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127 lines
3.6 KiB
127 lines
3.6 KiB
/////////////////////////////////////////////////////////////////////////// |
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// |
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// Copyright (c) 2005-2012, Industrial Light & Magic, a division of Lucas |
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// Digital Ltd. LLC |
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// |
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// All rights reserved. |
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// |
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// Redistribution and use in source and binary forms, with or without |
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// modification, are permitted provided that the following conditions are |
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// 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 |
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// copyright notice, this list of conditions and the following disclaimer |
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// in the documentation and/or other materials provided with the |
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// distribution. |
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// * Neither the name of Industrial Light & Magic nor the names of |
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// its 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 AND CONTRIBUTORS |
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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// THEORY 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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/////////////////////////////////////////////////////////////////////////// |
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#ifndef INCLUDED_ILM_THREAD_SEMAPHORE_H |
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#define INCLUDED_ILM_THREAD_SEMAPHORE_H |
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//----------------------------------------------------------------------------- |
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// |
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// class Semaphore -- a wrapper class for |
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// system-dependent counting semaphores |
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// |
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//----------------------------------------------------------------------------- |
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#include "IlmBaseConfig.h" |
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#include "IlmThreadExport.h" |
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#include "IlmThreadNamespace.h" |
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#if defined _WIN32 || defined _WIN64 |
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# ifdef NOMINMAX |
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# undef NOMINMAX |
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# endif |
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# define NOMINMAX |
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# include <windows.h> |
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#elif HAVE_POSIX_SEMAPHORES |
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# include <semaphore.h> |
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#else |
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# ifdef ILMBASE_FORCE_CXX03 |
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# if HAVE_PTHREAD |
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# include <pthread.h> |
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# endif |
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# else |
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# include <mutex> |
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# include <condition_variable> |
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# endif |
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#endif |
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ILMTHREAD_INTERNAL_NAMESPACE_HEADER_ENTER |
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class ILMTHREAD_EXPORT Semaphore |
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{ |
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public: |
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Semaphore (unsigned int value = 0); |
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virtual ~Semaphore(); |
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void wait(); |
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bool tryWait(); |
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void post(); |
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int value() const; |
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private: |
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#if defined _WIN32 || defined _WIN64 |
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mutable HANDLE _semaphore; |
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#elif HAVE_POSIX_SEMAPHORES |
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mutable sem_t _semaphore; |
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#else |
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// |
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// If the platform has Posix threads but no semapohores, |
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// then we implement them ourselves using condition variables |
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// |
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struct sema_t |
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{ |
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unsigned int count; |
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unsigned long numWaiting; |
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# if ILMBASE_FORCE_CXX03 |
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# if HAVE_PTHREAD |
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pthread_mutex_t mutex; |
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pthread_cond_t nonZero; |
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# else |
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# error unhandled legacy setup |
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# endif |
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# else |
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std::mutex mutex; |
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std::condition_variable nonZero; |
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# endif |
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}; |
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mutable sema_t _semaphore; |
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#endif |
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void operator = (const Semaphore& s); // not implemented |
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Semaphore (const Semaphore& s); // not implemented |
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}; |
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ILMTHREAD_INTERNAL_NAMESPACE_HEADER_EXIT |
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#endif // INCLUDED_ILM_THREAD_SEMAPHORE_H
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