46 lines
667 B
Go
46 lines
667 B
Go
package main
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import (
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"fmt"
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"sync"
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"unsafe"
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)
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/*
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#cgo CFLAGS: -I .
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#cgo LDFLAGS: -L .
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#include "mylib.h"
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void callOnMeGo_cgo(int n);
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*/
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import "C"
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//export callOnMeGo
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func callOnMeGo(n int) {
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printerCallback(n)
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}
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type Printer func(int)
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var printerCallback Printer
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var printerCallbackLock sync.RWMutex
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func usePrinter(p Printer) {
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printerCallbackLock.Lock()
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printerCallback = p
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C.use_printer((C.printer_t)(unsafe.Pointer(C.callOnMeGo_cgo)))
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printerCallback = nil
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printerCallbackLock.Unlock()
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}
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var myPrinter Printer = Printer(func(n int) {
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for i := 0; i < n; i++ {
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fmt.Printf("%d\n", i)
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}
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})
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func main() {
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usePrinter(myPrinter)
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}
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