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runtime: properly synchronize GC and finalizer goroutine
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
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@ -2030,18 +2030,6 @@ gc(struct gc_args *args)
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mstats.next_gc = mstats.heap_alloc+mstats.heap_alloc*gcpercent/100;
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m->gcing = 0;
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if(finq != nil) {
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m->locks++; // disable gc during the mallocs in newproc
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// kick off or wake up goroutine to run queued finalizers
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if(fing == nil)
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fing = runtime·newproc1(&runfinqv, nil, 0, 0, runtime·gc);
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else if(fingwait) {
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fingwait = 0;
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runtime·ready(fing);
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}
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m->locks--;
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}
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heap1 = mstats.heap_alloc;
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obj1 = mstats.nmalloc - mstats.nfree;
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@ -2089,9 +2077,19 @@ gc(struct gc_args *args)
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runtime·semrelease(&runtime·worldsema);
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runtime·starttheworld();
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// give the queued finalizers, if any, a chance to run
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if(finq != nil)
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if(finq != nil) {
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runtime·lock(&finlock);
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// kick off or wake up goroutine to run queued finalizers
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if(fing == nil)
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fing = runtime·newproc1(&runfinqv, nil, 0, 0, runtime·gc);
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else if(fingwait) {
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fingwait = 0;
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runtime·ready(fing);
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}
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runtime·unlock(&finlock);
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// give the queued finalizers, if any, a chance to run
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runtime·gosched();
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}
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}
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void
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@ -2176,19 +2174,15 @@ runfinq(void)
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frame = nil;
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framecap = 0;
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for(;;) {
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// There's no need for a lock in this section
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// because it only conflicts with the garbage
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// collector, and the garbage collector only
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// runs when everyone else is stopped, and
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// runfinq only stops at the gosched() or
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// during the calls in the for loop.
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runtime·lock(&finlock);
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fb = finq;
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finq = nil;
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if(fb == nil) {
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fingwait = 1;
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runtime·park(nil, nil, "finalizer wait");
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runtime·park(runtime·unlock, &finlock, "finalizer wait");
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continue;
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}
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runtime·unlock(&finlock);
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if(raceenabled)
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runtime·racefingo();
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for(; fb; fb=next) {
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