// Copyright 2013 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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// Only works on systems with syscall.Close.
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// We need a fast system call to provoke the race,
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// and Close(-1) is nearly universally fast.
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// +build aix darwin dragonfly freebsd linux netbsd openbsd plan9
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package runtime_test
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import (
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"runtime"
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"sync"
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"sync/atomic"
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"syscall"
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"testing"
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)
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func TestGoroutineProfile(t *testing.T) {
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// GoroutineProfile used to use the wrong starting sp for
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// goroutines coming out of system calls, causing possible
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// crashes.
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defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(100))
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var stop uint32
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defer atomic.StoreUint32(&stop, 1) // in case of panic
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var wg sync.WaitGroup
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for i := 0; i < 4; i++ {
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wg.Add(1)
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go func() {
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for atomic.LoadUint32(&stop) == 0 {
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syscall.Close(-1)
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}
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wg.Done()
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}()
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}
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max := 10000
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if testing.Short() {
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max = 100
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}
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stk := make([]runtime.StackRecord, 128)
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for n := 0; n < max; n++ {
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_, ok := runtime.GoroutineProfile(stk)
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if !ok {
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t.Fatalf("GoroutineProfile failed")
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}
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}
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// If the program didn't crash, we passed.
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atomic.StoreUint32(&stop, 1)
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wg.Wait()
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}
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