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