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8249560: Shenandoah: Fix racy GC request handling

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Reviewed-by: shade
This commit is contained in:
Roman Kennke 2020-07-16 11:49:04 +02:00
parent 3770be7f70
commit 9694ca9eaf
1 changed files with 4 additions and 2 deletions
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6
src/hotspot/share/gc/shenandoah/shenandoahControlThread.cpp
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@ -511,13 +511,15 @@ void ShenandoahControlThread::handle_requested_gc(GCCause::Cause cause) {
// comes very late in the already running cycle, it would miss lots of new
// opportunities for cleanup that were made available before the caller
// requested the GC.
size_t required_gc_id = get_gc_id() + 1;
MonitorLocker ml(&_gc_waiters_lock);
while (get_gc_id() < required_gc_id) {
size_t current_gc_id = get_gc_id();
size_t required_gc_id = current_gc_id + 1;
while (current_gc_id < required_gc_id) {
_gc_requested.set();
_requested_gc_cause = cause;
ml.wait();
current_gc_id = get_gc_id();
}
}