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runtime: do not trigger GC on g0

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GC acquires worldsema, which is a goroutine-level semaphore
which parks goroutines. g0 can not be parked.
Fixes #6193.

R=khr, khr
CC=golang-dev
https://golang.org/cl/12880045
This commit is contained in:
Dmitriy Vyukov 2013-08-22 02:17:45 +04:00
parent 87fdb8fb9a
commit dfdd1ba028
2 changed files with 9 additions and 22 deletions
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15
src/pkg/runtime/mgc0.c
View file

@ -1614,12 +1614,7 @@ addroots(void)
case Gdead:
break;
case Grunning:
if(gp != m->curg)
runtime·throw("mark - world not stopped");
if(g != m->g0)
runtime·throw("gc not on g0");
addstackroots(gp);
break;
case Grunnable:
case Gsyscall:
case Gwaiting:
@ -2046,7 +2041,7 @@ runtime·gc(int32 force)
// problems, don't bother trying to run gc
// while holding a lock. The next mallocgc
// without a lock will do the gc instead.
if(!mstats.enablegc || m->locks > 0 || runtime·panicking)
if(!mstats.enablegc || g == m->g0 || m->locks > 0 || runtime·panicking)
return;
if(gcpercent == GcpercentUnknown) { // first time through
@ -2077,16 +2072,11 @@ runtime·gc(int32 force)
// we don't need to scan gc's internal state). Also an
// enabler for copyable stacks.
for(i = 0; i < (runtime·debug.gctrace > 1 ? 2 : 1); i++) {
if(g == m->g0) {
// already on g0
gc(&a);
} else {
// switch to g0, call gc(&a), then switch back
g->param = &a;
g->status = Gwaiting;
g->waitreason = "garbage collection";
runtime·mcall(mgc);
}
// record a new start time in case we're going around again
a.start_time = runtime·nanotime();
}
@ -2110,10 +2100,7 @@ runtime·gc(int32 force)
}
runtime·unlock(&finlock);
}
if(g->preempt) // restore the preemption request in case we've cleared it in newstack
g->stackguard0 = StackPreempt;
// give the queued finalizers, if any, a chance to run
if(g != m->g0)
runtime·gosched();
}

2
src/pkg/runtime/stack.c
View file

@ -105,7 +105,7 @@ runtime·stackalloc(uint32 n)
m->stackinuse++;
return v;
}
return runtime·mallocgc(n, 0, FlagNoProfiling|FlagNoGC|FlagNoZero);
return runtime·mallocgc(n, 0, FlagNoProfiling|FlagNoGC|FlagNoZero|FlagNoInvokeGC);
}
void