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runtime: preempt long-running goroutines

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If a goroutine runs for more than 10ms, preempt it.
Update #543.

R=rsc
CC=golang-dev
https://golang.org/cl/10796043
This commit is contained in:
Dmitriy Vyukov 2013-07-19 01:22:26 +04:00
parent 58f12ffd79
commit bc31bcccd3
3 changed files with 60 additions and 20 deletions
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4
src/pkg/runtime/stack.c
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@ -244,11 +244,11 @@ runtime·newstack(void)
if(gp->stackguard0 == (uintptr)StackPreempt) {
if(gp == m->g0)
runtime·throw("runtime: preempt g0");
if(oldstatus == Grunning && (m->p == nil || m->p->status != Prunning))
if(oldstatus == Grunning && m->p == nil)
runtime·throw("runtime: g is running but p is not");
// Be conservative about where we preempt.
// We are interested in preempting user Go code, not runtime code.
if(oldstatus != Grunning || m->locks || m->mallocing || m->gcing) {
if(oldstatus != Grunning || m->locks || m->mallocing || m->gcing || m->p->status != Prunning) {
// Let the goroutine keep running for now.
// gp->preempt is set, so it will be preempted next time.
gp->stackguard0 = gp->stackguard;