src/hotspot/share/utilities/lockFreeStack.hpp

@@ -63,11 +63,11 @@
     T* cur = top();
     T* old;
     do {
       old = cur;
       set_next(*last, cur);
-      cur = Atomic::cmpxchg(first, &_top, cur);
+      cur = Atomic::cmpxchg(&_top, cur, first);
     } while (old != cur);
   }
 
   // Noncopyable.
   LockFreeStack(const LockFreeStack&);

@@ -89,11 +89,11 @@
       T* new_top = NULL;
       if (result != NULL) {
         new_top = next(*result);
       }
       // CAS even on empty pop, for consistent membar bahavior.
-      result = Atomic::cmpxchg(new_top, &_top, result);
+      result = Atomic::cmpxchg(&_top, result, new_top);
     } while (result != old);
     if (result != NULL) {
       set_next(*result, NULL);
     }
     return result;