63   markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p);
  64   markOop curMark;
  65 
  66   assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable");
  67   assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this.");
  68 
  69   while (!oldMark->is_marked()) {
  70     curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark);
  71     assert(is_forwarded(), "object should have been forwarded");
  72     if (curMark == oldMark) {
  73       return NULL;
  74     }
  75     // If the CAS was unsuccessful then curMark->is_marked()
  76     // should return true as another thread has CAS'd in another
  77     // forwarding pointer.
  78     oldMark = curMark;
  79   }
  80   return forwardee();
  81 }
  82 
  83 inline void oopDesc::update_header(ParCompactionManager* cm) {
  84   PSParallelCompact::adjust_klass(cm, klass());
  85 }
  86 
  87 #endif // SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP

  63   markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p);
  64   markOop curMark;
  65 
  66   assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable");
  67   assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this.");
  68 
  69   while (!oldMark->is_marked()) {
  70     curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark);
  71     assert(is_forwarded(), "object should have been forwarded");
  72     if (curMark == oldMark) {
  73       return NULL;
  74     }
  75     // If the CAS was unsuccessful then curMark->is_marked()
  76     // should return true as another thread has CAS'd in another
  77     // forwarding pointer.
  78     oldMark = curMark;
  79   }
  80   return forwardee();
  81 }
  82 




  83 #endif // SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP