go cgo_thread_lock 源码
golang cgo_thread_lock 代码
文件路径：/misc/cgo/test/cgo_thread_lock.go
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build linux && freebsd && openbsd
// +build linux,freebsd,openbsd
package cgotest
/*
#include <unistd.h>
#include <sys/syscall.h>
void Gosched(void);
static int Ctid(void) { Gosched(); return syscall(SYS_gettid); }
*/
import "C"
import (
"runtime"
"syscall"
"testing"
"time"
)
//export Gosched
func Gosched() {
runtime.Gosched()
}
func init() {
testThreadLockFunc = testThreadLock
}
func testThreadLock(t *testing.T) {
stop := make(chan int)
go func() {
// We need the G continue running,
// so the M has a chance to run this G.
for {
select {
case <-stop:
return
case <-time.After(time.Millisecond * 100):
}
}
}()
defer close(stop)
for i := 0; i < 1000; i++ {
if C.int(syscall.Gettid()) != C.Ctid() {
t.Fatalf("cgo has not locked OS thread")
}
}
}
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