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519474451a
This is a subset of https://golang.org/cl/20022 with only the copyright header lines, so the next CL will be smaller and more reviewable. Go policy has been single space after periods in comments for some time. The copyright header template at: https://golang.org/doc/contribute.html#copyright also uses a single space. Make them all consistent. Change-Id: Icc26c6b8495c3820da6b171ca96a74701b4a01b0 Reviewed-on: https://go-review.googlesource.com/20111 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
89 lines
2.1 KiB
Go
89 lines
2.1 KiB
Go
// 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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// Futex is only available on DragonFly BSD, FreeBSD and Linux.
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// The race detector emits calls to split stack functions so it breaks
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// the test.
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// +build dragonfly freebsd linux
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// +build !race
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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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"testing"
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"time"
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)
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type futexsleepTest struct {
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mtx uint32
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ns int64
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msg string
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ch chan *futexsleepTest
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}
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var futexsleepTests = []futexsleepTest{
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beforeY2038: {mtx: 0, ns: 86400 * 1e9, msg: "before the year 2038"},
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afterY2038: {mtx: 0, ns: (1<<31 + 100) * 1e9, msg: "after the year 2038"},
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}
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const (
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beforeY2038 = iota
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afterY2038
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)
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func TestFutexsleep(t *testing.T) {
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if runtime.GOMAXPROCS(0) > 1 {
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// futexsleep doesn't handle EINTR or other signals,
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// so spurious wakeups may happen.
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t.Skip("skipping; GOMAXPROCS>1")
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}
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start := time.Now()
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var wg sync.WaitGroup
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for i := range futexsleepTests {
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tt := &futexsleepTests[i]
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tt.mtx = 0
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tt.ch = make(chan *futexsleepTest, 1)
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wg.Add(1)
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go func(tt *futexsleepTest) {
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runtime.Entersyscall(0)
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runtime.Futexsleep(&tt.mtx, 0, tt.ns)
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runtime.Exitsyscall(0)
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tt.ch <- tt
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wg.Done()
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}(tt)
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}
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loop:
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for {
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select {
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case tt := <-futexsleepTests[beforeY2038].ch:
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t.Errorf("futexsleep test %q finished early after %s", tt.msg, time.Since(start))
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break loop
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case tt := <-futexsleepTests[afterY2038].ch:
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// Looks like FreeBSD 10 kernel has changed
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// the semantics of timedwait on userspace
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// mutex to make broken stuff look broken.
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switch {
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case runtime.GOOS == "freebsd" && runtime.GOARCH == "386":
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t.Log("freebsd/386 may not work correctly after the year 2038, see golang.org/issue/7194")
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default:
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t.Errorf("futexsleep test %q finished early after %s", tt.msg, time.Since(start))
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break loop
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}
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case <-time.After(time.Second):
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break loop
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}
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}
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for i := range futexsleepTests {
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tt := &futexsleepTests[i]
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atomic.StoreUint32(&tt.mtx, 1)
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runtime.Futexwakeup(&tt.mtx, 1)
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}
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wg.Wait()
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}
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