go dropm 源码
golang dropm 代码
文件路径：/src/runtime/testdata/testprogcgo/dropm.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 !plan9 && !windows
// +build !plan9,!windows
// Test that a sequence of callbacks from C to Go get the same m.
// This failed to be true on arm and arm64, which was the root cause
// of issue 13881.
package main
/*
#include <stddef.h>
#include <pthread.h>
extern void GoCheckM();
static void* thread(void* arg __attribute__ ((unused))) {
GoCheckM();
return NULL;
}
static void CheckM() {
pthread_t tid;
pthread_create(&tid, NULL, thread, NULL);
pthread_join(tid, NULL);
pthread_create(&tid, NULL, thread, NULL);
pthread_join(tid, NULL);
}
*/
import "C"
import (
"fmt"
"os"
)
func init() {
register("EnsureDropM", EnsureDropM)
}
var savedM uintptr
//export GoCheckM
func GoCheckM() {
m := runtime_getm_for_test()
if savedM == 0 {
savedM = m
} else if savedM != m {
fmt.Printf("m == %x want %x\n", m, savedM)
os.Exit(1)
}
}
func EnsureDropM() {
C.CheckM()
fmt.Println("OK")
}
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