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Event_POSIX.cpp
//
// 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

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