src/hotspot/share/gc/parallel/gcTaskThread.cpp

rev 47400 : [mq]: cmpxchg_ptr
rev 47401 : [mq]: cmpxchg_if_null

*** 75,86 ****
  GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) {
    assert(index < GCTaskTimeStampEntries, "Precondition");
    if (_time_stamps == NULL) {
      // We allocate the _time_stamps array lazily since logging can be enabled dynamically
      GCTaskTimeStamp* time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries, mtGC);
!     void* old = Atomic::cmpxchg_ptr(time_stamps, &_time_stamps, NULL);
!     if (old != NULL) {
        // Someone already setup the time stamps
        FREE_C_HEAP_ARRAY(GCTaskTimeStamp, time_stamps);
      }
    }
    return &(_time_stamps[index]);
--- 75,85 ----
  GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) {
    assert(index < GCTaskTimeStampEntries, "Precondition");
    if (_time_stamps == NULL) {
      // We allocate the _time_stamps array lazily since logging can be enabled dynamically
      GCTaskTimeStamp* time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries, mtGC);
!     if (!Atomic::cmpxchg_if_null(time_stamps, &_time_stamps)) {
        // Someone already setup the time stamps
        FREE_C_HEAP_ARRAY(GCTaskTimeStamp, time_stamps);
      }
    }
    return &(_time_stamps[index]);