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// Copyright 2023 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
// Test that callbacks from C to Go in the same C-thread always get the same m.
// Make sure the extra M bind to the C-thread.
package main
/*
extern void CheckBindM();
*/
import "C"
import (
"fmt"
"os"
"runtime"
"sync"
"sync/atomic"
)
var (
mutex = sync.Mutex{}
cThreadToM = map[uintptr]uintptr{}
started = atomic.Uint32{}
)
// same as CTHREADS in C, make sure all the C threads are actually started.
const cThreadNum = 2
func init() {
register("EnsureBindM", EnsureBindM)
}
//export GoCheckBindM
func GoCheckBindM(thread uintptr) {
// Wait all threads start
if started.Load() != cThreadNum {
// Only once for each thread, since it will wait all threads start.
started.Add(1)
for started.Load() < cThreadNum {
runtime.Gosched()
}
}
m := runtime_getm_for_test()
mutex.Lock()
defer mutex.Unlock()
if savedM, ok := cThreadToM[thread]; ok && savedM != m {
fmt.Printf("m == %x want %x\n", m, savedM)
os.Exit(1)
}
cThreadToM[thread] = m
}
func EnsureBindM() {
C.CheckBindM()
fmt.Println("OK")
}