File indexing completed on 2024-05-12 15:43:24

 /*
  * This file is part of the KDE libraries
  * Copyright (C) 2005 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef JSLOCK_H
 #define JSLOCK_H
 
 #include "global.h"
 
 namespace KJS
 {
 
 // to make it safe to use JavaScript on multiple threads, it is
 // important to lock before doing anything that allocates a
 // garbage-collected object or which may affect other shared state
 // such as the protect count hash table. The simplest way to do
 // this is by having a local JSLock object for the scope
 // where the lock must be held. The lock is recursive so nesting
 // is ok.
 
 // Sometimes it is necessary to temporarily release the lock -
 // since it is recursive you have to actually release all locks
 // held by your thread. This is safe to do if you are executing
 // code that doesn't require the lock, and reacquire the right
 // number of locks at the end. You can do this by constructing a
 // locally scoped JSLock::DropAllLocks object.
 
 class KJS_EXPORT JSLock
 {
 public:
     JSLock()
     {
         lock();
     }
     ~JSLock()
     {
         unlock();
     }
 
     static void lock();
     static void unlock();
     static int lockCount();
 
     class DropAllLocks
     {
     public:
         DropAllLocks();
         ~DropAllLocks();
     private:
         int m_lockCount;
 
         DropAllLocks(const DropAllLocks &);
         DropAllLocks &operator=(const DropAllLocks &);
     };
 
 private:
     JSLock(const JSLock &);
     JSLock &operator=(const JSLock &);
 };
 
 #if !USE(MULTIPLE_THREADS)
 inline void JSLock::lock()      {}
 inline void JSLock::unlock()    {}
 // Fix the lock count at 1 so assertions that the lock is held don't fail
 inline int JSLock::lockCount()
 {
     return 1;
 }
 #endif
 
 } // namespace
 
 #endif // JSLOCK_H