Commit a594f7dd authored by Mikio Hara's avatar Mikio Hara

runtime: fix futexsleep test on freebsd/386

Fixes #7194.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/72310043
parent e09ac3cf
......@@ -2,33 +2,70 @@
// 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, FreeBSD and Linux.
// The race detector emits calls to split stack functions so it breaks the test.
// 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"
"runtime"
"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", ch: make(chan futexsleepTest, 1)},
afterY2038: {mtx: 0, ns: (1<<31 + 100) * 1e9, msg: "after the year 2038", ch: make(chan futexsleepTest, 1)},
}
const (
beforeY2038 = iota
afterY2038
)
func TestFutexsleep(t *testing.T) {
ch := make(chan bool, 1)
var dummy uint32
start := time.Now()
go func() {
Entersyscall()
Futexsleep(&dummy, 0, (1<<31+100)*1e9)
Exitsyscall()
ch <- true
}()
select {
case <-ch:
t.Errorf("futexsleep finished early after %s!", time.Since(start))
case <-time.After(time.Second):
Futexwakeup(&dummy, 1)
for _, tt := range futexsleepTests {
go func(tt futexsleepTest) {
runtime.Entersyscall()
runtime.Futexsleep(&tt.mtx, tt.mtx, tt.ns)
runtime.Exitsyscall()
tt.ch <- tt
}(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 _, tt := range futexsleepTests {
runtime.Futexwakeup(&tt.mtx, 1)
}
}
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