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85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
// -*- mode: c++; c-basic-offset: 4 -*-
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/*
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* This file is part of the KDE libraries
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* Copyright (C) 2005 Apple Computer, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef JSLOCK_H
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#define JSLOCK_H
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#include "global.h"
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namespace KJS {
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// to make it safe to use JavaScript on multiple threads, it is
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// important to lock before doing anything that allocates a
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// garbage-collected object or which may affect other shared state
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// such as the protect count hash table. The simplest way to do
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// this is by having a local JSLock object for the scope
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// where the lock must be held. The lock is recursive so nesting
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// is ok.
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// Sometimes it is necessary to temporarily release the lock -
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// since it is recursive you have to actually release all locks
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// held by your thread. This is safe to do if you are executing
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// code that doesn't require the lock, and reacquire the right
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// number of locks at the end. You can do this by constructing a
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// locally scoped JSLock::DropAllLocks object.
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class KJS_EXPORT JSLock
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{
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public:
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JSLock()
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{
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lock();
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}
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~JSLock() {
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unlock();
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}
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static void lock();
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static void unlock();
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static int lockCount();
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class DropAllLocks {
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public:
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DropAllLocks();
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~DropAllLocks();
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private:
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int m_lockCount;
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DropAllLocks(const DropAllLocks&);
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DropAllLocks& operator=(const DropAllLocks&);
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};
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private:
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JSLock(const JSLock&);
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JSLock& operator=(const JSLock&);
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};
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#if !USE(MULTIPLE_THREADS)
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inline void JSLock::lock() {}
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inline void JSLock::unlock() {}
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// Fix the lock count at 1 so assertions that the lock is held don't fail
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inline int JSLock::lockCount() { return 1; }
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#endif
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} // namespace
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#endif // JSLOCK_H
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