202     void push_front(const Block& block);

   202     void push_front(const Block& block);

   203     void push_back(const Block& block);

   203     void push_back(const Block& block);

   204     void unlink(const Block& block);

   204     void unlink(const Block& block);

   205   };

   205   };

   206 

   206 

   220 private:

   207 private:

   221   const char* _name;

   208   const char* _name;

   222   ActiveArray* _active_array;

   209   ActiveArray* _active_array;

   223   AllocateList _allocate_list;

   210   AllocateList _allocate_list;

   224   Block* volatile _deferred_updates;

   211   Block* volatile _deferred_updates;

   226   Mutex* _allocate_mutex;

   213   Mutex* _allocate_mutex;

   227   Mutex* _active_mutex;

   214   Mutex* _active_mutex;

   228 

   215 

   229   // Volatile for racy unlocked accesses.

   216   // Volatile for racy unlocked accesses.

   230   volatile size_t _allocation_count;

   217   volatile size_t _allocation_count;

   234 

   218 

   235   // mutable because this gets set even for const iteration.

   219   // mutable because this gets set even for const iteration.

   236   mutable bool _concurrent_iteration_active;

   220   mutable bool _concurrent_iteration_active;

   237 

   221 

   238   Block* find_block_or_null(const oop* ptr) const;

   222   Block* find_block_or_null(const oop* ptr) const;