From: Dmitriy Vyukov <dvyukov@google.com>
Date: Mon, 14 May 2012 15:27:29 +0000 (+0400)
Subject: sync: use atomic.Store in Once.Do
X-Git-Tag: go1.1rc2~3217
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=8c4c6c413facabf44b3ecd1fc44bd887fc710271;p=gostls13.git

sync: use atomic.Store in Once.Do
No perf/semantic changes, merely improves code health.
There were several questions as to why Once.Do uses
atomic.CompareAndSwap to do a store.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6208057
---

diff --git a/src/pkg/sync/once.go b/src/pkg/sync/once.go
index 04b714a3e7..1699e86a9e 100644
--- a/src/pkg/sync/once.go
+++ b/src/pkg/sync/once.go
@@ -38,6 +38,6 @@ func (o *Once) Do(f func()) {
 	defer o.m.Unlock()
 	if o.done == 0 {
 		f()
-		atomic.CompareAndSwapUint32(&o.done, 0, 1)
+		atomic.StoreUint32(&o.done, 1)
 	}
 }