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119 lines
2.6 KiB
C++
119 lines
2.6 KiB
C++
//
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// Event_POSIX.cpp
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//
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// $Id: //poco/1.4/Foundation/src/Event_POSIX.cpp#3 $
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//
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// Library: Foundation
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// Package: Threading
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// Module: Event
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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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// SPDX-License-Identifier: BSL-1.0
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//
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#include "Poco/Event_POSIX.h"
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#if defined(POCO_VXWORKS)
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#include <timers.h>
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#include <cstring>
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#else
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#include <sys/time.h>
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#endif
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namespace Poco {
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EventImpl::EventImpl(EventTypeImpl type): _auto(type == EVENT_AUTORESET_IMPL), _state(false)
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{
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#if defined(POCO_VXWORKS)
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// This workaround is for VxWorks 5.x where
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// pthread_mutex_init() won't properly initialize the mutex
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// resulting in a subsequent freeze in pthread_mutex_destroy()
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// if the mutex has never been used.
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std::memset(&_mutex, 0, sizeof(_mutex));
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#endif
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if (pthread_mutex_init(&_mutex, NULL))
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throw SystemException("cannot create event (mutex)");
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if (pthread_cond_init(&_cond, NULL))
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throw SystemException("cannot create event (condition)");
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}
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EventImpl::~EventImpl()
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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 EventImpl::waitImpl()
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{
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if (pthread_mutex_lock(&_mutex))
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throw SystemException("wait for event failed (lock)");
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while (!_state)
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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 event failed");
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}
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}
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if (_auto)
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_state = false;
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pthread_mutex_unlock(&_mutex);
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}
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bool EventImpl::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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#elif defined(POCO_VXWORKS)
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clock_gettime(CLOCK_REALTIME, &abstime);
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abstime.tv_sec += milliseconds / 1000;
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abstime.tv_nsec += (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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#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 event failed (lock)");
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while (!_state)
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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 event");
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}
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}
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if (rc == 0 && _auto) _state = false;
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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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