tree ce8ecd018c7422fd48ae571c50d62bdb0fc5bb31
parent 222f371118754382145735186fe3aedfca16d5f4
author Austin Clements <austin@google.com> 1427212284 -0400
committer Austin Clements <austin@google.com> 1427383589 +0000

runtime: remove write barrier on G in sighandler

sighandler may run during a stop-the-world without a P, so it's not
allowed to have write barriers. Fix the G write to disable the write
barrier (this is safe because the G is reachable from allgs) and mark
the function nowritebarrier.

Change-Id: I907f05d3829e24eeb15fa4d020598af36710e87e
Reviewed-on: https://go-review.googlesource.com/8020
Reviewed-by: Rick Hudson <rlh@golang.org>