Synchronize store buffer processing and concurrent sweeping.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4789 matching lines @@
 
 
 // FreeSpace represents fixed sized areas of the heap that are not currently in
 // use.  Used by the heap and GC.
 class FreeSpace: public HeapObject {
  public:
   // [size]: size of the free space including the header.
   inline int size();
   inline void set_size(int value);
 
+  inline int synchronized_size();
+  inline void synchronized_set_size(int value);
+
   inline int Size() { return size(); }
 
   // Casting.
   static inline FreeSpace* cast(Object* obj);
 
   // Dispatched behavior.
   DECLARE_PRINTER(FreeSpace)
   DECLARE_VERIFIER(FreeSpace)
 
   // Layout description.
@@ skipping 6170 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_