From 683311175c83dc013030e23c4826fa95b59048ea Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Mon, 13 Jul 2015 15:23:59 -0400
Subject: [PATCH] runtime: fix race in TestChanSendBarrier

Fixes race detector build.

Change-Id: I8bdc78d57487580e6b5b8c415df4653a1ba69e37
Reviewed-on: https://go-review.googlesource.com/12087
Reviewed-by: Austin Clements <austin@google.com>
---
 src/runtime/chanbarrier_test.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/runtime/chanbarrier_test.go b/src/runtime/chanbarrier_test.go
index c48fd3c965..770b850f87 100644
--- a/src/runtime/chanbarrier_test.go
+++ b/src/runtime/chanbarrier_test.go
@@ -54,6 +54,7 @@ func TestChanSendBarrier(t *testing.T) {
 
 func testChanSendBarrier(useSelect bool) {
 	var wg sync.WaitGroup
+	var globalMu sync.Mutex
 	outer := 100
 	inner := 100000
 	if testing.Short() {
@@ -73,7 +74,9 @@ func testChanSendBarrier(useSelect bool) {
 				}
 				garbage = make([]byte, 1<<10)
 			}
+			globalMu.Lock()
 			global = garbage
+			globalMu.Unlock()
 		}()
 	}
 	wg.Wait()