155 lines
3.9 KiB
C++
155 lines
3.9 KiB
C++
// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of NVIDIA CORPORATION nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Copyright (c) 2008-2025 NVIDIA Corporation. All rights reserved.
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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
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// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
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#include "foundation/windows/PxWindowsInclude.h"
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#include "foundation/PxUserAllocated.h"
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#include "foundation/PxMutex.h"
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#include "foundation/PxErrorCallback.h"
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#include "foundation/PxThread.h"
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namespace physx
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{
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namespace
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{
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struct MutexWinImpl
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{
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CRITICAL_SECTION mLock;
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PxThread::Id mOwner;
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};
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}
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static PX_FORCE_INLINE MutexWinImpl* getMutex(PxMutexImpl* impl)
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{
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return reinterpret_cast<MutexWinImpl*>(impl);
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}
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PxMutexImpl::PxMutexImpl()
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{
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InitializeCriticalSection(&getMutex(this)->mLock);
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getMutex(this)->mOwner = 0;
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}
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PxMutexImpl::~PxMutexImpl()
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{
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DeleteCriticalSection(&getMutex(this)->mLock);
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}
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void PxMutexImpl::lock()
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{
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EnterCriticalSection(&getMutex(this)->mLock);
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#if PX_DEBUG
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getMutex(this)->mOwner = PxThread::getId();
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#endif
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}
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bool PxMutexImpl::trylock()
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{
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bool success = TryEnterCriticalSection(&getMutex(this)->mLock) != 0;
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#if PX_DEBUG
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if(success)
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getMutex(this)->mOwner = PxThread::getId();
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#endif
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return success;
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}
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void PxMutexImpl::unlock()
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{
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#if PX_DEBUG
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// ensure we are already holding the lock
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if(getMutex(this)->mOwner != PxThread::getId())
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{
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PxGetFoundation().error(PxErrorCode::eINVALID_OPERATION, PX_FL, "Mutex must be unlocked only by thread that has already acquired lock");
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return;
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}
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#endif
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LeaveCriticalSection(&getMutex(this)->mLock);
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}
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uint32_t PxMutexImpl::getSize()
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{
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return sizeof(MutexWinImpl);
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}
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class ReadWriteLockImpl
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{
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PX_NOCOPY(ReadWriteLockImpl)
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public:
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ReadWriteLockImpl()
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{
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}
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PxMutex mutex;
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volatile LONG readerCount; // handle recursive writer locking
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};
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PxReadWriteLock::PxReadWriteLock()
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{
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mImpl = reinterpret_cast<ReadWriteLockImpl*>(PX_ALLOC(sizeof(ReadWriteLockImpl), "ReadWriteLockImpl"));
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PX_PLACEMENT_NEW(mImpl, ReadWriteLockImpl);
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mImpl->readerCount = 0;
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}
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PxReadWriteLock::~PxReadWriteLock()
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{
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mImpl->~ReadWriteLockImpl();
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PX_FREE(mImpl);
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}
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void PxReadWriteLock::lockReader(bool takeLock)
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{
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if(takeLock)
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mImpl->mutex.lock();
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InterlockedIncrement(&mImpl->readerCount);
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if(takeLock)
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mImpl->mutex.unlock();
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}
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void PxReadWriteLock::lockWriter()
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{
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mImpl->mutex.lock();
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// spin lock until no readers
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while(mImpl->readerCount);
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}
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void PxReadWriteLock::unlockReader()
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{
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InterlockedDecrement(&mImpl->readerCount);
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}
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void PxReadWriteLock::unlockWriter()
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{
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mImpl->mutex.unlock();
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}
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} // namespace physx
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