From: Dmitriy Vyukov <dvyukov@google.com>
Date: Wed, 20 Feb 2013 17:17:56 +0000 (+0400)
Subject: runtime: prepare for M's running w/o mcache
X-Git-Tag: go1.1rc2~949
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=1e063eea38fe3ecc8bea4e35bc0482fa8100ea80;p=gostls13.git

runtime: prepare for M's running w/o mcache
Can not happen ATM. In preparation for the new scheduler.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7388043
---

diff --git a/src/pkg/runtime/panic.c b/src/pkg/runtime/panic.c
index a0651e4ad5..603ff62eb3 100644
--- a/src/pkg/runtime/panic.c
+++ b/src/pkg/runtime/panic.c
@@ -382,6 +382,8 @@ nomatch:
 void
 runtime·startpanic(void)
 {
+	if(m->mcache == nil)  // can happen if called from signal handler or throw
+		m->mcache = runtime·allocmcache();
 	if(m->dying) {
 		runtime·printf("panic during panic\n");
 		runtime·exit(3);