// 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)
}
}