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f6d0054e71
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Russ Cox f6d0054e71 runtime: avoid race checking for preemption 
Moving the "don't really preempt" check up earlier in the function
introduced a race where gp.stackguard0 might change between
the early check and the later one. Since the later one is missing the
"don't really preempt" logic, it could decide to preempt incorrectly.
Pull the result of the check into a local variable and use an atomic
to access stackguard0, to eliminate the race.

I believe this will fix the broken OS X and Solaris builders.

Change-Id: I238350dd76560282b0c15a3306549cbcf390dbff
Reviewed-on: https://go-review.googlesource.com/2823
Reviewed-by: Austin Clements <austin@google.com>
2015-01-14 22:20:33 +00:00
api runtime: add GODEBUG=gccheckmark=0/1 2015-01-12 16:36:50 +00:00
doc go1.5.txt: better checking of struct tags 2015-01-12 23:17:41 +00:00
include cmd/9l: support internal linking 2015-01-07 20:35:54 +00:00
lib/time remove the obsolete lib/codereview. 2014-12-08 07:51:54 +00:00
misc cmd/cgo: also rewrite C.var in selector expressions 2015-01-12 21:48:57 +00:00
src runtime: avoid race checking for preemption 2015-01-14 22:20:33 +00:00
test cmd/gc: don't recurse infinitely when a recursive type references itself more than once 2015-01-12 02:09:50 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore all: tighten overly-broad runtime/z* gitignore line 2014-12-10 00:45:47 +00:00
AUTHORS A+C: add another email address for Emil Hessman 2014-11-12 10:01:23 -08:00
CONTRIBUTING.md doc: update README.md and CONTRIBUTING.md in response to review comments 2014-12-10 22:48:34 +00:00
CONTRIBUTORS C: add Nick Cooper (Google CLA). 2014-11-14 17:03:17 +11:00
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README.md README: emphasize that we don't accept pull requests 2015-01-08 18:50:47 +00:00
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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

Our canonical Git repository is located at https://go.googlesource.com/go. (There is a mirror of the repository at https://github.com/golang/go.)

Please report issues here: https://golang.org/issue/new

Go is the work of hundreds of contributors. We appreciate your help!

To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html

Please note that we do not use pull requests.

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 file). 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-source.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 https://golang.org/doc/install or doc/install.html for more details.