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/ThreadSpecific.h>
  27 #include <wtf/ThreadingPrimitives.h>
  28
  29 namespace JSC {
  30
  31     class ConservativeRoots;
  32     class Heap;
  33
  34     class MachineThreads {
  35         WTF_MAKE_NONCOPYABLE(MachineThreads);
  36     public:
  37         MachineThreads(Heap*);
  38         ~MachineThreads();
  39
  40         void gatherConservativeRoots(ConservativeRoots&, void* stackCurrent);
  41
  42 #if PLATFORM(IOS)
  43         JS_EXPORT_PRIVATE void makeUsableFromMultipleThreads();
  44 #else
  45         void makeUsableFromMultipleThreads();
  46 #endif
  47         JS_EXPORT_PRIVATE void addCurrentThread(); // Only needs to be called by clients that can use the same heap from multiple threads.
  48
  49     private:
  50         void gatherFromCurrentThread(ConservativeRoots&, void* stackCurrent);
  51
  52         class Thread;
  53
  54         static void removeThread(void*);
  55         void removeCurrentThread();
  56
  57         void gatherFromOtherThread(ConservativeRoots&, Thread*);
  58
  59         Mutex m_registeredThreadsMutex;
  60         Thread* m_registeredThreads;
  61         WTF::ThreadSpecificKey m_threadSpecific;
  62 #if !ASSERT_DISABLED
  63         Heap* m_heap;
  64 #endif
  65     };
  66
  67 } // namespace JSC
  68
  69 #endif // MachineThreads_h