mirror of
https://github.com/golang/go
synced 2024-11-17 17:34:46 -07:00
54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
|
// run
|
||
|
|
|
||
|
|
// Copyright 2015 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.
|
||
|
|
|
||
|
|
// Test that stack barriers are reset when a goroutine exits without
|
||
|
|
// returning.
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"runtime"
|
||
|
|
"sync/atomic"
|
||
|
|
"time"
|
||
|
|
)
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
// Let the garbage collector run concurrently.
|
||
|
|
runtime.GOMAXPROCS(2)
|
||
|
|
|
||
|
|
var x [100][]byte
|
||
|
|
|
||
|
|
for i := range x {
|
||
|
|
var done int32
|
||
|
|
|
||
|
|
go func() {
|
||
|
|
// Use enough stack to get stack barriers, but
|
||
|
|
// not so much that we go over _FixedStack.
|
||
|
|
// There's a very narrow window here on most
|
||
|
|
// OSs, so we basically can't do anything (not
|
||
|
|
// even a time.Sleep or a channel).
|
||
|
|
var buf [1024]byte
|
||
|
|
buf[0]++
|
||
|
|
for atomic.LoadInt32(&done) == 0 {
|
||
|
|
runtime.Gosched()
|
||
|
|
}
|
||
|
|
atomic.StoreInt32(&done, 0)
|
||
|
|
// Exit without unwinding stack barriers.
|
||
|
|
runtime.Goexit()
|
||
|
|
}()
|
||
|
|
|
||
|
|
// Generate some garbage.
|
||
|
|
x[i] = make([]byte, 1024*1024)
|
||
|
|
|
||
|
|
// Give GC some time to install stack barriers in the G.
|
||
|
|
time.Sleep(50 * time.Microsecond)
|
||
|
|
atomic.StoreInt32(&done, 1)
|
||
|
|
for atomic.LoadInt32(&done) == 1 {
|
||
|
|
runtime.Gosched()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|