f5d494bbdf
Currently its possible for the garbage collector to observe uninitialized memory or stale heap bitmap bits on weakly ordered architectures such as ARM and PPC. On such architectures, the stores that zero newly allocated memory and initialize its heap bitmap may move after a store in user code that makes the allocated object observable by the garbage collector. To fix this, add a "publication barrier" (also known as an "export barrier") before returning from mallocgc. This is a store/store barrier that ensures any write done by user code that makes the returned object observable to the garbage collector will be ordered after the initialization performed by mallocgc. No barrier is necessary on the reading side because of the data dependency between loading the pointer and loading the contents of the object. Fixes one of the issues raised in #9984. Change-Id: Ia3d96ad9c5fc7f4d342f5e05ec0ceae700cd17c8 Reviewed-on: https://go-review.googlesource.com/11083 Reviewed-by: Rick Hudson <rlh@golang.org> Reviewed-by: Dmitry Vyukov <dvyukov@google.com> Reviewed-by: Minux Ma <minux@golang.org> Reviewed-by: Martin Capitanio <capnm9@gmail.com> Reviewed-by: Russ Cox <rsc@golang.org> |
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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.
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.