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runtime: fix scheduling race

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Affects programs using cgo or runtime.LockOSThread.

Fixes #2100.

R=rsc, dvyukov
CC=golang-dev
https://golang.org/cl/4810059
This commit is contained in:
Hector Chu 2011-07-29 17:39:02 -04:00 committed by Russ Cox
parent 31442a6737
commit 9bc58accce
1 changed files with 9 additions and 1 deletions
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10
src/pkg/runtime/proc.c
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@ -486,8 +486,16 @@ nextgandunlock(void)
// We can only run one g, and it's not available. // We can only run one g, and it's not available.
// Make sure some other cpu is running to handle // Make sure some other cpu is running to handle
// the ordinary run queue. // the ordinary run queue.
if(runtime·sched.gwait != 0) if(runtime·sched.gwait != 0) {
matchmg(); matchmg();
// m->lockedg might have been on the queue.
if(m->nextg != nil) {
gp = m->nextg;
m->nextg = nil;
schedunlock();
return gp;
}
}
} else { } else {
// Look for work on global queue. // Look for work on global queue.
while(haveg() && canaddmcpu()) { while(haveg() && canaddmcpu()) {