392336f94e
handoffp by definition runs without a P, so it's not allowed to have write barriers. It doesn't have any right now, but mark it nowritebarrier to disallow any creeping in in the future. handoffp in turns calls startm, newm, and newosproc, all of which are "below Go" and make sense to run without a P, so disallow write barriers in these as well. For most functions, we've done this because they may race with stoptheworld() and hence must not have write barriers. For these functions, it's a little different: the world can't stop while we're in handoffp, so this race isn't present. But we implement this restriction with a somewhat broader rule that you can't have a write barrier without a P. We like this rule because it's simple and means that our write barriers can depend on there being a P, even though this rule is actually a little broader than necessary. Hence, even though there's no danger of the race in these functions, we want to adhere to the broader rule. Change-Id: Ie22319c30eea37d703eb52f5c7ca5da872030b88 Reviewed-on: https://go-review.googlesource.com/8130 Run-TryBot: Austin Clements <austin@google.com> Reviewed-by: Minux Ma <minux@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rick Hudson <rlh@golang.org> |
||
|---|---|---|
| api | ||
| doc | ||
| lib/time | ||
| misc | ||
| src | ||
| test | ||
| .gitattributes | ||
| .gitignore | ||
| AUTHORS | ||
| CONTRIBUTING.md | ||
| CONTRIBUTORS | ||
| favicon.ico | ||
| LICENSE | ||
| PATENTS | ||
| README.md | ||
| robots.txt | ||
The Go Programming Language
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
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.