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

*** 192,202 ****
  HeapWord* MutableSpace::cas_allocate(size_t size) {
    do {
      HeapWord* obj = top();
      if (pointer_delta(end(), obj) >= size) {
        HeapWord* new_top = obj + size;
!       HeapWord* result = Atomic::cmpxchg(new_top, top_addr(), obj);
        // result can be one of two:
        //  the old top value: the exchange succeeded
        //  otherwise: the new value of the top is returned.
        if (result != obj) {
          continue; // another thread beat us to the allocation, try again
--- 192,202 ----
  HeapWord* MutableSpace::cas_allocate(size_t size) {
    do {
      HeapWord* obj = top();
      if (pointer_delta(end(), obj) >= size) {
        HeapWord* new_top = obj + size;
!       HeapWord* result = Atomic::cmpxchg(top_addr(), obj, new_top);
        // result can be one of two:
        //  the old top value: the exchange succeeded
        //  otherwise: the new value of the top is returned.
        if (result != obj) {
          continue; // another thread beat us to the allocation, try again
*** 211,221 ****
  }
  
  // Try to deallocate previous allocation. Returns true upon success.
  bool MutableSpace::cas_deallocate(HeapWord *obj, size_t size) {
    HeapWord* expected_top = obj + size;
!   return Atomic::cmpxchg(obj, top_addr(), expected_top) == expected_top;
  }
  
  void MutableSpace::oop_iterate(OopIterateClosure* cl) {
    HeapWord* obj_addr = bottom();
    HeapWord* t = top();
--- 211,221 ----
  }
  
  // Try to deallocate previous allocation. Returns true upon success.
  bool MutableSpace::cas_deallocate(HeapWord *obj, size_t size) {
    HeapWord* expected_top = obj + size;
!   return Atomic::cmpxchg(top_addr(), expected_top, obj) == expected_top;
  }
  
  void MutableSpace::oop_iterate(OopIterateClosure* cl) {
    HeapWord* obj_addr = bottom();
    HeapWord* t = top();