55 // not otherwise protect the queue content.
  56 //
  57 class G1StringDedupQueue : public CHeapObj<mtGC> {
  58 private:
  59   typedef Stack<oop, mtGC> G1StringDedupWorkerQueue;
  60 
  61   static G1StringDedupQueue* _queue;
  62   static const size_t        _max_size;
  63   static const size_t        _max_cache_size;
  64 
  65   G1StringDedupWorkerQueue*  _queues;
  66   size_t                     _nqueues;
  67   size_t                     _cursor;
  68   bool                       _cancel;
  69   volatile bool              _empty;
  70 
  71   // Statistics counter, only used for logging.
  72   uintx                      _dropped;
  73 
  74   G1StringDedupQueue();

  75   ~G1StringDedupQueue();
  76 
  77   static void unlink_or_oops_do(G1StringDedupUnlinkOrOopsDoClosure* cl, size_t queue);
  78 
  79 public:
  80   static void create();
  81 
  82   // Blocks and waits for the queue to become non-empty.
  83   static void wait();
  84 
  85   // Wakes up any thread blocked waiting for the queue to become non-empty.
  86   static void cancel_wait();
  87 
  88   // Pushes a deduplication candidate onto a specific GC worker queue.
  89   static void push(uint worker_id, oop java_string);
  90 
  91   // Pops a deduplication candidate from any queue, returns NULL if
  92   // all queues are empty.
  93   static oop pop();
  94 

  55 // not otherwise protect the queue content.
  56 //
  57 class G1StringDedupQueue : public CHeapObj<mtGC> {
  58 private:
  59   typedef Stack<oop, mtGC> G1StringDedupWorkerQueue;
  60 
  61   static G1StringDedupQueue* _queue;
  62   static const size_t        _max_size;
  63   static const size_t        _max_cache_size;
  64 
  65   G1StringDedupWorkerQueue*  _queues;
  66   size_t                     _nqueues;
  67   size_t                     _cursor;
  68   bool                       _cancel;
  69   volatile bool              _empty;
  70 
  71   // Statistics counter, only used for logging.
  72   uintx                      _dropped;
  73 
  74   G1StringDedupQueue();
  75   // Never called.
  76   ~G1StringDedupQueue();
  77 
  78   static void unlink_or_oops_do(G1StringDedupUnlinkOrOopsDoClosure* cl, size_t queue);
  79 
  80 public:
  81   static void create();
  82 
  83   // Blocks and waits for the queue to become non-empty.
  84   static void wait();
  85 
  86   // Wakes up any thread blocked waiting for the queue to become non-empty.
  87   static void cancel_wait();
  88 
  89   // Pushes a deduplication candidate onto a specific GC worker queue.
  90   static void push(uint worker_id, oop java_string);
  91 
  92   // Pops a deduplication candidate from any queue, returns NULL if
  93   // all queues are empty.
  94   static oop pop();
  95