sync: restore GOMAXPROCS during benchmarks

R=golang-dev CC=dvyukov, golang-dev https://golang.org/cl/4631060

sync: restore GOMAXPROCS during benchmarks
R=golang-dev CC=dvyukov, golang-dev https://golang.org/cl/4631060
8cab7f57 · Dmitriy Vyukov · Russ Cox · 89d334ff · 8cab7f57
Commit 8cab7f57 authored Jun 22, 2011 by Dmitriy Vyukov Committed by Russ Cox Jun 22, 2011
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mutex_test.go src/pkg/sync/mutex_test.go +2 -2

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--- a/src/pkg/sync/mutex_test.go
+++ b/src/pkg/sync/mutex_test.go
@@ -43,7 +43,7 @@ func BenchmarkContendedSemaphore(b *testing.B) {
 	s := new(uint32)
 	*s = 1
 	c := make(chan bool)
-	runtime.GOMAXPROCS(2)
+	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(2))
 	b.StartTimer()

 	go HammerSemaphore(s, b.N/2, c)
@@ -81,7 +81,7 @@ func BenchmarkContendedMutex(b *testing.B) {
 	b.StopTimer()
 	m := new(Mutex)
 	c := make(chan bool)
-	runtime.GOMAXPROCS(2)
+	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(2))
 	b.StartTimer()

 	go HammerMutex(m, b.N/2, c)