56 lines
2.7 KiB
C++
56 lines
2.7 KiB
C++
// ======================================================================== //
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// Copyright 2009-2012 Intel Corporation //
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// //
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// Licensed under the Apache License, Version 2.0 (the "License"); //
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// you may not use this file except in compliance with the License. //
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// You may obtain a copy of the License at //
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// //
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// http://www.apache.org/licenses/LICENSE-2.0 //
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// //
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// Unless required by applicable law or agreed to in writing, software //
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// distributed under the License is distributed on an "AS IS" BASIS, //
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. //
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// See the License for the specific language governing permissions and //
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// limitations under the License. //
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// ======================================================================== //
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#include "mutex.h"
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#if defined(__WIN32__) && !defined(PTHREADS_WIN32)
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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namespace embree
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{
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/*! system mutex using windows API */
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MutexSys::MutexSys( void ) { mutex = new CRITICAL_SECTION; InitializeCriticalSection((CRITICAL_SECTION*)mutex); }
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MutexSys::~MutexSys( void ) { DeleteCriticalSection((CRITICAL_SECTION*)mutex); delete (CRITICAL_SECTION*)mutex; }
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void MutexSys::lock( void ) { EnterCriticalSection((CRITICAL_SECTION*)mutex); }
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void MutexSys::unlock( void ) { LeaveCriticalSection((CRITICAL_SECTION*)mutex); }
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void MutexActive::lock ( void ) {
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while ( cmpxchg($lock, LOCK_IS_TAKEN, LOCK_IS_FREE) != LOCK_IS_FREE) _mm_pause();
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__memory_barrier(); // compiler must not schedule loads and stores around this point
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}
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}
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#endif
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#if defined(__UNIX__) || defined(PTHREADS_WIN32)
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#include <pthread.h>
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#include <xmmintrin.h>
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namespace embree
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{
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/*! system mutex using pthreads */
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MutexSys::MutexSys( void ) { mutex = new pthread_mutex_t; pthread_mutex_init((pthread_mutex_t*)mutex, NULL); }
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MutexSys::~MutexSys( void ) { pthread_mutex_destroy((pthread_mutex_t*)mutex); delete (pthread_mutex_t*)mutex; }
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void MutexSys::lock( void ) { pthread_mutex_lock((pthread_mutex_t*)mutex); }
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void MutexSys::unlock( void ) { pthread_mutex_unlock((pthread_mutex_t*)mutex); }
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void MutexActive::lock ( void ) {
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while ( cmpxchg($lock, LOCK_IS_TAKEN, LOCK_IS_FREE) != LOCK_IS_FREE) _mm_pause();
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__memory_barrier(); // compiler must not schedule loads and stores around this point
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}
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}
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#endif
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