mirror of https://github.com/golang/go.git
91e8554b8b
This change prevents confusion in the garbage collector. The collector wants to make sure that every pointer it finds isn't junk. Its criteria for junk is (among others) points to a "free" span. Because the stack shrinker modifies pointers in the heap, there is a race condition between the GC scanner and the shrinker. The GC scanner can see old pointers (pointers to freed stacks). In particular this happens with SudoG.elem pointers. Normally this is not a problem, as pointers into stack spans are ok. But if the freed stack is the last one in its span, the span is marked as "free" instead of "contains stacks". This change makes sure that even if the GC scanner sees an old pointer, the span into which it points is still marked as "contains stacks", and thus the GC doesn't complain about it. This change will make the GC pause a tiny bit slower, as the stack freeing now happens in serial with the mark pause. We could delay the freeing until the mutators start back up, but this is the simplest change for now. TBR=dvyukov CC=golang-codereviews https://golang.org/cl/158750043 |
||
|---|---|---|
| api | ||
| doc | ||
| include | ||
| lib | ||
| misc | ||
| src | ||
| test | ||
| .hgignore | ||
| .hgtags | ||
| AUTHORS | ||
| CONTRIBUTORS | ||
| LICENSE | ||
| PATENTS | ||
| README | ||
| favicon.ico | ||
| robots.txt | ||
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-source.html
in your web browser.
After installing Go, you can view a nicely formatted
doc/install-source.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install/source.
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.