GRK/dependencies/physx-4.1/source/foundation/include/PsSync.h
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2022-01-12 16:07:16 +01:00

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//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of NVIDIA CORPORATION nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Copyright (c) 2008-2019 NVIDIA Corporation. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
#ifndef PSFOUNDATION_PSSYNC_H
#define PSFOUNDATION_PSSYNC_H
#include "PsAllocator.h"
namespace physx
{
namespace shdfnd
{
/*!
Implementation notes:
* - Calling set() on an already signaled Sync does not change its state.
* - Calling reset() on an already reset Sync does not change its state.
* - Calling set() on a reset Sync wakes all waiting threads (potential for thread contention).
* - Calling wait() on an already signaled Sync will return true immediately.
* - NOTE: be careful when pulsing an event with set() followed by reset(), because a
* thread that is not waiting on the event will miss the signal.
*/
class PX_FOUNDATION_API SyncImpl
{
public:
static const uint32_t waitForever = 0xffffffff;
SyncImpl();
~SyncImpl();
/** Wait on the object for at most the given number of ms. Returns
* true if the object is signaled. Sync::waitForever will block forever
* or until the object is signaled.
*/
bool wait(uint32_t milliseconds = waitForever);
/** Signal the synchronization object, waking all threads waiting on it */
void set();
/** Reset the synchronization object */
void reset();
/**
Size of this class.
*/
static uint32_t getSize();
};
/*!
Implementation notes:
* - Calling set() on an already signaled Sync does not change its state.
* - Calling reset() on an already reset Sync does not change its state.
* - Calling set() on a reset Sync wakes all waiting threads (potential for thread contention).
* - Calling wait() on an already signaled Sync will return true immediately.
* - NOTE: be careful when pulsing an event with set() followed by reset(), because a
* thread that is not waiting on the event will miss the signal.
*/
template <typename Alloc = ReflectionAllocator<SyncImpl> >
class SyncT : protected Alloc
{
public:
static const uint32_t waitForever = SyncImpl::waitForever;
SyncT(const Alloc& alloc = Alloc()) : Alloc(alloc)
{
mImpl = reinterpret_cast<SyncImpl*>(Alloc::allocate(SyncImpl::getSize(), __FILE__, __LINE__));
PX_PLACEMENT_NEW(mImpl, SyncImpl)();
}
~SyncT()
{
mImpl->~SyncImpl();
Alloc::deallocate(mImpl);
}
/** Wait on the object for at most the given number of ms. Returns
* true if the object is signaled. Sync::waitForever will block forever
* or until the object is signaled.
*/
bool wait(uint32_t milliseconds = SyncImpl::waitForever)
{
return mImpl->wait(milliseconds);
}
/** Signal the synchronization object, waking all threads waiting on it */
void set()
{
mImpl->set();
}
/** Reset the synchronization object */
void reset()
{
mImpl->reset();
}
private:
class SyncImpl* mImpl;
};
typedef SyncT<> Sync;
} // namespace shdfnd
} // namespace physx
#endif // #ifndef PSFOUNDATION_PSSYNC_H