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invoke.go
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invoke.go
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//go:build linux
// +build linux
package linux
/*
#cgo linux pkg-config: gtk+-3.0
#include <stdio.h>
#include "gtk/gtk.h"
extern gboolean invokeCallbacks(void *);
static inline void triggerInvokesOnMainThread() {
g_idle_add((GSourceFunc)invokeCallbacks, NULL);
}
*/
import "C"
import (
"runtime"
"sync"
"unsafe"
"golang.org/x/sys/unix"
)
var (
m sync.Mutex
mainTid int
dispatchq []func()
)
func invokeOnMainThread(f func()) {
if tryInvokeOnCurrentGoRoutine(f) {
return
}
m.Lock()
dispatchq = append(dispatchq, f)
m.Unlock()
C.triggerInvokesOnMainThread()
}
func tryInvokeOnCurrentGoRoutine(f func()) bool {
m.Lock()
mainThreadID := mainTid
m.Unlock()
runtime.LockOSThread()
defer runtime.UnlockOSThread()
if mainThreadID != unix.Gettid() {
return false
}
f()
return true
}
//export invokeCallbacks
func invokeCallbacks(_ unsafe.Pointer) C.gboolean {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
m.Lock()
if mainTid == 0 {
mainTid = unix.Gettid()
}
q := append([]func(){}, dispatchq...)
dispatchq = []func(){}
m.Unlock()
for _, v := range q {
v()
}
return C.G_SOURCE_REMOVE
}