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