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runtime: prepare for M's running w/o mcache

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Can not happen ATM. In preparation for the new scheduler.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7388043
This commit is contained in:
Dmitriy Vyukov 2013-02-20 21:17:56 +04:00
parent e25f19a638
commit 1e063eea38
1 changed files with 2 additions and 0 deletions
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2
src/pkg/runtime/panic.c
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@ -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);