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Event_POSIX.cpp
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138 lines (122 loc) · 3.86 KB
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//
// Event_POSIX.cpp
//
// $Id: //poco/1.4/Foundation/src/Event_POSIX.cpp#3 $
//
// Library: Foundation
// Package: Threading
// Module: Event
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#include "Poco/Event_POSIX.h"
#if defined(POCO_VXWORKS)
#include <timers.h>
#include <cstring>
#else
#include <sys/time.h>
#endif
namespace Poco {
EventImpl::EventImpl(bool autoReset): _auto(autoReset), _state(false)
{
#if defined(POCO_VXWORKS)
// This workaround is for VxWorks 5.x where
// pthread_mutex_init() won't properly initialize the mutex
// resulting in a subsequent freeze in pthread_mutex_destroy()
// if the mutex has never been used.
std::memset(&_mutex, 0, sizeof(_mutex));
#endif
if (pthread_mutex_init(&_mutex, NULL))
throw SystemException("cannot create event (mutex)");
if (pthread_cond_init(&_cond, NULL))
throw SystemException("cannot create event (condition)");
}
EventImpl::~EventImpl()
{
pthread_cond_destroy(&_cond);
pthread_mutex_destroy(&_mutex);
}
void EventImpl::waitImpl()
{
if (pthread_mutex_lock(&_mutex))
throw SystemException("wait for event failed (lock)");
while (!_state)
{
if (pthread_cond_wait(&_cond, &_mutex))
{
pthread_mutex_unlock(&_mutex);
throw SystemException("wait for event failed");
}
}
if (_auto)
_state = false;
pthread_mutex_unlock(&_mutex);
}
bool EventImpl::waitImpl(long milliseconds)
{
int rc = 0;
struct timespec abstime;
#if defined(__VMS)
struct timespec delta;
delta.tv_sec = milliseconds / 1000;
delta.tv_nsec = (milliseconds % 1000)*1000000;
pthread_get_expiration_np(&delta, &abstime);
#elif defined(POCO_VXWORKS)
clock_gettime(CLOCK_REALTIME, &abstime);
abstime.tv_sec += milliseconds / 1000;
abstime.tv_nsec += (milliseconds % 1000)*1000000;
if (abstime.tv_nsec >= 1000000000)
{
abstime.tv_nsec -= 1000000000;
abstime.tv_sec++;
}
#else
struct timeval tv;
gettimeofday(&tv, NULL);
abstime.tv_sec = tv.tv_sec + milliseconds / 1000;
abstime.tv_nsec = tv.tv_usec*1000 + (milliseconds % 1000)*1000000;
if (abstime.tv_nsec >= 1000000000)
{
abstime.tv_nsec -= 1000000000;
abstime.tv_sec++;
}
#endif
if (pthread_mutex_lock(&_mutex) != 0)
throw SystemException("wait for event failed (lock)");
while (!_state)
{
if ((rc = pthread_cond_timedwait(&_cond, &_mutex, &abstime)))
{
if (rc == ETIMEDOUT) break;
pthread_mutex_unlock(&_mutex);
throw SystemException("cannot wait for event");
}
}
if (rc == 0 && _auto) _state = false;
pthread_mutex_unlock(&_mutex);
return rc == 0;
}
} // namespace Poco