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runtime: properly synchronize GC and finalizer goroutine

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This is needed for preemptive scheduler, because the goroutine
can be preempted at surprising points.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/9376043
This commit is contained in:
Dmitriy Vyukov 2013-05-22 23:04:46 +04:00
parent 34c67eb24e
commit 72c4ee1a9d
1 changed files with 15 additions and 21 deletions
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36
src/pkg/runtime/mgc0.c
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@ -2030,18 +2030,6 @@ gc(struct gc_args *args)
mstats.next_gc = mstats.heap_alloc+mstats.heap_alloc*gcpercent/100;
m->gcing = 0;
if(finq != nil) {
m->locks++; // disable gc during the mallocs in newproc
// kick off or wake up goroutine to run queued finalizers
if(fing == nil)
fing = runtime·newproc1(&runfinqv, nil, 0, 0, runtime·gc);
else if(fingwait) {
fingwait = 0;
runtime·ready(fing);
}
m->locks--;
}
heap1 = mstats.heap_alloc;
obj1 = mstats.nmalloc - mstats.nfree;
@ -2089,9 +2077,19 @@ gc(struct gc_args *args)
runtime·semrelease(&runtime·worldsema);
runtime·starttheworld();
// give the queued finalizers, if any, a chance to run
if(finq != nil)
if(finq != nil) {
runtime·lock(&finlock);
// kick off or wake up goroutine to run queued finalizers
if(fing == nil)
fing = runtime·newproc1(&runfinqv, nil, 0, 0, runtime·gc);
else if(fingwait) {
fingwait = 0;
runtime·ready(fing);
}
runtime·unlock(&finlock);
// give the queued finalizers, if any, a chance to run
runtime·gosched();
}
}
void
@ -2176,19 +2174,15 @@ runfinq(void)
frame = nil;
framecap = 0;
for(;;) {
// There's no need for a lock in this section
// because it only conflicts with the garbage
// collector, and the garbage collector only
// runs when everyone else is stopped, and
// runfinq only stops at the gosched() or
// during the calls in the for loop.
runtime·lock(&finlock);
fb = finq;
finq = nil;
if(fb == nil) {
fingwait = 1;
runtime·park(nil, nil, "finalizer wait");
runtime·park(runtime·unlock, &finlock, "finalizer wait");
continue;
}
runtime·unlock(&finlock);
if(raceenabled)
runtime·racefingo();
for(; fb; fb=next) {