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go/src/runtime/futex_test.go
Brad Fitzpatrick 519474451a all: make copyright headers consistent with one space after period
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>
2016-03-01 23:34:33 +00:00

89 lines
2.1 KiB
Go

// 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.
// Futex is only available on DragonFly BSD, FreeBSD and Linux.
// The race detector emits calls to split stack functions so it breaks
// the test.
// +build dragonfly freebsd linux
// +build !race
package runtime_test
import (
"runtime"
"sync"
"sync/atomic"
"testing"
"time"
)
type futexsleepTest struct {
mtx uint32
ns int64
msg string
ch chan *futexsleepTest
}
var futexsleepTests = []futexsleepTest{
beforeY2038: {mtx: 0, ns: 86400 * 1e9, msg: "before the year 2038"},
afterY2038: {mtx: 0, ns: (1<<31 + 100) * 1e9, msg: "after the year 2038"},
}
const (
beforeY2038 = iota
afterY2038
)
func TestFutexsleep(t *testing.T) {
if runtime.GOMAXPROCS(0) > 1 {
// futexsleep doesn't handle EINTR or other signals,
// so spurious wakeups may happen.
t.Skip("skipping; GOMAXPROCS>1")
}
start := time.Now()
var wg sync.WaitGroup
for i := range futexsleepTests {
tt := &futexsleepTests[i]
tt.mtx = 0
tt.ch = make(chan *futexsleepTest, 1)
wg.Add(1)
go func(tt *futexsleepTest) {
runtime.Entersyscall(0)
runtime.Futexsleep(&tt.mtx, 0, tt.ns)
runtime.Exitsyscall(0)
tt.ch <- tt
wg.Done()
}(tt)
}
loop:
for {
select {
case tt := <-futexsleepTests[beforeY2038].ch:
t.Errorf("futexsleep test %q finished early after %s", tt.msg, time.Since(start))
break loop
case tt := <-futexsleepTests[afterY2038].ch:
// Looks like FreeBSD 10 kernel has changed
// the semantics of timedwait on userspace
// mutex to make broken stuff look broken.
switch {
case runtime.GOOS == "freebsd" && runtime.GOARCH == "386":
t.Log("freebsd/386 may not work correctly after the year 2038, see golang.org/issue/7194")
default:
t.Errorf("futexsleep test %q finished early after %s", tt.msg, time.Since(start))
break loop
}
case <-time.After(time.Second):
break loop
}
}
for i := range futexsleepTests {
tt := &futexsleepTests[i]
atomic.StoreUint32(&tt.mtx, 1)
runtime.Futexwakeup(&tt.mtx, 1)
}
wg.Wait()
}