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07cb48c31f
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Dmitriy Vyukov 07cb48c31f sync: fix race instrumentation of WaitGroup 
Currently more than 1 gorutine can execute raceWrite() in Wait()
in the following scenario:
1. goroutine 1 executes first check of wg.counter, sees that it's == 0
2. goroutine 2 executes first check of wg.counter, sees that it's == 0
3. goroutine 2 locks the mutex, sees that he is the first waiter and executes raceWrite()
4. goroutine 2 block on the semaphore
5. goroutine 3 executes Done() and unblocks goroutine 2
6. goroutine 1 lock the mutex, sees that he is the first waiter and executes raceWrite()

It produces the following false report:
WARNING: DATA RACE
Write by goroutine 35:
  sync.raceWrite()
      src/pkg/sync/race.go:41 +0x33
  sync.(*WaitGroup).Wait()
      src/pkg/sync/waitgroup.go:103 +0xae
  command-line-arguments_test.TestNoRaceWaitGroupMultipleWait2()
      src/pkg/runtime/race/testdata/waitgroup_test.go:156 +0x19a
  testing.tRunner()
      src/pkg/testing/testing.go:361 +0x108

Previous write by goroutine 36:
  sync.raceWrite()
      src/pkg/sync/race.go:41 +0x33
  sync.(*WaitGroup).Wait()
      src/pkg/sync/waitgroup.go:103 +0xae
  command-line-arguments_test.func·012()
      src/pkg/runtime/race/testdata/waitgroup_test.go:148 +0x4d

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/10424043
2013-06-25 20:27:19 +04:00
api api: update next.txt 2013-06-14 10:00:07 -07:00
doc spec: fix spec on conversions to match implementations 2013-06-21 16:11:13 -07:00
include build: add intptr typedef for Plan 9 2013-06-04 16:21:04 -07:00
lib godoc: always use local jQuery script 2013-06-07 10:46:56 +10:00
misc misc/{bbedit|IntelliJIDEA|kate}: add missing delete predeclared identifier 2013-06-24 13:17:56 -07:00
src sync: fix race instrumentation of WaitGroup 2013-06-25 20:27:19 +04:00
test test: add shift expression incorrectly rejected by gccgo. 2013-06-25 08:06:34 +02:00
.hgignore hgignore: cleanup obsolete entries. 2013-06-02 11:36:09 +02:00
.hgtags tag go1.1.1 2013-06-13 12:52:02 +10:00
AUTHORS A+C: ChaiShushan (individual CLA) 2013-06-24 13:27:39 +10:00
CONTRIBUTORS A+C: ChaiShushan (individual CLA) 2013-06-24 13:27:39 +10:00
favicon.ico godoc: update favicon 2012-10-11 17:02:36 +11:00
LICENSE doc: update licensing text one more time 2012-03-27 15:09:13 +11:00
PATENTS LICENSE: separate, change PATENTS text 2010-12-06 16:31:59 -05:00
README build: update, streamline documentation for new $GOBIN 2010-08-24 20:00:50 -04:00
robots.txt godoc: serve robots.txt raw 2011-02-19 05:46:20 +11:00

README 

This is the source code repository for the Go programming language.  

For documentation about how to install and use Go,
visit http://golang.org/ or load doc/install.html in your web browser.

After installing Go, you can view a nicely formatted
doc/install.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install.html.

Unless otherwise noted, the Go source files are distributed
under the BSD-style license found in the LICENSE file.

--

Binary Distribution Notes

If you have just untarred a binary Go distribution, you need to set
the environment variable $GOROOT to the full path of the go
directory (the one containing this README).  You can omit the
variable if you unpack it into /usr/local/go, or if you rebuild
from sources by running all.bash (see doc/install.html).
You should also add the Go binary directory $GOROOT/bin
to your shell's path.

For example, if you extracted the tar file into $HOME/go, you might
put the following in your .profile:

    export GOROOT=$HOME/go
    export PATH=$PATH:$GOROOT/bin

See doc/install.html for more details.