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98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
//
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// Semaphore_POSIX.h
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//
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// $Id: //poco/1.2/Foundation/include/Poco/Semaphore_POSIX.h#1 $
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//
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// Library: Foundation
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// Package: Threading
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// Module: Semaphore
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//
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// Definition of the SemaphoreImpl class for POSIX Threads.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef Foundation_Semaphore_POSIX_INCLUDED
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#define Foundation_Semaphore_POSIX_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/Exception.h"
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#include <pthread.h>
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#include <errno.h>
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namespace Poco {
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class Foundation_API SemaphoreImpl
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{
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protected:
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SemaphoreImpl(int n, int max);
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~SemaphoreImpl();
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void setImpl();
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void waitImpl();
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bool waitImpl(long milliseconds);
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private:
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volatile int _n;
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int _max;
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pthread_mutex_t _mutex;
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pthread_cond_t _cond;
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};
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//
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// inlines
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//
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inline void SemaphoreImpl::setImpl()
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{
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if (pthread_mutex_lock(&_mutex))
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throw SystemException("cannot signal semaphore (lock)");
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if (_n < _max)
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{
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++_n;
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}
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else
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{
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pthread_mutex_unlock(&_mutex);
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throw SystemException("cannot signal semaphore: count would exceed maximum");
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}
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if (pthread_cond_signal(&_cond))
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{
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pthread_mutex_unlock(&_mutex);
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throw SystemException("cannot signal semaphore");
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}
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pthread_mutex_unlock(&_mutex);
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}
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} // namespace Poco
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#endif // Foundation_Semaphore_POSIX_INCLUDED
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