From b757d264230d65f988e08158e096a09497d39eb4 Mon Sep 17 00:00:00 2001
From: Ondřej Surý <ondrej@sury.org>
Date: Wed, 3 Aug 2011 17:26:15 +0200
Subject: Imported Upstream version 2011.07.29

---
 src/pkg/sync/once.go | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'src/pkg/sync/once.go')

diff --git a/src/pkg/sync/once.go b/src/pkg/sync/once.go
index 447b71dcb..04b714a3e 100644
--- a/src/pkg/sync/once.go
+++ b/src/pkg/sync/once.go
@@ -11,7 +11,7 @@ import (
 // Once is an object that will perform exactly one action.
 type Once struct {
 	m    Mutex
-	done int32
+	done uint32
 }
 
 // Do calls the function f if and only if the method is being called for the
@@ -30,7 +30,7 @@ type Once struct {
 // Do to be called, it will deadlock.
 //
 func (o *Once) Do(f func()) {
-	if atomic.AddInt32(&o.done, 0) == 1 {
+	if atomic.LoadUint32(&o.done) == 1 {
 		return
 	}
 	// Slow-path.
@@ -38,6 +38,6 @@ func (o *Once) Do(f func()) {
 	defer o.m.Unlock()
 	if o.done == 0 {
 		f()
-		atomic.CompareAndSwapInt32(&o.done, 0, 1)
+		atomic.CompareAndSwapUint32(&o.done, 0, 1)
 	}
 }
-- 
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