76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
/*
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Copyright (c) 2003-2014 Erwin Coumans http://bullet.googlecode.com
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This software is provided 'as-is', without any express or implied warranty.
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In no event will the authors be held liable for any damages arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it freely,
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subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef BT_THREADS_H
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#define BT_THREADS_H
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#include "btScalar.h" // has definitions like SIMD_FORCE_INLINE
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///
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/// btSpinMutex -- lightweight spin-mutex implemented with atomic ops, never puts
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/// a thread to sleep because it is designed to be used with a task scheduler
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/// which has one thread per core and the threads don't sleep until they
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/// run out of tasks. Not good for general purpose use.
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///
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class btSpinMutex
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{
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int mLock;
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public:
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btSpinMutex()
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{
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mLock = 0;
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}
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void lock();
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void unlock();
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bool tryLock();
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};
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#if BT_THREADSAFE
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// for internal Bullet use only
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SIMD_FORCE_INLINE void btMutexLock( btSpinMutex* mutex )
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{
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mutex->lock();
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}
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SIMD_FORCE_INLINE void btMutexUnlock( btSpinMutex* mutex )
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{
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mutex->unlock();
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}
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SIMD_FORCE_INLINE bool btMutexTryLock( btSpinMutex* mutex )
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{
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return mutex->tryLock();
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}
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// for internal use only
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bool btIsMainThread();
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unsigned int btGetCurrentThreadIndex();
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const unsigned int BT_MAX_THREAD_COUNT = 64;
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#else
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// for internal Bullet use only
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// if BT_THREADSAFE is undefined or 0, should optimize away to nothing
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SIMD_FORCE_INLINE void btMutexLock( btSpinMutex* ) {}
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SIMD_FORCE_INLINE void btMutexUnlock( btSpinMutex* ) {}
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SIMD_FORCE_INLINE bool btMutexTryLock( btSpinMutex* ) {return true;}
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#endif
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#endif //BT_THREADS_H
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