From: Dmitriy Vyukov <dvyukov@google.com>
Date: Fri, 13 Jan 2012 18:22:03 +0000 (+0400)
Subject: cmd/go: fix data race during build
X-Git-Tag: weekly.2012-01-15~25
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=a4f7024e0af60c548ec1c066ef77e0b2fda2cb21;p=gostls13.git

cmd/go: fix data race during build
Fixes #2695.

R=golang-dev, mpimenov, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/5545052
---

diff --git a/src/cmd/go/build.go b/src/cmd/go/build.go
index 4a046391db..77a64f406e 100644
--- a/src/cmd/go/build.go
+++ b/src/cmd/go/build.go
@@ -873,6 +873,8 @@ func (b *builder) runOut(dir string, desc string, cmdargs ...interface{}) ([]byt
 
 // mkdir makes the named directory.
 func (b *builder) mkdir(dir string) error {
+	b.exec.Lock()
+	defer b.exec.Unlock()
 	// We can be a little aggressive about being
 	// sure directories exist.  Skip repeated calls.
 	if b.mkdirCache[dir] {