PxMutex.h

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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
 
#ifndef PX_MUTEX_H
#define PX_MUTEX_H
 
#include "foundation/PxAllocator.h"
 
/*
 * This <new> inclusion is a best known fix for gcc 4.4.1 error:
 * Creating object file for apex/src/PsAllocator.cpp ...
 * In file included from apex/include/PsFoundation.h:30,
 *                from apex/src/PsAllocator.cpp:26:
 * apex/include/PsMutex.h: In constructor  'physx::PxMutexT<Alloc>::MutexT(const Alloc&)':
 * apex/include/PsMutex.h:92: error: no matching function for call to 'operator new(unsigned int,
 * physx::PxMutexImpl*&)'
 * <built-in>:0: note: candidates are: void* operator new(unsigned int)
 */
#include <new>
 
#if !PX_DOXYGEN
namespace physx
{
#endif
class PX_FOUNDATION_API PxMutexImpl
{
  public:
    PxMutexImpl();
 
    ~PxMutexImpl();
 
    void lock();
 
    bool trylock();
 
    void unlock();
 
    static uint32_t getSize();
};
 
template <typename Alloc = PxReflectionAllocator<PxMutexImpl> >
class PxMutexT : protected Alloc
{
    PX_NOCOPY(PxMutexT)
  public:
    class ScopedLock
    {
        PxMutexT<Alloc>& mMutex;
        PX_NOCOPY(ScopedLock)
      public:
        PX_INLINE ScopedLock(PxMutexT<Alloc>& mutex) : mMutex(mutex)
        {
            mMutex.lock();
        }
        PX_INLINE ~ScopedLock()
        {
            mMutex.unlock();
        }
    };
 
    PxMutexT(const Alloc& alloc = Alloc()) : Alloc(alloc)
    {
        mImpl = reinterpret_cast<PxMutexImpl*>(Alloc::allocate(PxMutexImpl::getSize(), __FILE__, __LINE__));
        PX_PLACEMENT_NEW(mImpl, PxMutexImpl)();
    }
 
    ~PxMutexT()
    {
        mImpl->~PxMutexImpl();
        Alloc::deallocate(mImpl);
    }
 
    PX_FORCE_INLINE void lock() const
    {
        mImpl->lock();
    }
 
    PX_FORCE_INLINE bool trylock() const
    {
        return mImpl->trylock();
    }
 
    PX_FORCE_INLINE void unlock() const
    {
        mImpl->unlock();
    }
 
  private:
    PxMutexImpl* mImpl;
};
 
class PX_FOUNDATION_API PxReadWriteLock
{
    PX_NOCOPY(PxReadWriteLock)
  public:
    PxReadWriteLock();
    ~PxReadWriteLock();
 
    // "takeLock" can only be false if the thread already holds the mutex, e.g. if it already acquired the write lock
    void lockReader(bool takeLock);
    void lockWriter();
 
    void unlockReader();
    void unlockWriter();
 
  private:
    class ReadWriteLockImpl* mImpl;
};
 
typedef PxMutexT<> PxMutex;
 
#if !PX_DOXYGEN
} // namespace physx
#endif
 
#endif