_guard;
         // call the callback on ourselves
-        if let TraversalAction::DoChildren(t) = f(
+        if let TraversalAction::DoChildren(t) =
-            root,
+            f(root, &mut data_guard.attributes, &mut data_guard.role, &initial)
-            &mut data_guard.attributes,
+        {
-            &mut data_guard.role,
-            &initial,
-        ) {
             // loop over children
             if reverse {
                 for c in data_guard.children.iter().rev() {

src/wayland/mod.rs

@@ -7,16 +7,10 @@
 //!
 //! - An init function or method will take the event loop as argument and
 //!   insert one or more globals into it.
-//! - These functions will return the `Global` handles and, if applicable,
-//!   a `StateToken` allowing you to access the associated state value in
-//!   this event loop.
 //! - If you want to remove a previously inserted global, just call the
 //!   `destroy()` method on the associated `Global`. If you don't plan to
 //!   destroy the global at all, you don't need to bother keeping the
 //!   `Global` around.
-//! - You should not remove a state value from the event loop if you have
-//!   not previously destroyed all the globals using it, otherwise you'll
-//!   quickly encounter a panic.
 
 pub mod compositor;
 pub mod output;

src/wayland/output/mod.rs

@@ -22,17 +22,17 @@
 //! use wayland_server::protocol::wl_output;
 //!
 //! # fn main() {
-//! # let (mut display, event_loop) = wayland_server::Display::new();
+//! # let mut event_loop = wayland_server::calloop::EventLoop::<()>::new().unwrap();
+//! # let mut display = wayland_server::Display::new(event_loop.handle());
 //! // Create the Output with given name and physical properties
 //! let (output, _output_global) = Output::new(
 //!     &mut display,      // the display
-//!     event_loop.token(), // the LoopToken
 //!     "output-0".into(), // the name of this output,
 //!     PhysicalProperties {
 //!         width: 200,                     // width in mm
 //!         height: 150,                    // height in mm,
 //!         subpixel: wl_output::Subpixel::HorizontalRgb,  // subpixel information
-//!         maker: "Screens Inc".into(), // manufacturer of the monitor
+//!         make: "Screens Inc".into(),     // make of the monitor
 //!         model: "Monitor Ultra".into(),  // model of the monitor
 //!     },
 //!     None // insert a logger here
@@ -53,10 +53,9 @@
 
 use std::sync::{Arc, Mutex};
 
-use wayland_server::{Display, Global, LoopToken, NewResource, Resource};
-use wayland_server::commons::{downcast_impl, Implementation};
 use wayland_server::protocol::wl_output::{Event, Mode as WMode, Request, WlOutput};
 pub use wayland_server::protocol::wl_output::{Subpixel, Transform};
+use wayland_server::{Display, Global, NewResource, Resource};
 
 /// An output mode
 ///
@@ -84,8 +83,8 @@ pub struct PhysicalProperties {
     pub height: i32,
     /// The subpixel geometry
     pub subpixel: Subpixel,
-    /// Textual representation of the manufacturer
+    /// Textual representation of the make
-    pub maker: String,
+    pub make: String,
     /// Textual representation of the model
     pub model: String,
 }
@@ -148,27 +147,13 @@ impl Inner {
             physical_width: self.physical.width,
             physical_height: self.physical.height,
             subpixel: self.physical.subpixel,
-            make: self.physical.maker.clone(),
+            make: self.physical.make.clone(),
             model: self.physical.model.clone(),
             transform: self.transform,
         });
     }
 }
 
-struct InnerWrapper {
-    inner: Arc<Mutex<Inner>>,
-}
-
-// This implementation does nothing, we just use it as a stable type to downcast the
-// implementation in the destructor of wl_output, in order to retrieve the Arc to the
-// inner and remove this output from the list
-impl Implementation<Resource<WlOutput>, Request> for InnerWrapper {
-    fn receive(&mut self, req: Request, _res: Resource<WlOutput>) {
-        // this will break if new variants are added :)
-        let Request::Release = req;
-    }
-}
-
 /// An output as seen by the clients
 ///
 /// This handle is stored in the events loop, and allows you to notify clients
@@ -185,7 +170,6 @@ impl Output {
     /// in case you whish to remove this global in  the future.
     pub fn new<L>(
         display: &mut Display,
-        token: LoopToken,
         name: String,
         physical: PhysicalProperties,
         logger: L,
@@ -210,25 +194,19 @@ impl Output {
             preferred_mode: None,
         }));
 
-        let output = Output {
+        let output = Output { inner: inner.clone() };
-            inner: inner.clone(),
-        };
 
-        let global = display.create_global(&token, 3, move |_version, new_output: NewResource<_>| {
+        let global = display.create_global(3, move |new_output: NewResource<_>, _version| {
             let output = new_output.implement(
-                InnerWrapper {
+                |req, _| {
-                    inner: inner.clone(),
+                    // this will break if new variants are added :)
+                    let Request::Release = req;
                 },
-                Some(|output, boxed_impl| {
+                Some(|output: Resource<WlOutput>| {
-                    let wrapper: Box<InnerWrapper> =
+                    let inner = output.user_data::<Arc<Mutex<Inner>>>().unwrap();
-                        downcast_impl(boxed_impl).unwrap_or_else(|_| unreachable!());
+                    inner.lock().unwrap().instances.retain(|o| !o.equals(&output));
-                    wrapper
-                        .inner
-                        .lock()
-                        .unwrap()
-                        .instances
-                        .retain(|o| !o.equals(&output));
                 }),
+                inner.clone(),
             );
             inner.lock().unwrap().new_global(output);
         });

src/wayland/seat/keyboard.rs

@@ -3,9 +3,11 @@ use std::io::{Error as IoError, Write};
 use std::os::unix::io::AsRawFd;
 use std::sync::{Arc, Mutex};
 use tempfile::tempfile;
-use wayland_server::{NewResource, Resource};
+use wayland_server::protocol::wl_keyboard::{
+    Event, KeyState as WlKeyState, KeymapFormat, Request, WlKeyboard,
+};
 use wayland_server::protocol::wl_surface::WlSurface;
-use wayland_server::protocol::wl_keyboard::{Event, KeyState as WlKeyState, KeymapFormat, Request, WlKeyboard};
+use wayland_server::{NewResource, Resource};
 use xkbcommon::xkb;
 pub use xkbcommon::xkb::{keysyms, Keysym};
 
@@ -194,15 +196,8 @@ pub(crate) fn create_keyboard_handler(
         "rules" => rules, "model" => model, "layout" => layout, "variant" => variant,
         "options" => &options
     );
-    let internal = KbdInternal::new(
+    let internal = KbdInternal::new(rules, model, layout, variant, options, repeat_rate, repeat_delay)
-        rules,
+        .map_err(|_| {
-        model,
-        layout,
-        variant,
-        options,
-        repeat_rate,
-        repeat_delay,
-    ).map_err(|_| {
             debug!(log, "Loading keymap failed");
             Error::BadKeymap
         })?;
@@ -416,7 +411,7 @@ pub(crate) fn implement_keyboard(
     let destructor = match handle {
         Some(h) => {
             let arc = h.arc.clone();
-            Some(move |keyboard: Resource<_>, _| {
+            Some(move |keyboard: Resource<_>| {
                 arc.internal
                     .lock()
                     .unwrap()
@@ -435,5 +430,6 @@ pub(crate) fn implement_keyboard(
             }
         },
         destructor,
+        (),
     )
 }

src/wayland/seat/mod.rs

@@ -13,13 +13,13 @@
 //! use smithay::wayland::seat::Seat;
 //!
 //! # fn main(){
-//! # let (mut display, event_loop) = wayland_server::Display::new();
+//! # let mut event_loop = wayland_server::calloop::EventLoop::<()>::new().unwrap();
+//! # let mut display = wayland_server::Display::new(event_loop.handle());
 //! // insert the seat:
 //! let (seat, seat_global) = Seat::new(
 //!     &mut display,    // the display
-//!     event_loop.token(), // a LoopToken
+//!     "seat-0".into(), // the name of the seat, will be advertized to clients
-//!     "seat-0".into(), // the name of the seat, will be advertize to clients
+//!     None             // insert a logger here
-//!     None /* insert a logger here*/
 //! );
 //! # }
 //! ```
@@ -40,12 +40,12 @@
 //! # use smithay::wayland::seat::Seat;
 //! #
 //! # fn main(){
-//! # let (mut display, event_loop) = wayland_server::Display::new();
+//! # let mut event_loop = wayland_server::calloop::EventLoop::<()>::new().unwrap();
+//! # let mut display = wayland_server::Display::new(event_loop.handle());
 //! # let (mut seat, seat_global) = Seat::new(
 //! #     &mut display,
-//! #     event_loop.token(),
+//! #     "seat-0".into(),
-//! #     "seat-0".into(), // the name of the seat, will be advertize to clients
+//! #     None
-//! #     None /* insert a logger here*/
 //! # );
 //! let pointer_handle = seat.add_pointer();
 //! # }
@@ -61,8 +61,8 @@ mod pointer;
 
 pub use self::keyboard::{keysyms, Error as KeyboardError, KeyboardHandle, Keysym, ModifiersState};
 pub use self::pointer::{PointerAxisHandle, PointerHandle};
-use wayland_server::{Display, Global, LoopToken, NewResource, Resource};
 use wayland_server::protocol::wl_seat;
+use wayland_server::{Display, Global, NewResource, Resource};
 
 struct Inner {
     log: ::slog::Logger,
@@ -113,12 +113,7 @@ impl Seat {
     /// You are provided with the state token to retrieve it (allowing
     /// you to add or remove capabilities from it), and the global handle,
     /// in case you want to remove it.
-    pub fn new<L>(
+    pub fn new<L>(display: &mut Display, name: String, logger: L) -> (Seat, Global<wl_seat::WlSeat>)
-        display: &mut Display,
-        token: LoopToken,
-        name: String,
-        logger: L,
-    ) -> (Seat, Global<wl_seat::WlSeat>)
     where
         L: Into<Option<::slog::Logger>>,
     {
@@ -130,10 +125,8 @@ impl Seat {
             keyboard: None,
             known_seats: Vec::new(),
         }));
-        let seat = Seat {
+        let seat = Seat { inner: inner.clone() };
-            inner: inner.clone(),
+        let global = display.create_global(5, move |new_seat, _version| {
-        };
-        let global = display.create_global(&token, 5, move |_version, new_seat| {
             let seat = implement_seat(new_seat, inner.clone());
             let mut inner = inner.lock().unwrap();
             if seat.version() >= 2 {
@@ -277,12 +270,13 @@ fn implement_seat(
                 }
             }
         },
-        Some(move |seat, _| {
+        Some(move |seat| {
             dest_inner
                 .lock()
                 .unwrap()
                 .known_seats
                 .retain(|s| !s.equals(&seat));
         }),
+        (),
     )
 }

src/wayland/seat/pointer.rs

@@ -1,7 +1,7 @@
 use std::sync::{Arc, Mutex, MutexGuard};
-use wayland_server::{NewResource, Resource};
-use wayland_server::protocol::wl_surface::WlSurface;
 use wayland_server::protocol::wl_pointer::{Axis, AxisSource, ButtonState, Event, Request, WlPointer};
+use wayland_server::protocol::wl_surface::WlSurface;
+use wayland_server::{NewResource, Resource};
 
 // TODO: handle pointer surface role
 
@@ -171,9 +171,7 @@ impl<'a> PointerAxisHandle<'a> {
     pub fn source(&mut self, source: AxisSource) -> &mut Self {
         self.inner.with_focused_pointers(|pointer, _| {
             if pointer.version() >= 5 {
-                pointer.send(Event::AxisSource {
+                pointer.send(Event::AxisSource { axis_source: source });
-                    axis_source: source,
-                });
             }
         });
         self
@@ -245,7 +243,7 @@ pub(crate) fn implement_pointer(
     let destructor = match handle {
         Some(h) => {
             let inner = h.inner.clone();
-            Some(move |pointer: Resource<_>, _| {
+            Some(move |pointer: Resource<_>| {
                 inner
                     .lock()
                     .unwrap()
@@ -267,5 +265,6 @@ pub(crate) fn implement_pointer(
             }
         },
         destructor,
+        (),
     )
 }

src/wayland/shell/legacy/mod.rs

@@ -35,7 +35,6 @@
 //! use smithay::wayland::compositor::roles::*;
 //! use smithay::wayland::compositor::CompositorToken;
 //! use smithay::wayland::shell::legacy::{wl_shell_init, ShellSurfaceRole, ShellRequest};
-//! use wayland_server::{EventLoop, LoopToken};
 //! # use wayland_server::protocol::{wl_seat, wl_output};
 //! # #[derive(Default)] struct MySurfaceData;
 //!
@@ -51,21 +50,19 @@
 //! );
 //!
 //! # fn main() {
-//! # let (mut display, event_loop) = wayland_server::Display::new();
+//! # let mut event_loop = wayland_server::calloop::EventLoop::<()>::new().unwrap();
+//! # let mut display = wayland_server::Display::new(event_loop.handle());
 //! # let (compositor_token, _, _) = smithay::wayland::compositor::compositor_init::<(), MyRoles, _, _>(
 //! #     &mut display,
-//! #     event_loop.token(),
+//! #     |_, _, _| {},
-//! #     |_, _| {},
 //! #     None
 //! # );
 //! let (shell_state, _) = wl_shell_init(
 //!     &mut display,
-//!     event_loop.token(),
 //!     // token from the compositor implementation
 //!     compositor_token,
-//!     // your implementation, can also be a strucy implementing the
+//!     // your implementation
-//!     // appropriate Implementation<(), ShellRequest<_, _, _>> trait
+//!     |event: ShellRequest<_, _, MyShellSurfaceData>| { /* ... */ },
-//!     |event: ShellRequest<_, _, MyShellSurfaceData>, ()| { /* ... */ },
 //!     None  // put a logger if you want
 //! );
 //!
@@ -73,16 +70,15 @@
 //! # }
 //! ```
 
-use std::rc::Rc;
 use std::cell::RefCell;
+use std::rc::Rc;
 use std::sync::{Arc, Mutex};
 
-use wayland::compositor::CompositorToken;
 use wayland::compositor::roles::Role;
+use wayland::compositor::CompositorToken;
 
-use wayland_server::{Display, Global, LoopToken, Resource};
-use wayland_server::commons::Implementation;
 use wayland_server::protocol::{wl_output, wl_seat, wl_shell, wl_shell_surface, wl_surface};
+use wayland_server::{Display, Global, Resource};
 
 mod wl_handlers;
 
@@ -154,8 +150,7 @@ where
             }
         });
         if let Ok(true) = ret {
-            self.shell_surface
+            self.shell_surface.send(wl_shell_surface::Event::Ping { serial });
-                .send(wl_shell_surface::Event::Ping { serial });
             Ok(())
         } else {
             Err(())
@@ -318,7 +313,6 @@ where
 /// Create a new `wl_shell` global
 pub fn wl_shell_init<U, R, D, L, Impl>(
     display: &mut Display,
-    ltoken: LoopToken,
     ctoken: CompositorToken<U, R>,
     implementation: Impl,
     logger: L,
@@ -328,23 +322,23 @@ where
     D: Default + 'static,
     R: Role<ShellSurfaceRole<D>> + 'static,
     L: Into<Option<::slog::Logger>>,
-    Impl: Implementation<(), ShellRequest<U, R, D>>,
+    Impl: FnMut(ShellRequest<U, R, D>) + 'static,
 {
     let _log = ::slog_or_stdlog(logger);
 
     let implementation = Rc::new(RefCell::new(implementation));
 
-    let ltoken2 = ltoken.clone();
+    let dtoken = display.get_token();
 
     let state = Arc::new(Mutex::new(ShellState {
         known_surfaces: Vec::new(),
     }));
     let state2 = state.clone();
 
-    let global = display.create_global(&ltoken2, 1, move |_version, shell| {
+    let global = display.create_global(1, move |shell, _version| {
         self::wl_handlers::implement_shell(
             shell,
-            ltoken.clone(),
+            dtoken.clone(),
             ctoken,
             implementation.clone(),
             state2.clone(),

src/wayland/shell/legacy/wl_handlers.rs

@@ -2,18 +2,17 @@ use std::cell::RefCell;
 use std::rc::Rc;
 use std::sync::{Arc, Mutex};
 
-use wayland_server::{LoopToken, NewResource, Resource};
-use wayland_server::commons::Implementation;
 use wayland_server::protocol::{wl_shell, wl_shell_surface, wl_surface};
+use wayland_server::{DisplayToken, NewResource, Resource};
 
-use wayland::compositor::CompositorToken;
 use wayland::compositor::roles::Role;
+use wayland::compositor::CompositorToken;
 
 use super::{ShellRequest, ShellState, ShellSurface, ShellSurfaceKind, ShellSurfaceRole};
 
 pub(crate) fn implement_shell<U, R, D, Impl>(
     shell: NewResource<wl_shell::WlShell>,
-    ltoken: LoopToken,
+    dtoken: DisplayToken,
     ctoken: CompositorToken<U, R>,
     implementation: Rc<RefCell<Impl>>,
     state: Arc<Mutex<ShellState<U, R, D>>>,
@@ -21,9 +20,9 @@ pub(crate) fn implement_shell<U, R, D, Impl>(
     U: 'static,
     D: Default + 'static,
     R: Role<ShellSurfaceRole<D>> + 'static,
-    Impl: Implementation<(), ShellRequest<U, R, D>> + 'static,
+    Impl: FnMut(ShellRequest<U, R, D>) + 'static,
 {
-    let ltoken2 = ltoken.clone();
+    let dtoken2 = dtoken.clone();
     shell.implement_nonsend(
         move |req, shell: Resource<_>| {
             let wl_shell::Request::GetShellSurface { id, surface } = req;
@@ -34,17 +33,14 @@ pub(crate) fn implement_shell<U, R, D, Impl>(
                 user_data: Default::default(),
             };
             if ctoken.give_role_with(&surface, role_data).is_err() {
-                shell.post_error(
+                shell.post_error(wl_shell::Error::Role as u32, "Surface already has a role.".into());
-                    wl_shell::Error::Role as u32,
-                    "Surface already has a role.".into(),
-                );
                 return;
             }
             let shell_surface = implement_shell_surface(
                 id,
                 surface,
                 implementation.clone(),
-                ltoken.clone(),
+                dtoken.clone(),
                 ctoken,
                 state.clone(),
             );
@@ -53,23 +49,29 @@ pub(crate) fn implement_shell<U, R, D, Impl>(
                 .unwrap()
                 .known_surfaces
                 .push(make_handle(&shell_surface, ctoken));
-            implementation.borrow_mut().receive(
+            let mut imp = implementation.borrow_mut();
-                ShellRequest::NewShellSurface {
+            (&mut *imp)(ShellRequest::NewShellSurface {
                 surface: make_handle(&shell_surface, ctoken),
+            });
         },
+        None::<fn(_)>,
         (),
-            );
+        &dtoken2,
-        },
-        None::<fn(_, _)>,
-        &ltoken2,
     );
 }
 
-fn make_handle<U, R, D>(
+fn make_handle<U, R, SD>(
     shell_surface: &Resource<wl_shell_surface::WlShellSurface>,
     token: CompositorToken<U, R>,
-) -> ShellSurface<U, R, D> {
+) -> ShellSurface<U, R, SD>
-    let data = unsafe { &*(shell_surface.get_user_data() as *mut ShellSurfaceUserData<U, R, D>) };
+where
+    U: 'static,
+    R: Role<ShellSurfaceRole<SD>> + 'static,
+    SD: 'static,
+{
+    let data = shell_surface
+        .user_data::<ShellSurfaceUserData<U, R, SD>>()
+        .unwrap();
     ShellSurface {
         wl_surface: data.surface.clone(),
         shell_surface: shell_surface.clone(),
@@ -78,29 +80,31 @@ fn make_handle<U, R, D>(
     }
 }
 
-pub(crate) struct ShellSurfaceUserData<U, R, D> {
+pub(crate) struct ShellSurfaceUserData<U, R, SD> {
     surface: Resource<wl_surface::WlSurface>,
-    state: Arc<Mutex<ShellState<U, R, D>>>,
+    state: Arc<Mutex<ShellState<U, R, SD>>>,
 }
 
-fn implement_shell_surface<U, R, Impl, D>(
+fn implement_shell_surface<U, R, Impl, SD>(
     shell_surface: NewResource<wl_shell_surface::WlShellSurface>,
     surface: Resource<wl_surface::WlSurface>,
     implementation: Rc<RefCell<Impl>>,
-    ltoken: LoopToken,
+    dtoken: DisplayToken,
     ctoken: CompositorToken<U, R>,
-    state: Arc<Mutex<ShellState<U, R, D>>>,
+    state: Arc<Mutex<ShellState<U, R, SD>>>,
 ) -> Resource<wl_shell_surface::WlShellSurface>
 where
     U: 'static,
-    D: 'static,
+    SD: 'static,
-    R: Role<ShellSurfaceRole<D>> + 'static,
+    R: Role<ShellSurfaceRole<SD>> + 'static,
-    Impl: Implementation<(), ShellRequest<U, R, D>> + 'static,
+    Impl: FnMut(ShellRequest<U, R, SD>) + 'static,
 {
     use self::wl_shell_surface::Request;
-    let shell_surface = shell_surface.implement_nonsend(
+    shell_surface.implement_nonsend(
         move |req, shell_surface: Resource<_>| {
-            let data = unsafe { &mut *(shell_surface.get_user_data() as *mut ShellSurfaceUserData<U, R, D>) };
+            let data = shell_surface
+                .user_data::<ShellSurfaceUserData<U, R, SD>>()
+                .unwrap();
             let mut user_impl = implementation.borrow_mut();
             match req {
                 Request::Pong { serial } => {
@@ -112,76 +116,48 @@ where
                             } else {
                                 false
                             }
-                        })
+                        }).expect("wl_shell_surface exists but surface has not the right role?");
-                        .expect("wl_shell_surface exists but surface has not the right role?");
                     if valid {
-                        user_impl.receive(
+                        (&mut *user_impl)(ShellRequest::Pong {
-                            ShellRequest::Pong {
                             surface: make_handle(&shell_surface, ctoken),
-                            },
+                        });
-                            (),
-                        );
                     }
                 }
-                Request::Move { seat, serial } => user_impl.receive(
+                Request::Move { seat, serial } => (&mut *user_impl)(ShellRequest::Move {
-                    ShellRequest::Move {
                     surface: make_handle(&shell_surface, ctoken),
                     serial,
                     seat,
-                    },
+                }),
-                    (),
+                Request::Resize { seat, serial, edges } => (&mut *user_impl)(ShellRequest::Resize {
-                ),
-                Request::Resize {
-                    seat,
-                    serial,
-                    edges,
-                } => user_impl.receive(
-                    ShellRequest::Resize {
                     surface: make_handle(&shell_surface, ctoken),
                     serial,
                     seat,
                     edges,
-                    },
+                }),
-                    (),
+                Request::SetToplevel => (&mut *user_impl)(ShellRequest::SetKind {
-                ),
-                Request::SetToplevel => user_impl.receive(
-                    ShellRequest::SetKind {
                     surface: make_handle(&shell_surface, ctoken),
                     kind: ShellSurfaceKind::Toplevel,
-                    },
+                }),
-                    (),
+                Request::SetTransient { parent, x, y, flags } => (&mut *user_impl)(ShellRequest::SetKind {
-                ),
-                Request::SetTransient {
-                    parent,
-                    x,
-                    y,
-                    flags,
-                } => user_impl.receive(
-                    ShellRequest::SetKind {
                     surface: make_handle(&shell_surface, ctoken),
                     kind: ShellSurfaceKind::Transient {
                         parent,
                         location: (x, y),
                         inactive: flags.contains(wl_shell_surface::Transient::Inactive),
                     },
-                    },
+                }),
-                    (),
-                ),
                 Request::SetFullscreen {
                     method,
                     framerate,
                     output,
-                } => user_impl.receive(
+                } => (&mut *user_impl)(ShellRequest::SetKind {
-                    ShellRequest::SetKind {
                     surface: make_handle(&shell_surface, ctoken),
                     kind: ShellSurfaceKind::Fullscreen {
                         method,
                         framerate,
                         output,
                     },
-                    },
+                }),
-                    (),
-                ),
                 Request::SetPopup {
                     seat,
                     serial,
@@ -189,8 +165,7 @@ where
                     x,
                     y,
                     flags,
-                } => user_impl.receive(
+                } => (&mut *user_impl)(ShellRequest::SetKind {
-                    ShellRequest::SetKind {
                     surface: make_handle(&shell_surface, ctoken),
                     kind: ShellSurfaceKind::Popup {
                         parent,
@@ -199,16 +174,11 @@ where
                         location: (x, y),
                         inactive: flags.contains(wl_shell_surface::Transient::Inactive),
                     },
-                    },
+                }),
-                    (),
+                Request::SetMaximized { output } => (&mut *user_impl)(ShellRequest::SetKind {
-                ),
-                Request::SetMaximized { output } => user_impl.receive(
-                    ShellRequest::SetKind {
                     surface: make_handle(&shell_surface, ctoken),
                     kind: ShellSurfaceKind::Maximized { output },
-                    },
+                }),
-                    (),
-                ),
                 Request::SetTitle { title } => {
                     ctoken
                         .with_role_data(&data.surface, |data| data.title = title)
@@ -221,13 +191,13 @@ where
                 }
             }
         },
-        Some(|shell_surface: Resource<_>, _| {
+        Some(|shell_surface: Resource<_>| {
-            let data =
+            let data = shell_surface
-                unsafe { Box::from_raw(shell_surface.get_user_data() as *mut ShellSurfaceUserData<U, R, D>) };
+                .user_data::<ShellSurfaceUserData<U, R, SD>>()
+                .unwrap();
             data.state.lock().unwrap().cleanup_surfaces();
         }),
-        &ltoken,
+        ShellSurfaceUserData { surface, state },
-    );
+        &dtoken,
-    shell_surface.set_user_data(Box::into_raw(Box::new(ShellSurfaceUserData { surface, state })) as *mut ());
+    )
-    shell_surface
 }

src/wayland/shell/xdg/mod.rs

@@ -34,7 +34,6 @@
 //! use smithay::wayland::compositor::CompositorToken;
 //! use smithay::wayland::shell::xdg::{xdg_shell_init, XdgSurfaceRole, XdgRequest};
 //! use wayland_protocols::unstable::xdg_shell::v6::server::zxdg_shell_v6::ZxdgShellV6;
-//! use wayland_server::{EventLoop, LoopToken};
 //! # use wayland_server::protocol::{wl_seat, wl_output};
 //! # #[derive(Default)] struct MySurfaceData;
 //!
@@ -50,21 +49,19 @@
 //! }
 //!
 //! # fn main() {
-//! # let (mut display, event_loop) = wayland_server::Display::new();
+//! # let mut event_loop = wayland_server::calloop::EventLoop::<()>::new().unwrap();
+//! # let mut display = wayland_server::Display::new(event_loop.handle());
 //! # let (compositor_token, _, _) = smithay::wayland::compositor::compositor_init::<(), MyRoles, _, _>(
 //! #     &mut display,
-//! #     event_loop.token(),
+//! #     |_, _, _| {},
-//! #     |_, _| {},
 //! #     None
 //! # );
 //! let (shell_state, _, _) = xdg_shell_init(
 //!     &mut display,
-//!     event_loop.token(),
 //!     // token from the compositor implementation
 //!     compositor_token,
-//!     // your implementation, can also be a strucy implementing the
+//!     // your implementation
-//!     // appropriate Implementation<(), XdgRequest<_, _, _>> trait
+//!     |event: XdgRequest<_, _, MyShellData>| { /* ... */ },
-//!     |event: XdgRequest<_, _, MyShellData>, ()| { /* ... */ },
 //!     None  // put a logger if you want
 //! );
 //!
@@ -92,14 +89,16 @@ use std::cell::RefCell;
 use std::rc::Rc;
 use std::sync::{Arc, Mutex};
 use utils::Rectangle;
-use wayland::compositor::CompositorToken;
 use wayland::compositor::roles::Role;
-use wayland_protocols::xdg_shell::server::{xdg_popup, xdg_positioner, xdg_surface, xdg_toplevel, xdg_wm_base};
+use wayland::compositor::CompositorToken;
-use wayland_protocols::unstable::xdg_shell::v6::server::{zxdg_popup_v6, zxdg_shell_v6, zxdg_surface_v6,
+use wayland_protocols::unstable::xdg_shell::v6::server::{
-                                                         zxdg_toplevel_v6};
+    zxdg_popup_v6, zxdg_shell_v6, zxdg_surface_v6, zxdg_toplevel_v6,
-use wayland_server::{Display, Global, LoopToken, Resource};
+};
-use wayland_server::commons::Implementation;
+use wayland_protocols::xdg_shell::server::{
+    xdg_popup, xdg_positioner, xdg_surface, xdg_toplevel, xdg_wm_base,
+};
 use wayland_server::protocol::{wl_output, wl_seat, wl_surface};
+use wayland_server::{Display, DisplayToken, Global, Resource};
 
 // handlers for the xdg_shell protocol
 mod xdg_handlers;
@@ -254,20 +253,20 @@ impl Default for XdgSurfacePendingState {
     }
 }
 
-pub(crate) struct ShellImplementation<U, R, SD> {
+pub(crate) struct ShellData<U, R, SD> {
     log: ::slog::Logger,
     compositor_token: CompositorToken<U, R>,
-    loop_token: LoopToken,
+    display_token: DisplayToken,
-    user_impl: Rc<RefCell<Implementation<(), XdgRequest<U, R, SD>>>>,
+    user_impl: Rc<RefCell<FnMut(XdgRequest<U, R, SD>)>>,
     shell_state: Arc<Mutex<ShellState<U, R, SD>>>,
 }
 
-impl<U, R, SD> Clone for ShellImplementation<U, R, SD> {
+impl<U, R, SD> Clone for ShellData<U, R, SD> {
     fn clone(&self) -> Self {
-        ShellImplementation {
+        ShellData {
             log: self.log.clone(),
             compositor_token: self.compositor_token,
-            loop_token: self.loop_token.clone(),
+            display_token: self.display_token.clone(),
             user_impl: self.user_impl.clone(),
             shell_state: self.shell_state.clone(),
         }
@@ -277,7 +276,6 @@ impl<U, R, SD> Clone for ShellImplementation<U, R, SD> {
 /// Create a new `xdg_shell` globals
 pub fn xdg_shell_init<U, R, SD, L, Impl>(
     display: &mut Display,
-    ltoken: LoopToken,
     ctoken: CompositorToken<U, R>,
     implementation: Impl,
     logger: L,
@@ -291,7 +289,7 @@ where
     R: Role<XdgSurfaceRole> + 'static,
     SD: Default + 'static,
     L: Into<Option<::slog::Logger>>,
-    Impl: Implementation<(), XdgRequest<U, R, SD>>,
+    Impl: FnMut(XdgRequest<U, R, SD>) + 'static,
 {
     let log = ::slog_or_stdlog(logger);
     let shell_state = Arc::new(Mutex::new(ShellState {
@@ -299,22 +297,22 @@ where
         known_popups: Vec::new(),
     }));
 
-    let shell_impl = ShellImplementation {
+    let shell_data = ShellData {
         log: log.new(o!("smithay_module" => "xdg_shell_handler")),
-        loop_token: ltoken.clone(),
+        display_token: display.get_token(),
         compositor_token: ctoken,
         user_impl: Rc::new(RefCell::new(implementation)),
         shell_state: shell_state.clone(),
     };
 
-    let shell_impl_z = shell_impl.clone();
+    let shell_data_z = shell_data.clone();
 
-    let xdg_shell_global = display.create_global(&ltoken, 1, move |_version, shell| {
+    let xdg_shell_global = display.create_global(1, move |shell, _version| {
-        self::xdg_handlers::implement_wm_base(shell, &shell_impl);
+        self::xdg_handlers::implement_wm_base(shell, &shell_data);
     });
 
-    let zxdgv6_shell_global = display.create_global(&ltoken, 1, move |_version, shell| {
+    let zxdgv6_shell_global = display.create_global(1, move |shell, _version| {
-        self::zxdgv6_handlers::implement_shell(shell, &shell_impl_z);
+        self::zxdgv6_handlers::implement_shell(shell, &shell_data_z);
     });
 
     (shell_state, xdg_shell_global, zxdgv6_shell_global)
@@ -377,12 +375,18 @@ fn make_shell_client_data<SD: Default>() -> ShellClientData<SD> {
 ///
 /// You can use this handle to access a storage for any
 /// client-specific data you wish to associate with it.
-pub struct ShellClient<SD> {
+pub struct ShellClient<U, R, SD> {
     kind: ShellClientKind,
+    _token: CompositorToken<U, R>,
     _data: ::std::marker::PhantomData<*mut SD>,
 }
 
-impl<SD> ShellClient<SD> {
+impl<U, R, SD> ShellClient<U, R, SD>
+where
+    U: 'static,
+    R: Role<XdgSurfaceRole> + 'static,
+    SD: 'static,
+{
     /// Is the shell client represented by this handle still connected?
     pub fn alive(&self) -> bool {
         match self.kind {
@@ -416,9 +420,10 @@ impl<SD> ShellClient<SD> {
         }
         match self.kind {
             ShellClientKind::Xdg(ref shell) => {
-                let mutex =
+                let user_data = shell
-                    unsafe { &*(shell.get_user_data() as *mut self::xdg_handlers::ShellUserData<SD>) };
+                    .user_data::<self::xdg_handlers::ShellUserData<U, R, SD>>()
-                let mut guard = mutex.lock().unwrap();
+                    .unwrap();
+                let mut guard = user_data.client_data.lock().unwrap();
                 if guard.pending_ping == 0 {
                     return Err(());
                 }
@@ -426,9 +431,10 @@ impl<SD> ShellClient<SD> {
                 shell.send(xdg_wm_base::Event::Ping { serial });
             }
             ShellClientKind::ZxdgV6(ref shell) => {
-                let mutex =
+                let user_data = shell
-                    unsafe { &*(shell.get_user_data() as *mut self::zxdgv6_handlers::ShellUserData<SD>) };
+                    .user_data::<self::zxdgv6_handlers::ShellUserData<U, R, SD>>()
-                let mut guard = mutex.lock().unwrap();
+                    .unwrap();
+                let mut guard = user_data.client_data.lock().unwrap();
                 if guard.pending_ping == 0 {
                     return Err(());
                 }
@@ -449,15 +455,17 @@ impl<SD> ShellClient<SD> {
         }
         match self.kind {
             ShellClientKind::Xdg(ref shell) => {
-                let mutex =
+                let data = shell
-                    unsafe { &*(shell.get_user_data() as *mut self::xdg_handlers::ShellUserData<SD>) };
+                    .user_data::<self::xdg_handlers::ShellUserData<U, R, SD>>()
-                let mut guard = mutex.lock().unwrap();
+                    .unwrap();
+                let mut guard = data.client_data.lock().unwrap();
                 Ok(f(&mut guard.data))
             }
             ShellClientKind::ZxdgV6(ref shell) => {
-                let mutex =
+                let data = shell
-                    unsafe { &*(shell.get_user_data() as *mut self::zxdgv6_handlers::ShellUserData<SD>) };
+                    .user_data::<self::zxdgv6_handlers::ShellUserData<U, R, SD>>()
-                let mut guard = mutex.lock().unwrap();
+                    .unwrap();
+                let mut guard = data.client_data.lock().unwrap();
                 Ok(f(&mut guard.data))
             }
         }
@@ -500,26 +508,29 @@ where
     /// Retrieve the shell client owning this toplevel surface
     ///
     /// Returns `None` if the surface does actually no longer exist.
-    pub fn client(&self) -> Option<ShellClient<SD>> {
+    pub fn client(&self) -> Option<ShellClient<U, R, SD>> {
         if !self.alive() {
             return None;
         }
 
         let shell = match self.shell_surface {
             ToplevelKind::Xdg(ref s) => {
-                let &(_, ref shell, _) =
+                let data = s
-                    unsafe { &*(s.get_user_data() as *mut self::xdg_handlers::ShellSurfaceUserData) };
+                    .user_data::<self::xdg_handlers::ShellSurfaceUserData<U, R, SD>>()
-                ShellClientKind::Xdg(shell.clone())
+                    .unwrap();
+                ShellClientKind::Xdg(data.wm_base.clone())
             }
             ToplevelKind::ZxdgV6(ref s) => {
-                let &(_, ref shell, _) =
+                let data = s
-                    unsafe { &*(s.get_user_data() as *mut self::zxdgv6_handlers::ShellSurfaceUserData) };
+                    .user_data::<self::zxdgv6_handlers::ShellSurfaceUserData<U, R, SD>>()
-                ShellClientKind::ZxdgV6(shell.clone())
+                    .unwrap();
+                ShellClientKind::ZxdgV6(data.shell.clone())
             }
         };
 
         Some(ShellClient {
             kind: shell,
+            _token: self.token,
             _data: ::std::marker::PhantomData,
         })
     }
@@ -532,8 +543,8 @@ where
             return;
         }
         match self.shell_surface {
-            ToplevelKind::Xdg(ref s) => self::xdg_handlers::send_toplevel_configure(self.token, s, cfg),
+            ToplevelKind::Xdg(ref s) => self::xdg_handlers::send_toplevel_configure::<U, R, SD>(s, cfg),
-            ToplevelKind::ZxdgV6(ref s) => self::zxdgv6_handlers::send_toplevel_configure(self.token, s, cfg),
+            ToplevelKind::ZxdgV6(ref s) => self::zxdgv6_handlers::send_toplevel_configure::<U, R, SD>(s, cfg),
         }
     }
 
@@ -549,25 +560,26 @@ where
         if !self.alive() {
             return false;
         }
-        let configured = self.token
+        let configured = self
+            .token
             .with_role_data::<XdgSurfaceRole, _, _>(&self.wl_surface, |data| data.configured)
             .expect("A shell surface object exists but the surface does not have the shell_surface role ?!");
         if !configured {
             match self.shell_surface {
                 ToplevelKind::Xdg(ref s) => {
-                    let ptr = s.get_user_data();
+                    let data = s
-                    let &(_, _, ref xdg_surface) =
+                        .user_data::<self::xdg_handlers::ShellSurfaceUserData<U, R, SD>>()
-                        unsafe { &*(ptr as *mut self::xdg_handlers::ShellSurfaceUserData) };
+                        .unwrap();
-                    xdg_surface.post_error(
+                    data.xdg_surface.post_error(
                         xdg_surface::Error::NotConstructed as u32,
                         "Surface has not been configured yet.".into(),
                     );
                 }
                 ToplevelKind::ZxdgV6(ref s) => {
-                    let ptr = s.get_user_data();
+                    let data = s
-                    let &(_, _, ref xdg_surface) =
+                        .user_data::<self::zxdgv6_handlers::ShellSurfaceUserData<U, R, SD>>()
-                        unsafe { &*(ptr as *mut self::zxdgv6_handlers::ShellSurfaceUserData) };
+                        .unwrap();
-                    xdg_surface.post_error(
+                    data.xdg_surface.post_error(
                         zxdg_surface_v6::Error::NotConstructed as u32,
                         "Surface has not been configured yet.".into(),
                     );
@@ -607,8 +619,7 @@ where
             .with_role_data::<XdgSurfaceRole, _, _>(&self.wl_surface, |data| match data.pending_state {
                 XdgSurfacePendingState::Toplevel(ref state) => Some(state.clone()),
                 _ => None,
-            })
+            }).ok()
-            .ok()
             .and_then(|x| x)
     }
 }
@@ -652,26 +663,29 @@ where
     /// Retrieve the shell client owning this popup surface
     ///
     /// Returns `None` if the surface does actually no longer exist.
-    pub fn client(&self) -> Option<ShellClient<SD>> {
+    pub fn client(&self) -> Option<ShellClient<U, R, SD>> {
         if !self.alive() {
             return None;
         }
 
         let shell = match self.shell_surface {
             PopupKind::Xdg(ref p) => {
-                let &(_, ref shell, _) =
+                let data = p
-                    unsafe { &*(p.get_user_data() as *mut self::xdg_handlers::ShellSurfaceUserData) };
+                    .user_data::<self::xdg_handlers::ShellSurfaceUserData<U, R, SD>>()
-                ShellClientKind::Xdg(shell.clone())
+                    .unwrap();
+                ShellClientKind::Xdg(data.wm_base.clone())
             }
             PopupKind::ZxdgV6(ref p) => {
-                let &(_, ref shell, _) =
+                let data = p
-                    unsafe { &*(p.get_user_data() as *mut self::zxdgv6_handlers::ShellSurfaceUserData) };
+                    .user_data::<self::zxdgv6_handlers::ShellSurfaceUserData<U, R, SD>>()
-                ShellClientKind::ZxdgV6(shell.clone())
+                    .unwrap();
+                ShellClientKind::ZxdgV6(data.shell.clone())
             }
         };
 
         Some(ShellClient {
             kind: shell,
+            _token: self.token,
             _data: ::std::marker::PhantomData,
         })
     }
@@ -685,10 +699,10 @@ where
         }
         match self.shell_surface {
             PopupKind::Xdg(ref p) => {
-                self::xdg_handlers::send_popup_configure(self.token, p, cfg);
+                self::xdg_handlers::send_popup_configure::<U, R, SD>(p, cfg);
             }
             PopupKind::ZxdgV6(ref p) => {
-                self::zxdgv6_handlers::send_popup_configure(self.token, p, cfg);
+                self::zxdgv6_handlers::send_popup_configure::<U, R, SD>(p, cfg);
             }
         }
     }
@@ -705,25 +719,26 @@ where
         if !self.alive() {
             return false;
         }
-        let configured = self.token
+        let configured = self
+            .token
             .with_role_data::<XdgSurfaceRole, _, _>(&self.wl_surface, |data| data.configured)
             .expect("A shell surface object exists but the surface does not have the shell_surface role ?!");
         if !configured {
             match self.shell_surface {
                 PopupKind::Xdg(ref s) => {
-                    let ptr = s.get_user_data();
+                    let data = s
-                    let &(_, _, ref xdg_surface) =
+                        .user_data::<self::xdg_handlers::ShellSurfaceUserData<U, R, SD>>()
-                        unsafe { &*(ptr as *mut self::xdg_handlers::ShellSurfaceUserData) };
+                        .unwrap();
-                    xdg_surface.post_error(
+                    data.xdg_surface.post_error(
                         xdg_surface::Error::NotConstructed as u32,
                         "Surface has not been confgured yet.".into(),
                     );
                 }
                 PopupKind::ZxdgV6(ref s) => {
-                    let ptr = s.get_user_data();
+                    let data = s
-                    let &(_, _, ref xdg_surface) =
+                        .user_data::<self::zxdgv6_handlers::ShellSurfaceUserData<U, R, SD>>()
-                        unsafe { &*(ptr as *mut self::zxdgv6_handlers::ShellSurfaceUserData) };
+                        .unwrap();
-                    xdg_surface.post_error(
+                    data.xdg_surface.post_error(
                         zxdg_surface_v6::Error::NotConstructed as u32,
                         "Surface has not been confgured yet.".into(),
                     );
@@ -766,8 +781,7 @@ where
             .with_role_data::<XdgSurfaceRole, _, _>(&self.wl_surface, |data| match data.pending_state {
                 XdgSurfacePendingState::Popup(ref state) => Some(state.clone()),
                 _ => None,
-            })
+            }).ok()
-            .ok()
             .and_then(|x| x)
     }
 }
@@ -814,7 +828,7 @@ pub enum XdgRequest<U, R, SD> {
     /// A new shell client was instanciated
     NewClient {
         /// the client
-        client: ShellClient<SD>,
+        client: ShellClient<U, R, SD>,
     },
     /// The pong for a pending ping of this shell client was received
     ///
@@ -822,7 +836,7 @@ pub enum XdgRequest<U, R, SD> {
     /// from the pending ping.
     ClientPong {
         /// the client
-        client: ShellClient<SD>,
+        client: ShellClient<U, R, SD>,
     },
     /// A new toplevel surface was created
     ///

src/wayland/shell/xdg/xdg_handlers.rs

@@ -1,18 +1,25 @@
-use super::{make_shell_client_data, PopupConfigure, PopupKind, PopupState, PositionerState, ShellClient,
+use std::cell::RefCell;
-            ShellClientData, ShellImplementation, ToplevelConfigure, ToplevelKind, ToplevelState,
-            XdgRequest, XdgSurfacePendingState, XdgSurfaceRole};
 use std::sync::Mutex;
-use utils::Rectangle;
+
-use wayland::compositor::CompositorToken;
 use wayland::compositor::roles::*;
-use wayland_protocols::xdg_shell::server::{xdg_popup, xdg_positioner, xdg_surface, xdg_toplevel, xdg_wm_base};
+use wayland::compositor::CompositorToken;
-use wayland_server::{LoopToken, NewResource, Resource};
+use wayland_protocols::xdg_shell::server::{
-use wayland_server::commons::{downcast_impl, Implementation};
+    xdg_popup, xdg_positioner, xdg_surface, xdg_toplevel, xdg_wm_base,
+};
 use wayland_server::protocol::wl_surface;
+use wayland_server::{DisplayToken, NewResource, Resource};
+
+use utils::Rectangle;
+
+use super::{
+    make_shell_client_data, PopupConfigure, PopupKind, PopupState, PositionerState, ShellClient,
+    ShellClientData, ShellData, ToplevelConfigure, ToplevelKind, ToplevelState, XdgRequest,
+    XdgSurfacePendingState, XdgSurfaceRole,
+};
 
 pub(crate) fn implement_wm_base<U, R, SD>(
     shell: NewResource<xdg_wm_base::XdgWmBase>,
-    implem: &ShellImplementation<U, R, SD>,
+    shell_data: &ShellData<U, R, SD>,
 ) -> Resource<xdg_wm_base::XdgWmBase>
 where
     U: 'static,
@@ -20,18 +27,18 @@ where
     SD: Default + 'static,
 {
     let shell = shell.implement_nonsend(
-        implem.clone(),
+        wm_implementation::<U, R, SD>,
-        Some(|shell, _| destroy_shell::<SD>(&shell)),
+        None::<fn(_)>,
-        &implem.loop_token,
+        ShellUserData {
-    );
+            shell_data: shell_data.clone(),
-    shell.set_user_data(Box::into_raw(Box::new(Mutex::new(make_shell_client_data::<SD>()))) as *mut _);
+            client_data: Mutex::new(make_shell_client_data::<SD>()),
-    let mut user_impl = implem.user_impl.borrow_mut();
-    user_impl.receive(
-        XdgRequest::NewClient {
-            client: make_shell_client(&shell),
         },
-        (),
+        &shell_data.display_token,
     );
+    let mut user_impl = shell_data.user_impl.borrow_mut();
+    (&mut *user_impl)(XdgRequest::NewClient {
+        client: make_shell_client(&shell, shell_data.compositor_token),
+    });
     shell
 }
 
@@ -39,37 +46,35 @@ where
  * xdg_shell
  */
 
-pub(crate) type ShellUserData<SD> = Mutex<ShellClientData<SD>>;
+pub(crate) struct ShellUserData<U, R, SD> {
-
+    shell_data: ShellData<U, R, SD>,
-fn destroy_shell<SD>(shell: &Resource<xdg_wm_base::XdgWmBase>) {
+    pub(crate) client_data: Mutex<ShellClientData<SD>>,
-    let ptr = shell.get_user_data();
-    shell.set_user_data(::std::ptr::null_mut());
-    let data = unsafe { Box::from_raw(ptr as *mut ShellUserData<SD>) };
-    // explicit call to drop to not forget what we're doing here
-    ::std::mem::drop(data);
 }
 
-pub(crate) fn make_shell_client<SD>(resource: &Resource<xdg_wm_base::XdgWmBase>) -> ShellClient<SD> {
+pub(crate) fn make_shell_client<U, R, SD>(
+    resource: &Resource<xdg_wm_base::XdgWmBase>,
+    token: CompositorToken<U, R>,
+) -> ShellClient<U, R, SD> {
     ShellClient {
         kind: super::ShellClientKind::Xdg(resource.clone()),
+        _token: token,
         _data: ::std::marker::PhantomData,
     }
 }
 
-impl<U, R, SD> Implementation<Resource<xdg_wm_base::XdgWmBase>, xdg_wm_base::Request>
+fn wm_implementation<U, R, SD>(request: xdg_wm_base::Request, shell: Resource<xdg_wm_base::XdgWmBase>)
-    for ShellImplementation<U, R, SD>
 where
     U: 'static,
     R: Role<XdgSurfaceRole> + 'static,
     SD: 'static,
 {
-    fn receive(&mut self, request: xdg_wm_base::Request, shell: Resource<xdg_wm_base::XdgWmBase>) {
+    let data = shell.user_data::<ShellUserData<U, R, SD>>().unwrap();
     match request {
         xdg_wm_base::Request::Destroy => {
             // all is handled by destructor
         }
         xdg_wm_base::Request::CreatePositioner { id } => {
-                implement_positioner(id, &self.loop_token);
+            implement_positioner(id, &data.shell_data.display_token);
         }
         xdg_wm_base::Request::GetXdgSurface { id, surface } => {
             let role_data = XdgSurfaceRole {
@@ -78,7 +83,9 @@ where
                 pending_configures: Vec::new(),
                 configured: false,
             };
-                if self.compositor_token
+            if data
+                .shell_data
+                .compositor_token
                 .give_role_with(&surface, role_data)
                 .is_err()
             {
@@ -88,18 +95,20 @@ where
                 );
                 return;
             }
-                let xdg_surface = id.implement_nonsend(
+            id.implement_nonsend(
-                    self.clone(),
+                xdg_surface_implementation::<U, R, SD>,
                 Some(destroy_surface::<U, R, SD>),
-                    &self.loop_token,
+                XdgSurfaceUserData {
+                    shell_data: data.shell_data.clone(),
+                    wl_surface: surface,
+                    wm_base: shell.clone(),
+                },
+                &data.shell_data.display_token,
             );
-                xdg_surface
-                    .set_user_data(Box::into_raw(Box::new((surface.clone(), shell.clone()))) as *mut _);
         }
         xdg_wm_base::Request::Pong { serial } => {
             let valid = {
-                    let mutex = unsafe { &*(shell.get_user_data() as *mut ShellUserData<SD>) };
+                let mut guard = data.client_data.lock().unwrap();
-                    let mut guard = mutex.lock().unwrap();
                 if guard.pending_ping == serial {
                     guard.pending_ping = 0;
                     true
@@ -108,14 +117,10 @@ where
                 }
             };
             if valid {
-                    let mut user_impl = self.user_impl.borrow_mut();
+                let mut user_impl = data.shell_data.user_impl.borrow_mut();
-                    user_impl.receive(
+                (&mut *user_impl)(XdgRequest::ClientPong {
-                        XdgRequest::ClientPong {
+                    client: make_shell_client(&shell, data.shell_data.compositor_token),
-                            client: make_shell_client(&shell),
+                });
-                        },
-                        (),
-                    );
-                }
             }
         }
     }
@@ -125,23 +130,14 @@ where
  * xdg_positioner
  */
 
-fn destroy_positioner(positioner: &Resource<xdg_positioner::XdgPositioner>) {
-    let ptr = positioner.get_user_data();
-    positioner.set_user_data(::std::ptr::null_mut());
-    // drop the PositionerState
-    let surface = unsafe { Box::from_raw(ptr as *mut PositionerState) };
-    // explicit call to drop to not forget what we're doing here
-    ::std::mem::drop(surface);
-}
-
 fn implement_positioner(
     positioner: NewResource<xdg_positioner::XdgPositioner>,
-    token: &LoopToken,
+    token: &DisplayToken,
 ) -> Resource<xdg_positioner::XdgPositioner> {
-    let positioner = positioner.implement_nonsend(
+    positioner.implement_nonsend(
         |request, positioner: Resource<_>| {
-            let ptr = positioner.get_user_data();
+            let mutex = positioner.user_data::<RefCell<PositionerState>>().unwrap();
-            let state = unsafe { &mut *(ptr as *mut PositionerState) };
+            let mut state = mutex.borrow_mut();
             match request {
                 xdg_positioner::Request::Destroy => {
                     // handled by destructor
@@ -156,24 +152,14 @@ fn implement_positioner(
                         state.rect_size = (width, height);
                     }
                 }
-                xdg_positioner::Request::SetAnchorRect {
+                xdg_positioner::Request::SetAnchorRect { x, y, width, height } => {
-                    x,
-                    y,
-                    width,
-                    height,
-                } => {
                     if width < 1 || height < 1 {
                         positioner.post_error(
                             xdg_positioner::Error::InvalidInput as u32,
                             "Invalid size for positioner's anchor rectangle.".into(),
                         );
                     } else {
-                        state.anchor_rect = Rectangle {
+                        state.anchor_rect = Rectangle { x, y, width, height };
-                            x,
-                            y,
-                            width,
-                            height,
-                        };
                     }
                 }
                 xdg_positioner::Request::SetAnchor { anchor } => {
@@ -194,74 +180,66 @@ fn implement_positioner(
                 }
             }
         },
-        Some(|positioner, _| destroy_positioner(&positioner)),
+        None::<fn(_)>,
+        RefCell::new(PositionerState::new()),
         token,
-    );
+    )
-    let data = PositionerState::new();
-    positioner.set_user_data(Box::into_raw(Box::new(data)) as *mut _);
-    positioner
 }
 
 /*
  * xdg_surface
  */
 
-type XdgSurfaceUserData = (
+struct XdgSurfaceUserData<U, R, SD> {
-    Resource<wl_surface::WlSurface>,
+    shell_data: ShellData<U, R, SD>,
-    Resource<xdg_wm_base::XdgWmBase>,
+    wl_surface: Resource<wl_surface::WlSurface>,
-);
+    wm_base: Resource<xdg_wm_base::XdgWmBase>,
-
-fn destroy_surface<U, R, SD>(
-    surface: Resource<xdg_surface::XdgSurface>,
-    implem: Box<Implementation<Resource<xdg_surface::XdgSurface>, xdg_surface::Request>>,
-) where
-    U: 'static,
-    R: Role<XdgSurfaceRole> + 'static,
-    SD: 'static,
-{
-    let implem: ShellImplementation<U, R, SD> = *downcast_impl(implem).unwrap_or_else(|_| unreachable!());
-    let ptr = surface.get_user_data();
-    surface.set_user_data(::std::ptr::null_mut());
-    // take back ownership of the userdata
-    let data = unsafe { Box::from_raw(ptr as *mut XdgSurfaceUserData) };
-    if !data.0.is_alive() {
-        // the wl_surface is destroyed, this means the client is not
-        // trying to change the role but it's a cleanup (possibly a
-        // disconnecting client), ignore the protocol check.
-        return;
-    }
-    implem
-        .compositor_token
-        .with_role_data::<XdgSurfaceRole, _, _>(&data.0, |rdata| {
-            if let XdgSurfacePendingState::None = rdata.pending_state {
-                // all is good
-            } else {
-                data.1.post_error(
-                    xdg_wm_base::Error::Role as u32,
-                    "xdg_surface was destroyed before its role object".into(),
-                );
-            }
-        })
-        .expect("xdg_surface exists but surface has not shell_surface role?!");
 }
 
-impl<U, R, SD> Implementation<Resource<xdg_surface::XdgSurface>, xdg_surface::Request>
+fn destroy_surface<U, R, SD>(surface: Resource<xdg_surface::XdgSurface>)
-    for ShellImplementation<U, R, SD>
 where
     U: 'static,
     R: Role<XdgSurfaceRole> + 'static,
     SD: 'static,
 {
-    fn receive(&mut self, request: xdg_surface::Request, xdg_surface: Resource<xdg_surface::XdgSurface>) {
+    let data = surface.user_data::<XdgSurfaceUserData<U, R, SD>>().unwrap();
-        let ptr = xdg_surface.get_user_data();
+    if !data.wl_surface.is_alive() {
-        let &(ref surface, ref shell) = unsafe { &*(ptr as *mut XdgSurfaceUserData) };
+        // the wl_surface is destroyed, this means the client is not
+        // trying to change the role but it's a cleanup (possibly a
+        // disconnecting client), ignore the protocol check.
+        return;
+    }
+    data.shell_data
+        .compositor_token
+        .with_role_data::<XdgSurfaceRole, _, _>(&data.wl_surface, |rdata| {
+            if let XdgSurfacePendingState::None = rdata.pending_state {
+                // all is good
+            } else {
+                data.wm_base.post_error(
+                    xdg_wm_base::Error::Role as u32,
+                    "xdg_surface was destroyed before its role object".into(),
+                );
+            }
+        }).expect("xdg_surface exists but surface has not shell_surface role?!");
+}
+
+fn xdg_surface_implementation<U, R, SD>(
+    request: xdg_surface::Request,
+    xdg_surface: Resource<xdg_surface::XdgSurface>,
+) where
+    U: 'static,
+    R: Role<XdgSurfaceRole> + 'static,
+    SD: 'static,
+{
+    let data = xdg_surface.user_data::<XdgSurfaceUserData<U, R, SD>>().unwrap();
     match request {
         xdg_surface::Request::Destroy => {
             // all is handled by our destructor
         }
         xdg_surface::Request::GetToplevel { id } => {
-                self.compositor_token
+            data.shell_data
-                    .with_role_data::<XdgSurfaceRole, _, _>(surface, |data| {
+                .compositor_token
+                .with_role_data::<XdgSurfaceRole, _, _>(&data.wl_surface, |data| {
                     data.pending_state = XdgSurfacePendingState::Toplevel(ToplevelState {
                         parent: None,
                         title: String::new(),
@@ -269,92 +247,85 @@ where
                         min_size: (0, 0),
                         max_size: (0, 0),
                     });
-                    })
+                }).expect("xdg_surface exists but surface has not shell_surface role?!");
-                    .expect("xdg_surface exists but surface has not shell_surface role?!");
             let toplevel = id.implement_nonsend(
-                    self.clone(),
+                toplevel_implementation::<U, R, SD>,
                 Some(destroy_toplevel::<U, R, SD>),
-                    &self.loop_token,
+                ShellSurfaceUserData {
+                    shell_data: data.shell_data.clone(),
+                    wl_surface: data.wl_surface.clone(),
+                    xdg_surface: xdg_surface.clone(),
+                    wm_base: data.wm_base.clone(),
+                },
+                &data.shell_data.display_token,
             );
-                toplevel.set_user_data(Box::into_raw(Box::new((
-                    surface.clone(),
-                    shell.clone(),
-                    xdg_surface.clone(),
-                ))) as *mut _);
 
-                self.shell_state
+            data.shell_data
+                .shell_state
                 .lock()
                 .unwrap()
                 .known_toplevels
-                    .push(make_toplevel_handle(self.compositor_token, &toplevel));
+                .push(make_toplevel_handle(&toplevel));
 
-                let handle = make_toplevel_handle(self.compositor_token, &toplevel);
+            let handle = make_toplevel_handle(&toplevel);
-                let mut user_impl = self.user_impl.borrow_mut();
+            let mut user_impl = data.shell_data.user_impl.borrow_mut();
-                user_impl.receive(XdgRequest::NewToplevel { surface: handle }, ());
+            (&mut *user_impl)(XdgRequest::NewToplevel { surface: handle });
         }
         xdg_surface::Request::GetPopup {
             id,
             parent,
             positioner,
         } => {
-                let positioner_data = unsafe { &*(positioner.get_user_data() as *const PositionerState) };
+            let positioner_data = positioner.user_data::<RefCell<PositionerState>>().unwrap();
 
             let parent_surface = parent.map(|parent| {
-                    let parent_ptr = parent.get_user_data();
+                let parent_data = parent.user_data::<XdgSurfaceUserData<U, R, SD>>().unwrap();
-                    let &(ref parent_surface, _) = unsafe { &*(parent_ptr as *mut XdgSurfaceUserData) };
+                parent_data.wl_surface.clone()
-                    parent_surface.clone()
             });
-                self.compositor_token
+            data.shell_data
-                    .with_role_data::<XdgSurfaceRole, _, _>(surface, |data| {
+                .compositor_token
+                .with_role_data::<XdgSurfaceRole, _, _>(&data.wl_surface, |data| {
                     data.pending_state = XdgSurfacePendingState::Popup(PopupState {
                         parent: parent_surface,
-                            positioner: positioner_data.clone(),
+                        positioner: positioner_data.borrow().clone(),
                     });
-                    })
+                }).expect("xdg_surface exists but surface has not shell_surface role?!");
-                    .expect("xdg_surface exists but surface has not shell_surface role?!");
             let popup = id.implement_nonsend(
-                    self.clone(),
+                xg_popup_implementation::<U, R, SD>,
                 Some(destroy_popup::<U, R, SD>),
-                    &self.loop_token,
+                ShellSurfaceUserData {
+                    shell_data: data.shell_data.clone(),
+                    wl_surface: data.wl_surface.clone(),
+                    xdg_surface: xdg_surface.clone(),
+                    wm_base: data.wm_base.clone(),
+                },
+                &data.shell_data.display_token,
             );
-                popup.set_user_data(Box::into_raw(Box::new((
-                    surface.clone(),
-                    shell.clone(),
-                    xdg_surface.clone(),
-                ))) as *mut _);
 
-                self.shell_state
+            data.shell_data
+                .shell_state
                 .lock()
                 .unwrap()
                 .known_popups
-                    .push(make_popup_handle(self.compositor_token, &popup));
+                .push(make_popup_handle(&popup));
 
-                let handle = make_popup_handle(self.compositor_token, &popup);
+            let handle = make_popup_handle(&popup);
-                let mut user_impl = self.user_impl.borrow_mut();
+            let mut user_impl = data.shell_data.user_impl.borrow_mut();
-                user_impl.receive(XdgRequest::NewPopup { surface: handle }, ());
+            (&mut *user_impl)(XdgRequest::NewPopup { surface: handle });
         }
-            xdg_surface::Request::SetWindowGeometry {
+        xdg_surface::Request::SetWindowGeometry { x, y, width, height } => {
-                x,
+            data.shell_data
-                y,
+                .compositor_token
-                width,
+                .with_role_data::<XdgSurfaceRole, _, _>(&data.wl_surface, |data| {
-                height,
+                    data.window_geometry = Some(Rectangle { x, y, width, height });
-            } => {
+                }).expect("xdg_surface exists but surface has not shell_surface role?!");
-                self.compositor_token
-                    .with_role_data::<XdgSurfaceRole, _, _>(surface, |data| {
-                        data.window_geometry = Some(Rectangle {
-                            x,
-                            y,
-                            width,
-                            height,
-                        });
-                    })
-                    .expect("xdg_surface exists but surface has not shell_surface role?!");
         }
         xdg_surface::Request::AckConfigure { serial } => {
-                self.compositor_token
+            data.shell_data
-                    .with_role_data::<XdgSurfaceRole, _, _>(surface, |data| {
+                .compositor_token
+                .with_role_data::<XdgSurfaceRole, _, _>(&data.wl_surface, |role_data| {
                     let mut found = false;
-                        data.pending_configures.retain(|&s| {
+                    role_data.pending_configures.retain(|&s| {
                         if s == serial {
                             found = true;
                         }
@@ -362,15 +333,13 @@ where
                     });
                     if !found {
                         // client responded to a non-existing configure
-                            shell.post_error(
+                        data.wm_base.post_error(
                             xdg_wm_base::Error::InvalidSurfaceState as u32,
                             format!("Wrong configure serial: {}", serial),
                         );
                     }
-                        data.configured = true;
+                    role_data.configured = true;
-                    })
+                }).expect("xdg_surface exists but surface has not shell_surface role?!");
-                    .expect("xdg_surface exists but surface has not shell_surface role?!");
-            }
         }
     }
 }
@@ -379,15 +348,16 @@ where
  * xdg_toplevel
  */
 
-pub type ShellSurfaceUserData = (
+pub(crate) struct ShellSurfaceUserData<U, R, SD> {
-    Resource<wl_surface::WlSurface>,
+    pub(crate) shell_data: ShellData<U, R, SD>,
-    Resource<xdg_wm_base::XdgWmBase>,
+    pub(crate) wl_surface: Resource<wl_surface::WlSurface>,
-    Resource<xdg_surface::XdgSurface>,
+    pub(crate) wm_base: Resource<xdg_wm_base::XdgWmBase>,
-);
+    pub(crate) xdg_surface: Resource<xdg_surface::XdgSurface>,
+}
 
 // Utility functions allowing to factor out a lot of the upcoming logic
 fn with_surface_toplevel_data<U, R, SD, F>(
-    implem: &ShellImplementation<U, R, SD>,
+    shell_data: &ShellData<U, R, SD>,
     toplevel: &Resource<xdg_toplevel::XdgToplevel>,
     f: F,
 ) where
@@ -396,27 +366,24 @@ fn with_surface_toplevel_data<U, R, SD, F>(
     SD: 'static,
     F: FnOnce(&mut ToplevelState),
 {
-    let ptr = toplevel.get_user_data();
+    let toplevel_data = toplevel.user_data::<ShellSurfaceUserData<U, R, SD>>().unwrap();
-    let &(ref surface, _, _) = unsafe { &*(ptr as *mut ShellSurfaceUserData) };
+    shell_data
-    implem
         .compositor_token
-        .with_role_data::<XdgSurfaceRole, _, _>(surface, |data| match data.pending_state {
+        .with_role_data::<XdgSurfaceRole, _, _>(&toplevel_data.wl_surface, |data| match data.pending_state {
             XdgSurfacePendingState::Toplevel(ref mut toplevel_data) => f(toplevel_data),
             _ => unreachable!(),
-        })
+        }).expect("xdg_toplevel exists but surface has not shell_surface role?!");
-        .expect("xdg_toplevel exists but surface has not shell_surface role?!");
 }
 
-pub fn send_toplevel_configure<U, R>(
+pub fn send_toplevel_configure<U, R, SD>(
-    token: CompositorToken<U, R>,
     resource: &Resource<xdg_toplevel::XdgToplevel>,
     configure: ToplevelConfigure,
 ) where
     U: 'static,
     R: Role<XdgSurfaceRole> + 'static,
+    SD: 'static,
 {
-    let &(ref surface, _, ref shell_surface) =
+    let data = resource.user_data::<ShellSurfaceUserData<U, R, SD>>().unwrap();
-        unsafe { &*(resource.get_user_data() as *mut ShellSurfaceUserData) };
     let (width, height) = configure.size.unwrap_or((0, 0));
     // convert the Vec<State> (which is really a Vec<u32>) into Vec<u8>
     let states = {
@@ -433,177 +400,153 @@ pub fn send_toplevel_configure<U, R>(
         height,
         states,
     });
-    shell_surface.send(xdg_surface::Event::Configure { serial });
+    data.xdg_surface.send(xdg_surface::Event::Configure { serial });
     // Add the configure as pending
-    token
+    data.shell_data
-        .with_role_data::<XdgSurfaceRole, _, _>(surface, |data| data.pending_configures.push(serial))
+        .compositor_token
+        .with_role_data::<XdgSurfaceRole, _, _>(&data.wl_surface, |data| data.pending_configures.push(serial))
         .expect("xdg_toplevel exists but surface has not shell_surface role?!");
 }
 
-fn make_toplevel_handle<U, R, SD>(
+fn make_toplevel_handle<U: 'static, R: 'static, SD: 'static>(
-    token: CompositorToken<U, R>,
     resource: &Resource<xdg_toplevel::XdgToplevel>,
 ) -> super::ToplevelSurface<U, R, SD> {
-    let ptr = resource.get_user_data();
+    let data = resource.user_data::<ShellSurfaceUserData<U, R, SD>>().unwrap();
-    let &(ref wl_surface, _, _) = unsafe { &*(ptr as *mut ShellSurfaceUserData) };
     super::ToplevelSurface {
-        wl_surface: wl_surface.clone(),
+        wl_surface: data.wl_surface.clone(),
         shell_surface: ToplevelKind::Xdg(resource.clone()),
-        token,
+        token: data.shell_data.compositor_token,
         _shell_data: ::std::marker::PhantomData,
     }
 }
 
-impl<U, R, SD> Implementation<Resource<xdg_toplevel::XdgToplevel>, xdg_toplevel::Request>
+fn toplevel_implementation<U, R, SD>(
-    for ShellImplementation<U, R, SD>
+    request: xdg_toplevel::Request,
-where
-    U: 'static,
-    R: Role<XdgSurfaceRole> + 'static,
-    SD: 'static,
-{
-    fn receive(&mut self, request: xdg_toplevel::Request, toplevel: Resource<xdg_toplevel::XdgToplevel>) {
-        match request {
-            xdg_toplevel::Request::Destroy => {
-                // all it done by the destructor
-            }
-            xdg_toplevel::Request::SetParent { parent } => {
-                with_surface_toplevel_data(self, &toplevel, |toplevel_data| {
-                    toplevel_data.parent = parent.map(|toplevel_surface_parent| {
-                        let parent_ptr = toplevel_surface_parent.get_user_data();
-                        let &(ref parent_surface, _, _) =
-                            unsafe { &*(parent_ptr as *mut ShellSurfaceUserData) };
-                        parent_surface.clone()
-                    })
-                });
-            }
-            xdg_toplevel::Request::SetTitle { title } => {
-                with_surface_toplevel_data(self, &toplevel, |toplevel_data| {
-                    toplevel_data.title = title;
-                });
-            }
-            xdg_toplevel::Request::SetAppId { app_id } => {
-                with_surface_toplevel_data(self, &toplevel, |toplevel_data| {
-                    toplevel_data.app_id = app_id;
-                });
-            }
-            xdg_toplevel::Request::ShowWindowMenu { seat, serial, x, y } => {
-                let handle = make_toplevel_handle(self.compositor_token, &toplevel);
-                let mut user_impl = self.user_impl.borrow_mut();
-                user_impl.receive(
-                    XdgRequest::ShowWindowMenu {
-                        surface: handle,
-                        seat,
-                        serial,
-                        location: (x, y),
-                    },
-                    (),
-                );
-            }
-            xdg_toplevel::Request::Move { seat, serial } => {
-                let handle = make_toplevel_handle(self.compositor_token, &toplevel);
-                let mut user_impl = self.user_impl.borrow_mut();
-                user_impl.receive(
-                    XdgRequest::Move {
-                        surface: handle,
-                        seat,
-                        serial,
-                    },
-                    (),
-                );
-            }
-            xdg_toplevel::Request::Resize {
-                seat,
-                serial,
-                edges,
-            } => {
-                let edges =
-                    xdg_toplevel::ResizeEdge::from_raw(edges).unwrap_or(xdg_toplevel::ResizeEdge::None);
-                let handle = make_toplevel_handle(self.compositor_token, &toplevel);
-                let mut user_impl = self.user_impl.borrow_mut();
-                user_impl.receive(
-                    XdgRequest::Resize {
-                        surface: handle,
-                        seat,
-                        serial,
-                        edges,
-                    },
-                    (),
-                );
-            }
-            xdg_toplevel::Request::SetMaxSize { width, height } => {
-                with_surface_toplevel_data(self, &toplevel, |toplevel_data| {
-                    toplevel_data.max_size = (width, height);
-                });
-            }
-            xdg_toplevel::Request::SetMinSize { width, height } => {
-                with_surface_toplevel_data(self, &toplevel, |toplevel_data| {
-                    toplevel_data.max_size = (width, height);
-                });
-            }
-            xdg_toplevel::Request::SetMaximized => {
-                let handle = make_toplevel_handle(self.compositor_token, &toplevel);
-                let mut user_impl = self.user_impl.borrow_mut();
-                user_impl.receive(XdgRequest::Maximize { surface: handle }, ());
-            }
-            xdg_toplevel::Request::UnsetMaximized => {
-                let handle = make_toplevel_handle(self.compositor_token, &toplevel);
-                let mut user_impl = self.user_impl.borrow_mut();
-                user_impl.receive(XdgRequest::UnMaximize { surface: handle }, ());
-            }
-            xdg_toplevel::Request::SetFullscreen { output } => {
-                let handle = make_toplevel_handle(self.compositor_token, &toplevel);
-                let mut user_impl = self.user_impl.borrow_mut();
-                user_impl.receive(
-                    XdgRequest::Fullscreen {
-                        surface: handle,
-                        output,
-                    },
-                    (),
-                );
-            }
-            xdg_toplevel::Request::UnsetFullscreen => {
-                let handle = make_toplevel_handle(self.compositor_token, &toplevel);
-                let mut user_impl = self.user_impl.borrow_mut();
-                user_impl.receive(XdgRequest::UnFullscreen { surface: handle }, ());
-            }
-            xdg_toplevel::Request::SetMinimized => {
-                let handle = make_toplevel_handle(self.compositor_token, &toplevel);
-                let mut user_impl = self.user_impl.borrow_mut();
-                user_impl.receive(XdgRequest::Minimize { surface: handle }, ());
-            }
-        }
-    }
-}
-
-fn destroy_toplevel<U, R, SD>(
     toplevel: Resource<xdg_toplevel::XdgToplevel>,
-    implem: Box<Implementation<Resource<xdg_toplevel::XdgToplevel>, xdg_toplevel::Request>>,
 ) where
     U: 'static,
     R: Role<XdgSurfaceRole> + 'static,
     SD: 'static,
 {
-    let implem: ShellImplementation<U, R, SD> = *downcast_impl(implem).unwrap_or_else(|_| unreachable!());
+    let data = toplevel.user_data::<ShellSurfaceUserData<U, R, SD>>().unwrap();
-    let ptr = toplevel.get_user_data();
+    match request {
-    toplevel.set_user_data(::std::ptr::null_mut());
+        xdg_toplevel::Request::Destroy => {
-    // take back ownership of the userdata
+            // all it done by the destructor
-    let data = *unsafe { Box::from_raw(ptr as *mut ShellSurfaceUserData) };
+        }
-    if !data.0.is_alive() {
+        xdg_toplevel::Request::SetParent { parent } => {
+            with_surface_toplevel_data(&data.shell_data, &toplevel, |toplevel_data| {
+                toplevel_data.parent = parent.map(|toplevel_surface_parent| {
+                    toplevel_surface_parent
+                        .user_data::<ShellSurfaceUserData<U, R, SD>>()
+                        .unwrap()
+                        .wl_surface
+                        .clone()
+                })
+            });
+        }
+        xdg_toplevel::Request::SetTitle { title } => {
+            with_surface_toplevel_data(&data.shell_data, &toplevel, |toplevel_data| {
+                toplevel_data.title = title;
+            });
+        }
+        xdg_toplevel::Request::SetAppId { app_id } => {
+            with_surface_toplevel_data(&data.shell_data, &toplevel, |toplevel_data| {
+                toplevel_data.app_id = app_id;
+            });
+        }
+        xdg_toplevel::Request::ShowWindowMenu { seat, serial, x, y } => {
+            let handle = make_toplevel_handle(&toplevel);
+            let mut user_impl = data.shell_data.user_impl.borrow_mut();
+            (&mut *user_impl)(XdgRequest::ShowWindowMenu {
+                surface: handle,
+                seat,
+                serial,
+                location: (x, y),
+            });
+        }
+        xdg_toplevel::Request::Move { seat, serial } => {
+            let handle = make_toplevel_handle(&toplevel);
+            let mut user_impl = data.shell_data.user_impl.borrow_mut();
+            (&mut *user_impl)(XdgRequest::Move {
+                surface: handle,
+                seat,
+                serial,
+            });
+        }
+        xdg_toplevel::Request::Resize { seat, serial, edges } => {
+            let edges = xdg_toplevel::ResizeEdge::from_raw(edges).unwrap_or(xdg_toplevel::ResizeEdge::None);
+            let handle = make_toplevel_handle(&toplevel);
+            let mut user_impl = data.shell_data.user_impl.borrow_mut();
+            (&mut *user_impl)(XdgRequest::Resize {
+                surface: handle,
+                seat,
+                serial,
+                edges,
+            });
+        }
+        xdg_toplevel::Request::SetMaxSize { width, height } => {
+            with_surface_toplevel_data(&data.shell_data, &toplevel, |toplevel_data| {
+                toplevel_data.max_size = (width, height);
+            });
+        }
+        xdg_toplevel::Request::SetMinSize { width, height } => {
+            with_surface_toplevel_data(&data.shell_data, &toplevel, |toplevel_data| {
+                toplevel_data.max_size = (width, height);
+            });
+        }
+        xdg_toplevel::Request::SetMaximized => {
+            let handle = make_toplevel_handle(&toplevel);
+            let mut user_impl = data.shell_data.user_impl.borrow_mut();
+            (&mut *user_impl)(XdgRequest::Maximize { surface: handle });
+        }
+        xdg_toplevel::Request::UnsetMaximized => {
+            let handle = make_toplevel_handle(&toplevel);
+            let mut user_impl = data.shell_data.user_impl.borrow_mut();
+            (&mut *user_impl)(XdgRequest::UnMaximize { surface: handle });
+        }
+        xdg_toplevel::Request::SetFullscreen { output } => {
+            let handle = make_toplevel_handle(&toplevel);
+            let mut user_impl = data.shell_data.user_impl.borrow_mut();
+            (&mut *user_impl)(XdgRequest::Fullscreen {
+                surface: handle,
+                output,
+            });
+        }
+        xdg_toplevel::Request::UnsetFullscreen => {
+            let handle = make_toplevel_handle(&toplevel);
+            let mut user_impl = data.shell_data.user_impl.borrow_mut();
+            (&mut *user_impl)(XdgRequest::UnFullscreen { surface: handle });
+        }
+        xdg_toplevel::Request::SetMinimized => {
+            let handle = make_toplevel_handle(&toplevel);
+            let mut user_impl = data.shell_data.user_impl.borrow_mut();
+            (&mut *user_impl)(XdgRequest::Minimize { surface: handle });
+        }
+    }
+}
+
+fn destroy_toplevel<U, R, SD>(toplevel: Resource<xdg_toplevel::XdgToplevel>)
+where
+    U: 'static,
+    R: Role<XdgSurfaceRole> + 'static,
+    SD: 'static,
+{
+    let data = toplevel.user_data::<ShellSurfaceUserData<U, R, SD>>().unwrap();
+    if !data.wl_surface.is_alive() {
         // the wl_surface is destroyed, this means the client is not
         // trying to change the role but it's a cleanup (possibly a
         // disconnecting client), ignore the protocol check.
         return;
     } else {
-        implem
+        data.shell_data
             .compositor_token
-            .with_role_data::<XdgSurfaceRole, _, _>(&data.0, |data| {
+            .with_role_data::<XdgSurfaceRole, _, _>(&data.wl_surface, |data| {
                 data.pending_state = XdgSurfacePendingState::None;
                 data.configured = false;
-            })
+            }).expect("xdg_toplevel exists but surface has not shell_surface role?!");
-            .expect("xdg_toplevel exists but surface has not shell_surface role?!");
     }
     // remove this surface from the known ones (as well as any leftover dead surface)
-    implem
+    data.shell_data
         .shell_state
         .lock()
         .unwrap()
@@ -615,103 +558,84 @@ fn destroy_toplevel<U, R, SD>(
  * xdg_popup
  */
 
-pub(crate) fn send_popup_configure<U, R>(
+pub(crate) fn send_popup_configure<U, R, SD>(
-    token: CompositorToken<U, R>,
     resource: &Resource<xdg_popup::XdgPopup>,
     configure: PopupConfigure,
 ) where
     U: 'static,
     R: Role<XdgSurfaceRole> + 'static,
+    SD: 'static,
 {
-    let &(ref surface, _, ref shell_surface) =
+    let data = resource.user_data::<ShellSurfaceUserData<U, R, SD>>().unwrap();
-        unsafe { &*(resource.get_user_data() as *mut ShellSurfaceUserData) };
     let (x, y) = configure.position;
     let (width, height) = configure.size;
     let serial = configure.serial;
-    resource.send(xdg_popup::Event::Configure {
+    resource.send(xdg_popup::Event::Configure { x, y, width, height });
-        x,
+    data.xdg_surface.send(xdg_surface::Event::Configure { serial });
-        y,
-        width,
-        height,
-    });
-    shell_surface.send(xdg_surface::Event::Configure { serial });
     // Add the configure as pending
-    token
+    data.shell_data
-        .with_role_data::<XdgSurfaceRole, _, _>(surface, |data| data.pending_configures.push(serial))
+        .compositor_token
+        .with_role_data::<XdgSurfaceRole, _, _>(&data.wl_surface, |data| data.pending_configures.push(serial))
         .expect("xdg_toplevel exists but surface has not shell_surface role?!");
 }
 
-fn make_popup_handle<U, R, SD>(
+fn make_popup_handle<U: 'static, R: 'static, SD: 'static>(
-    token: CompositorToken<U, R>,
     resource: &Resource<xdg_popup::XdgPopup>,
 ) -> super::PopupSurface<U, R, SD> {
-    let ptr = resource.get_user_data();
+    let data = resource.user_data::<ShellSurfaceUserData<U, R, SD>>().unwrap();
-    let &(ref wl_surface, _, _) = unsafe { &*(ptr as *mut ShellSurfaceUserData) };
     super::PopupSurface {
-        wl_surface: wl_surface.clone(),
+        wl_surface: data.wl_surface.clone(),
         shell_surface: PopupKind::Xdg(resource.clone()),
-        token,
+        token: data.shell_data.compositor_token,
         _shell_data: ::std::marker::PhantomData,
     }
 }
 
-impl<U, R, SD> Implementation<Resource<xdg_popup::XdgPopup>, xdg_popup::Request>
+fn xg_popup_implementation<U, R, SD>(request: xdg_popup::Request, popup: Resource<xdg_popup::XdgPopup>)
-    for ShellImplementation<U, R, SD>
 where
     U: 'static,
     R: Role<XdgSurfaceRole> + 'static,
     SD: 'static,
 {
-    fn receive(&mut self, request: xdg_popup::Request, popup: Resource<xdg_popup::XdgPopup>) {
+    let data = popup.user_data::<ShellSurfaceUserData<U, R, SD>>().unwrap();
     match request {
         xdg_popup::Request::Destroy => {
             // all is handled by our destructor
         }
         xdg_popup::Request::Grab { seat, serial } => {
-                let handle = make_popup_handle(self.compositor_token, &popup);
+            let handle = make_popup_handle(&popup);
-                let mut user_impl = self.user_impl.borrow_mut();
+            let mut user_impl = data.shell_data.user_impl.borrow_mut();
-                user_impl.receive(
+            (&mut *user_impl)(XdgRequest::Grab {
-                    XdgRequest::Grab {
                 surface: handle,
                 seat,
                 serial,
-                    },
+            });
-                    (),
-                );
-            }
         }
     }
 }
 
-fn destroy_popup<U, R, SD>(
+fn destroy_popup<U, R, SD>(popup: Resource<xdg_popup::XdgPopup>)
-    popup: Resource<xdg_popup::XdgPopup>,
+where
-    implem: Box<Implementation<Resource<xdg_popup::XdgPopup>, xdg_popup::Request>>,
-) where
     U: 'static,
     R: Role<XdgSurfaceRole> + 'static,
     SD: 'static,
 {
-    let implem: ShellImplementation<U, R, SD> = *downcast_impl(implem).unwrap_or_else(|_| unreachable!());
+    let data = popup.user_data::<ShellSurfaceUserData<U, R, SD>>().unwrap();
-    let ptr = popup.get_user_data();
+    if !data.wl_surface.is_alive() {
-    popup.set_user_data(::std::ptr::null_mut());
-    // take back ownership of the userdata
-    let data = *unsafe { Box::from_raw(ptr as *mut ShellSurfaceUserData) };
-    if !data.0.is_alive() {
         // the wl_surface is destroyed, this means the client is not
         // trying to change the role but it's a cleanup (possibly a
         // disconnecting client), ignore the protocol check.
         return;
     } else {
-        implem
+        data.shell_data
             .compositor_token
-            .with_role_data::<XdgSurfaceRole, _, _>(&data.0, |data| {
+            .with_role_data::<XdgSurfaceRole, _, _>(&data.wl_surface, |data| {
                 data.pending_state = XdgSurfacePendingState::None;
                 data.configured = false;
-            })
+            }).expect("xdg_popup exists but surface has not shell_surface role?!");
-            .expect("xdg_popup exists but surface has not shell_surface role?!");
     }
     // remove this surface from the known ones (as well as any leftover dead surface)
-    implem
+    data.shell_data
         .shell_state
         .lock()
         .unwrap()

src/wayland/shm/mod.rs

@@ -23,21 +23,21 @@
 //! use wayland_server::protocol::wl_shm::Format;
 //!
 //! # fn main() {
-//! # let (mut display, mut event_loop) = wayland_server::Display::new();
+//! # let mut event_loop = wayland_server::calloop::EventLoop::<()>::new().unwrap();
+//! # let mut display = wayland_server::Display::new(event_loop.handle());
 //! // Insert the ShmGlobal into your event loop
 //! // Here, we specify that Yuyv and C8 format are supported
 //! // additionnaly to the standart Argb8888 and Xrgb8888.
 //! let shm_global = init_shm_global(
 //!     &mut display,
-//!     event_loop.token(),
 //!     vec![Format::Yuyv, Format::C8],
 //!     None // we don't provide a logger here
 //! );
 //! # }
 //! ```
 //!
-//! Then, when you have a `WlBuffer` and need to retrieve its contents, use the token method to
+//! Then, when you have a `WlBuffer` and need to retrieve its contents, use the
-//! do it:
+//! `with_buffer_contents` function to do it:
 //!
 //! ```
 //! # extern crate wayland_server;
@@ -45,13 +45,27 @@
 //! # use wayland_server::protocol::wl_buffer::WlBuffer;
 //! # use wayland_server::Resource;
 //! # fn wrap(buffer: &Resource<WlBuffer>) {
-//! use smithay::wayland::shm::{with_buffer_contents, BufferData};
+//! use smithay::wayland::shm::{with_buffer_contents, BufferData, BufferAccessError};
 //!
-//! with_buffer_contents(&buffer,
+//! let content = with_buffer_contents(&buffer,
 //!     |slice: &[u8], buffer_metadata: BufferData| {
-//!         // do something to draw it on the screen
+//!         // do something to extract the contents of the buffer
 //!     }
 //! );
+//!
+//! match content {
+//!     Ok(something) =>  {
+//!         /* `something` is the content you returned from the closure */
+//!     },
+//!     Err(BufferAccessError::NotManaged) => {
+//!         /* This buffer is not managed by the SHM global, but by something else */
+//!     },
+//!     Err(BufferAccessError::BadMap) => {
+//!         /* The client supplied invalid content specification for this buffer,
+//!            and was killed.
+//!          */
+//!     }
+//! }
 //! # }
 //! # fn main() {}
 //! ```
@@ -66,9 +80,8 @@
 use self::pool::{Pool, ResizeError};
 use std::rc::Rc;
 use std::sync::Arc;
-use wayland_server::{Display, Global, LoopToken, NewResource, Resource};
-use wayland_server::commons::Implementation;
 use wayland_server::protocol::{wl_buffer, wl_shm, wl_shm_pool};
+use wayland_server::{Display, DisplayToken, Global, NewResource, Resource};
 
 mod pool;
 
@@ -80,7 +93,7 @@ mod pool;
 pub struct ShmGlobalData {
     formats: Rc<Vec<wl_shm::Format>>,
     log: ::slog::Logger,
-    token: LoopToken,
+    token: DisplayToken,
 }
 
 /// Create a new SHM global advertizing given supported formats.
@@ -94,7 +107,6 @@ pub struct ShmGlobalData {
 /// the future.
 pub fn init_shm_global<L>(
     display: &mut Display,
-    token: LoopToken,
     mut formats: Vec<wl_shm::Format>,
     logger: L,
 ) -> Global<wl_shm::WlShm>
@@ -109,11 +121,19 @@ where
     let data = ShmGlobalData {
         formats: Rc::new(formats),
         log: log.new(o!("smithay_module" => "shm_handler")),
-        token: token.clone(),
+        token: display.get_token(),
     };
 
-    display.create_global::<wl_shm::WlShm, _>(&token, 1, move |_version, shm_new: NewResource<_>| {
+    display.create_global::<wl_shm::WlShm, _>(1, move |shm_new: NewResource<_>, _version| {
-        let shm = shm_new.implement_nonsend(data.clone(), None::<fn(_, _)>, &data.token);
+        let shm = shm_new.implement_nonsend(
+            {
+                let mut data = data.clone();
+                move |req, shm| data.receive_shm_message(req, shm)
+            },
+            None::<fn(_)>,
+            (),
+            &data.token,
+        );
         // send the formats
         for f in &data.formats[..] {
             shm.send(wl_shm::Event::Format { format: *f });
@@ -152,10 +172,10 @@ pub fn with_buffer_contents<F, T>(
 where
     F: FnOnce(&[u8], BufferData) -> T,
 {
-    if !buffer.is_implemented_with::<ShmGlobalData>() {
+    let data = match buffer.user_data::<InternalBufferData>() {
-        return Err(BufferAccessError::NotManaged);
+        Some(d) => d,
-    }
+        None => return Err(BufferAccessError::NotManaged),
-    let data = unsafe { &*(buffer.get_user_data() as *mut InternalBufferData) };
+    };
 
     match data.pool.with_data_slice(|slice| f(slice, data.data)) {
         Ok(t) => Ok(t),
@@ -167,12 +187,11 @@ where
     }
 }
 
-impl Implementation<Resource<wl_shm::WlShm>, wl_shm::Request> for ShmGlobalData {
+impl ShmGlobalData {
-    fn receive(&mut self, request: wl_shm::Request, shm: Resource<wl_shm::WlShm>) {
+    fn receive_shm_message(&mut self, request: wl_shm::Request, shm: Resource<wl_shm::WlShm>) {
         use self::wl_shm::{Error, Request};
 
-        match request {
+        let Request::CreatePool { id: pool, fd, size } = request;
-            Request::CreatePool { id: pool, fd, size } => {
         if size <= 0 {
             shm.post_error(
                 Error::InvalidFd as u32,
@@ -190,17 +209,16 @@ impl Implementation<Resource<wl_shm::WlShm>, wl_shm::Request> for ShmGlobalData
                 return;
             }
         };
-                let arc_pool = Box::new(Arc::new(mmap_pool));
+        let arc_pool = Arc::new(mmap_pool);
-                let pool = pool.implement_nonsend(
+        pool.implement_nonsend(
-                    self.clone(),
+            {
-                    Some(|pool: Resource<_>, _| {
+                let mut data = self.clone();
-                        drop(unsafe { Box::from_raw(pool.get_user_data() as *mut Arc<Pool>) })
+                move |req, pool| data.receive_pool_message(req, pool)
-                    }),
+            },
+            None::<fn(_)>,
+            arc_pool,
             &self.token,
         );
-                pool.set_user_data(Box::into_raw(arc_pool) as *mut ());
-            }
-        }
     }
 }
 
@@ -224,11 +242,15 @@ struct InternalBufferData {
     data: BufferData,
 }
 
-impl Implementation<Resource<wl_shm_pool::WlShmPool>, wl_shm_pool::Request> for ShmGlobalData {
+impl ShmGlobalData {
-    fn receive(&mut self, request: wl_shm_pool::Request, pool: Resource<wl_shm_pool::WlShmPool>) {
+    fn receive_pool_message(
+        &mut self,
+        request: wl_shm_pool::Request,
+        pool: Resource<wl_shm_pool::WlShmPool>,
+    ) {
         use self::wl_shm_pool::Request;
 
-        let arc_pool = unsafe { &*(pool.get_user_data() as *mut Arc<Pool>) };
+        let arc_pool = pool.user_data::<Arc<Pool>>().unwrap();
 
         match request {
             Request::CreateBuffer {
@@ -246,7 +268,7 @@ impl Implementation<Resource<wl_shm_pool::WlShmPool>, wl_shm_pool::Request> for
                     );
                     return;
                 }
-                let data = Box::into_raw(Box::new(InternalBufferData {
+                let data = InternalBufferData {
                     pool: arc_pool.clone(),
                     data: BufferData {
                         offset,
@@ -255,15 +277,16 @@ impl Implementation<Resource<wl_shm_pool::WlShmPool>, wl_shm_pool::Request> for
                         stride,
                         format,
                     },
-                }));
+                };
-                let buffer = buffer.implement_nonsend(
+                buffer.implement_nonsend(
-                    self.clone(),
+                    |req, _| {
-                    Some(|buffer: Resource<_>, _| {
+                        // this will break if a variant is added to wl_buffer::Request
-                        drop(unsafe { Box::from_raw(buffer.get_user_data() as *mut InternalBufferData) })
+                        let wl_buffer::Request::Destroy = req;
-                    }),
+                    },
+                    None::<fn(_)>,
+                    data,
                     &self.token,
                 );
-                buffer.set_user_data(data as *mut ());
             }
             Request::Resize { size } => match arc_pool.resize(size) {
                 Ok(()) => {}
@@ -281,10 +304,3 @@ impl Implementation<Resource<wl_shm_pool::WlShmPool>, wl_shm_pool::Request> for
         }
     }
 }
-
-impl Implementation<Resource<wl_buffer::WlBuffer>, wl_buffer::Request> for ShmGlobalData {
-    fn receive(&mut self, request: wl_buffer::Request, _pool: Resource<wl_buffer::WlBuffer>) {
-        // this will break if new requests are added to buffer =)
-        let wl_buffer::Request::Destroy = request;
-    }
-}

src/wayland/shm/pool.rs

@@ -1,6 +1,6 @@
-use nix::{libc, unistd};
 use nix::sys::mman;
 use nix::sys::signal::{self, SigAction, SigHandler, Signal};
+use nix::{libc, unistd};
 use std::cell::Cell;
 use std::os::unix::io::RawFd;
 use std::ptr;

src/xwayland/mod.rs

@@ -1,4 +1,4 @@
-mod xserver;
 mod x11_sockets;
+mod xserver;
 
 pub use self::xserver::{XWayland, XWindowManager};

src/xwayland/x11_sockets.rs

@@ -2,9 +2,9 @@ use std::io::{Read, Write};
 use std::os::unix::io::FromRawFd;
 use std::os::unix::net::UnixStream;
 
-use nix::{Error as NixError, Result as NixResult};
 use nix::errno::Errno;
 use nix::sys::socket;
+use nix::{Error as NixError, Result as NixResult};
 
 /// Find a free X11 display slot and setup
 pub(crate) fn prepare_x11_sockets(log: ::slog::Logger) -> Result<(X11Lock, [UnixStream; 2]), ()> {
@@ -62,11 +62,13 @@ impl X11Lock {
                 let mut spid = [0u8; 11];
                 file.read_exact(&mut spid).map_err(|_| ())?;
                 ::std::mem::drop(file);
-                let pid = ::nix::unistd::Pid::from_raw(::std::str::from_utf8(&spid)
+                let pid = ::nix::unistd::Pid::from_raw(
+                    ::std::str::from_utf8(&spid)
                         .map_err(|_| ())?
                         .trim()
                         .parse::<i32>()
-                    .map_err(|_| ())?);
+                        .map_err(|_| ())?,
+                );
                 if let Err(NixError::Sys(Errno::ESRCH)) = ::nix::sys::signal::kill(pid, None) {
                     // no process whose pid equals the contents of the lockfile exists
                     // remove the lockfile and try grabbing it again

src/xwayland/xserver.rs

@@ -25,21 +25,22 @@
  *
  */
 use std::cell::RefCell;
-use std::rc::Rc;
 use std::env;
 use std::ffi::CString;
 use std::os::unix::io::{AsRawFd, IntoRawFd};
 use std::os::unix::net::UnixStream;
+use std::rc::Rc;
 
-use nix::{Error as NixError, Result as NixResult};
 use nix::errno::Errno;
-use nix::unistd::{fork, ForkResult, Pid};
 use nix::sys::signal;
+use nix::unistd::{fork, ForkResult, Pid};
+use nix::{Error as NixError, Result as NixResult};
 
-use wayland_server::{Client, Display, LoopToken};
+use wayland_server::calloop::signals::{Signal, Signals};
-use wayland_server::sources::{SignalEvent, Source};
+use wayland_server::calloop::{LoopHandle, Source};
+use wayland_server::{Client, Display};
 
-use super::x11_sockets::{X11Lock, prepare_x11_sockets};
+use super::x11_sockets::{prepare_x11_sockets, X11Lock};
 
 /// The XWayland handle
 pub struct XWayland<WM: XWindowManager> {
@@ -66,9 +67,9 @@ pub trait XWindowManager {
 
 impl<WM: XWindowManager + 'static> XWayland<WM> {
     /// Start the XWayland server
-    pub fn init<L>(
+    pub fn init<L, Data: 'static>(
         wm: WM,
-        token: LoopToken,
+        handle: LoopHandle<Data>,
         display: Rc<RefCell<Display>>,
         logger: L,
     ) -> Result<XWayland<WM>, ()>
@@ -78,7 +79,16 @@ impl<WM: XWindowManager + 'static> XWayland<WM> {
         let log = ::slog_or_stdlog(logger);
         let inner = Rc::new(RefCell::new(Inner {
             wm,
-            token,
+            source_maker: Box::new(move |inner| {
+                handle
+                    .insert_source(
+                        Signals::new(&[Signal::SIGUSR1]).map_err(|_| ())?,
+                        move |evt, _| {
+                            debug_assert!(evt.signal() == Signal::SIGUSR1);
+                            xwayland_ready(&inner);
+                        },
+                    ).map_err(|_| ())
+            }),
             wayland_display: display,
             instance: None,
             log: log.new(o!("smithay_module" => "XWayland")),
@@ -97,7 +107,7 @@ impl<WM: XWindowManager> Drop for XWayland<WM> {
 struct XWaylandInstance {
     display_lock: X11Lock,
     wayland_client: Client,
-    sigusr1_handler: Option<Source<SignalEvent>>,
+    sigusr1_handler: Option<Source<Signals>>,
     wm_fd: Option<UnixStream>,
     started_at: ::std::time::Instant,
     child_pid: Option<Pid>,
@@ -106,7 +116,7 @@ struct XWaylandInstance {
 // Inner implementation of the XWayland manager
 struct Inner<WM: XWindowManager> {
     wm: WM,
-    token: LoopToken,
+    source_maker: Box<FnMut(Rc<RefCell<Inner<WM>>>) -> Result<Source<Signals>, ()>>,
     wayland_display: Rc<RefCell<Display>>,
     instance: Option<XWaylandInstance>,
     log: ::slog::Logger,
@@ -140,17 +150,11 @@ fn launch<WM: XWindowManager + 'static>(inner: &Rc<RefCell<Inner<WM>>>) -> Resul
             .borrow_mut()
             .create_client(wl_me.into_raw_fd())
     };
-    client.set_user_data(Rc::into_raw(inner.clone()) as *const () as *mut ());
+    client.data_map().insert_if_missing(|| inner.clone());
-    client.set_destructor(client_destroy::<WM>);
+    client.add_destructor(client_destroy::<WM>);
 
     // setup the SIGUSR1 handler
-    let my_inner = inner.clone();
+    let sigusr1_handler = (&mut *guard.source_maker)(inner.clone())?;
-    let sigusr1_handler = guard
-        .token
-        .add_signal_event_source(signal::Signal::SIGUSR1, move |_, ()| {
-            xwayland_ready(&my_inner)
-        })
-        .map_err(|_| ())?;
 
     // all is ready, we can do the fork dance
     let child_pid = match fork() {
@@ -242,8 +246,8 @@ impl<WM: XWindowManager> Inner<WM> {
     }
 }
 
-fn client_destroy<WM: XWindowManager + 'static>(data: *mut ()) {
+fn client_destroy<WM: XWindowManager + 'static>(map: &::wayland_server::UserDataMap) {
-    let inner = unsafe { Rc::from_raw(data as *const () as *const RefCell<Inner<WM>>) };
+    let inner = map.get::<Rc<RefCell<Inner<WM>>>>().unwrap();
 
     // shutdown the server
     let started_at = inner.borrow().instance.as_ref().map(|i| i.started_at);