109 lines
2.5 KiB
C++
109 lines
2.5 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
|
|
*
|
|
* This library is open source and may be redistributed and/or modified under
|
|
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
|
|
* (at your option) any later version. The full license is in LICENSE file
|
|
* included with this distribution, and on the openscenegraph.org website.
|
|
*
|
|
* 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
|
|
* OpenSceneGraph Public License for more details.
|
|
*/
|
|
|
|
#ifndef OSGDB_REENTRANTMUTEX
|
|
#define OSGDB_REENTRANTMUTEX
|
|
|
|
#include <OpenThreads/Thread>
|
|
#include <OpenThreads/Mutex>
|
|
|
|
#include <osgDB/Export>
|
|
|
|
namespace osgDB {
|
|
|
|
class OSGDB_EXPORT ReentrantMutex : public OpenThreads::Mutex
|
|
{
|
|
public:
|
|
|
|
ReentrantMutex();
|
|
|
|
virtual ~ReentrantMutex();
|
|
|
|
virtual int lock();
|
|
|
|
virtual int unlock();
|
|
|
|
virtual int trylock();
|
|
|
|
private:
|
|
|
|
ReentrantMutex(const ReentrantMutex&):OpenThreads::Mutex() {}
|
|
|
|
ReentrantMutex& operator =(const ReentrantMutex&) { return *(this); }
|
|
|
|
OpenThreads::Thread* _threadHoldingMutex;
|
|
|
|
OpenThreads::Mutex _lockCountMutex;
|
|
unsigned int _lockCount;
|
|
|
|
};
|
|
|
|
class OSGDB_EXPORT ReadWriteMutex
|
|
{
|
|
public:
|
|
|
|
ReadWriteMutex();
|
|
|
|
virtual ~ReadWriteMutex();
|
|
|
|
virtual int readLock();
|
|
|
|
virtual int readUnlock();
|
|
|
|
virtual int writeLock();
|
|
|
|
virtual int writeUnlock();
|
|
|
|
protected:
|
|
|
|
ReadWriteMutex(const ReadWriteMutex&) {}
|
|
ReadWriteMutex& operator = (const ReadWriteMutex&) { return *(this); }
|
|
|
|
#if 0
|
|
ReentrantMutex _readWriteMutex;
|
|
ReentrantMutex _readCountMutex;
|
|
#else
|
|
OpenThreads::Mutex _readWriteMutex;
|
|
OpenThreads::Mutex _readCountMutex;
|
|
#endif
|
|
unsigned int _readCount;
|
|
|
|
};
|
|
|
|
class ScopedReadLock
|
|
{
|
|
public:
|
|
|
|
ScopedReadLock(ReadWriteMutex& mutex):_mutex(mutex) { _mutex.readLock(); }
|
|
~ScopedReadLock() { _mutex.readUnlock(); }
|
|
|
|
protected:
|
|
ReadWriteMutex& _mutex;
|
|
};
|
|
|
|
|
|
class ScopedWriteLock
|
|
{
|
|
public:
|
|
|
|
ScopedWriteLock(ReadWriteMutex& mutex):_mutex(mutex) { _mutex.writeLock(); }
|
|
~ScopedWriteLock() { _mutex.writeUnlock(); }
|
|
|
|
protected:
|
|
ReadWriteMutex& _mutex;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|