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