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119 lines
3.3 KiB
C++
119 lines
3.3 KiB
C++
//
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// Semaphore_POSIX.cpp
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//
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// $Id: //poco/svn/Foundation/src/Semaphore_POSIX.cpp#2 $
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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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// 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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#include "Poco/Semaphore_POSIX.h"
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#include <sys/time.h>
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namespace Poco {
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SemaphoreImpl::SemaphoreImpl(int n, int max): _n(n), _max(max)
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{
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poco_assert (n >= 0 && max > 0 && n <= max);
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if (pthread_mutex_init(&_mutex, NULL))
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throw SystemException("cannot create semaphore (mutex)");
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if (pthread_cond_init(&_cond, NULL))
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throw SystemException("cannot create semaphore (condition)");
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}
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SemaphoreImpl::~SemaphoreImpl()
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{
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pthread_cond_destroy(&_cond);
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pthread_mutex_destroy(&_mutex);
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}
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void SemaphoreImpl::waitImpl()
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{
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if (pthread_mutex_lock(&_mutex))
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throw SystemException("wait for semaphore failed (lock)");
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while (_n < 1)
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{
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if (pthread_cond_wait(&_cond, &_mutex))
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{
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pthread_mutex_unlock(&_mutex);
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throw SystemException("wait for semaphore failed");
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}
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}
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--_n;
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pthread_mutex_unlock(&_mutex);
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}
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bool SemaphoreImpl::waitImpl(long milliseconds)
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{
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int rc = 0;
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struct timespec abstime;
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#if defined(__VMS)
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struct timespec delta;
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delta.tv_sec = milliseconds / 1000;
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delta.tv_nsec = (milliseconds % 1000)*1000000;
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pthread_get_expiration_np(&delta, &abstime);
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#else
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struct timeval tv;
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gettimeofday(&tv, NULL);
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abstime.tv_sec = tv.tv_sec + milliseconds / 1000;
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abstime.tv_nsec = tv.tv_usec*1000 + (milliseconds % 1000)*1000000;
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if (abstime.tv_nsec >= 1000000000)
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{
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abstime.tv_nsec -= 1000000000;
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abstime.tv_sec++;
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}
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#endif
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if (pthread_mutex_lock(&_mutex) != 0)
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throw SystemException("wait for semaphore failed (lock)");
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while (_n < 1)
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{
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if ((rc = pthread_cond_timedwait(&_cond, &_mutex, &abstime)))
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{
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if (rc == ETIMEDOUT) break;
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pthread_mutex_unlock(&_mutex);
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throw SystemException("cannot wait for semaphore");
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}
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}
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if (rc == 0) --_n;
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pthread_mutex_unlock(&_mutex);
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return rc == 0;
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}
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} // namespace Poco
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