66 lines
1.6 KiB
Go
66 lines
1.6 KiB
Go
// Copyright 2018 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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//+build !nacl,!plan9,!windows,!js
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package runtime_test
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import (
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"os/exec"
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"syscall"
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"testing"
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"time"
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)
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// Issue #27250. Spurious wakeups to pthread_cond_timedwait_relative_np
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// shouldn't cause semasleep to retry with the same timeout which would
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// cause indefinite spinning.
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func TestSpuriousWakeupsNeverHangSemasleep(t *testing.T) {
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if *flagQuick {
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t.Skip("-quick")
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}
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exe, err := buildTestProg(t, "testprog")
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if err != nil {
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t.Fatal(err)
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}
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start := time.Now()
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cmd := exec.Command(exe, "After1")
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if err := cmd.Start(); err != nil {
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t.Fatalf("Failed to start command: %v", err)
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}
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doneCh := make(chan error, 1)
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go func() {
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doneCh <- cmd.Wait()
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}()
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// With the repro running, we can continuously send to it
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// a non-terminal signal such as SIGIO, to spuriously
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// wakeup pthread_cond_timedwait_relative_np.
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unfixedTimer := time.NewTimer(2 * time.Second)
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for {
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select {
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case <-time.After(200 * time.Millisecond):
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// Send the pesky signal that toggles spinning
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// indefinitely if #27520 is not fixed.
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cmd.Process.Signal(syscall.SIGIO)
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case <-unfixedTimer.C:
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t.Error("Program failed to return on time and has to be killed, issue #27520 still exists")
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cmd.Process.Signal(syscall.SIGKILL)
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return
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case err := <-doneCh:
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if err != nil {
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t.Fatalf("The program returned but unfortunately with an error: %v", err)
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}
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if time.Since(start) < 100*time.Millisecond {
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t.Fatalf("The program stopped too quickly.")
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}
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return
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}
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}
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}
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