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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #ifndef V8_SWEEPER_THREAD_H_
     29 #define V8_SWEEPER_THREAD_H_
     30 
     31 #include "atomicops.h"
     32 #include "flags.h"
     33 #include "platform.h"
     34 #include "v8utils.h"
     35 
     36 #include "spaces.h"
     37 
     38 #include "heap.h"
     39 
     40 namespace v8 {
     41 namespace internal {
     42 
     43 class SweeperThread : public Thread {
     44  public:
     45   explicit SweeperThread(Isolate* isolate);
     46   ~SweeperThread() {}
     47 
     48   void Run();
     49   void Stop();
     50   void StartSweeping();
     51   void WaitForSweeperThread();
     52   intptr_t StealMemory(PagedSpace* space);
     53 
     54   static int NumberOfThreads(int max_available);
     55 
     56  private:
     57   Isolate* isolate_;
     58   Heap* heap_;
     59   MarkCompactCollector* collector_;
     60   Semaphore start_sweeping_semaphore_;
     61   Semaphore end_sweeping_semaphore_;
     62   Semaphore stop_semaphore_;
     63   FreeList free_list_old_data_space_;
     64   FreeList free_list_old_pointer_space_;
     65   FreeList private_free_list_old_data_space_;
     66   FreeList private_free_list_old_pointer_space_;
     67   volatile AtomicWord stop_thread_;
     68 };
     69 
     70 } }  // namespace v8::internal
     71 
     72 #endif  // V8_SWEEPER_THREAD_H_
     73