From 1fa0a8cec5f46bee1d652202934665a2ecdfc8d6 Mon Sep 17 00:00:00 2001
From: Mikio Hara <mikioh.mikioh@gmail.com>
Date: Mon, 1 Jun 2015 13:25:03 +0900
Subject: [PATCH] runtime: fix data race in BenchmarkChanPopular

Fixes #11014.

Change-Id: I9a18dacd10564d3eaa1fea4d77f1a48e08e79f53
Reviewed-on: https://go-review.googlesource.com/10563
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
---
 src/runtime/chan_test.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/runtime/chan_test.go b/src/runtime/chan_test.go
index 9119371d5c..497e87f43d 100644
--- a/src/runtime/chan_test.go
+++ b/src/runtime/chan_test.go
@@ -898,6 +898,8 @@ func BenchmarkChanPopular(b *testing.B) {
 	const n = 1000
 	c := make(chan bool)
 	var a []chan bool
+	var wg sync.WaitGroup
+	wg.Add(n)
 	for j := 0; j < n; j++ {
 		d := make(chan bool)
 		a = append(a, d)
@@ -908,6 +910,7 @@ func BenchmarkChanPopular(b *testing.B) {
 				case <-d:
 				}
 			}
+			wg.Done()
 		}()
 	}
 	for i := 0; i < b.N; i++ {
@@ -915,4 +918,5 @@ func BenchmarkChanPopular(b *testing.B) {
 			d <- true
 		}
 	}
+	wg.Wait()
 }