src/hotspot/share/runtime/mutex.cpp

rev 47408 : [mq]: no_cmpxchg_if_null
rev 47407 : [mq]: casptr
rev 47406 : [mq]: assembler_cmpxchg
rev 47404 : [mq]: load_ptr_acquire
rev 47400 : [mq]: cmpxchg_ptr
rev 47398 : 8188813: Generalize OrderAccess to use templates
Reviewed-by: dholmes, coleenp
rev 47216 : 8187443: Forest Consolidation: Move files to unified layout
Reviewed-by: darcy, ihse

*** 455,465 ****
    // LockWord encoding = (cxq,LOCKBYTE)
    ESelf->reset();
    OrderAccess::fence();
  
    // Optional optimization ... try barging on the inner lock
!   if ((NativeMonitorFlags & 32) && Atomic::cmpxchg_if_null(ESelf, &_OnDeck)) {
      goto OnDeck_LOOP;
    }
  
    if (AcquireOrPush(ESelf)) goto Exeunt;
  
--- 455,465 ----
    // LockWord encoding = (cxq,LOCKBYTE)
    ESelf->reset();
    OrderAccess::fence();
  
    // Optional optimization ... try barging on the inner lock
!   if ((NativeMonitorFlags & 32) && Atomic::cmpxchg(ESelf, &_OnDeck, (ParkEvent*)NULL) == NULL) {
      goto OnDeck_LOOP;
    }
  
    if (AcquireOrPush(ESelf)) goto Exeunt;
  
*** 562,572 ****
    // but only one concurrent consumer (detacher of RATs).
    // Consider protecting this critical section with schedctl on Solaris.
    // 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_if_null((ParkEvent*)_LBIT, &_OnDeck)) {
      return;
    }
  
    ParkEvent * List = _EntryList;
    if (List != NULL) {
--- 562,572 ----
    // but only one concurrent consumer (detacher of RATs).
    // Consider protecting this critical section with schedctl on Solaris.
    // 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) {
      return;
    }
  
    ParkEvent * List = _EntryList;
    if (List != NULL) {