heap/MachineStackMarker.h

   1 /*
   2  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
   4  *  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Lesser General Public
   8  *  License as published by the Free Software Foundation; either
   9  *  version 2 of the License, or (at your option) any later version.
  10  *
  11  *  This library is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Lesser General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Lesser General Public
  17  *  License along with this library; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifndef MachineThreads_h
  23 #define MachineThreads_h
  24
  25 #include <wtf/Noncopyable.h>
  26 #include <wtf/ThreadingPrimitives.h>
  27
  28 #if ENABLE(JSC_MULTIPLE_THREADS)
  29 #include <pthread.h>
  30 #endif
  31
  32 namespace JSC {
  33
  34     class Heap;
  35     class ConservativeRoots;
  36
  37     class MachineThreads {
  38         WTF_MAKE_NONCOPYABLE(MachineThreads);
  39     public:
  40         MachineThreads(Heap*);
  41         ~MachineThreads();
  42
  43         void gatherConservativeRoots(ConservativeRoots&, void* stackCurrent);
  44
  45 #if ENABLE(JSC_MULTIPLE_THREADS)
  46         void makeUsableFromMultipleThreads();
  47         void addCurrentThread(); // Only needs to be called by clients that can use the same heap from multiple threads.
  48 #endif
  49
  50     private:
  51         void gatherFromCurrentThread(ConservativeRoots&, void* stackCurrent);
  52
  53 #if ENABLE(JSC_MULTIPLE_THREADS)
  54         class Thread;
  55
  56         static void removeThread(void*);
  57         void removeCurrentThread();
  58
  59         void gatherFromOtherThread(ConservativeRoots&, Thread*);
  60 #endif
  61
  62         Heap* m_heap;
  63
  64 #if ENABLE(JSC_MULTIPLE_THREADS)
  65         Mutex m_registeredThreadsMutex;
  66         Thread* m_registeredThreads;
  67         pthread_key_t m_threadSpecific;
  68 #endif
  69     };
  70
  71 } // namespace JSC
  72
  73 #endif // MachineThreads_h