--- a/src/hotspot/share/runtime/mutex.cpp Wed Jan 03 17:29:20 2018 +0000
+++ b/src/hotspot/share/runtime/mutex.cpp Thu Jan 04 18:18:18 2018 -0500
@@ -467,7 +467,7 @@
OrderAccess::fence();
// Optional optimization ... try barging on the inner lock
- if ((NativeMonitorFlags & 32) && Atomic::cmpxchg(ESelf, &_OnDeck, (ParkEvent*)NULL) == NULL) {
+ if ((NativeMonitorFlags & 32) && Atomic::replace_if_null(ESelf, &_OnDeck)) {
goto OnDeck_LOOP;
}
@@ -574,7 +574,7 @@
// Unlike a normal lock, however, the exiting thread "locks" OnDeck,
// picks a successor and marks that thread as OnDeck. That successor
// thread will then clear OnDeck once it eventually acquires the outer lock.
- if (Atomic::cmpxchg((ParkEvent*)_LBIT, &_OnDeck, (ParkEvent*)NULL) != NULL) {
+ if (!Atomic::replace_if_null((ParkEvent*)_LBIT, &_OnDeck)) {
return;
}