Proactor.cpp

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// $Id: Proactor.cpp 81535 2008-04-29 20:08:52Z shuston $

#include "ace/config-lite.h"
#include "ace/Proactor.h"
#if defined (ACE_HAS_WIN32_OVERLAPPED_IO) || defined (ACE_HAS_AIO_CALLS)

// This only works on Win32 platforms and on Unix platforms with aio
// calls.

#include "ace/Auto_Ptr.h"
#include "ace/Proactor_Impl.h"
#include "ace/Object_Manager.h"
#include "ace/Task_T.h"

#if !defined (ACE_HAS_WINCE) && !defined (ACE_LACKS_ACE_SVCCONF)
#    include "ace/Service_Config.h"
#endif /* !ACE_HAS_WINCE && !ACE_LACKS_ACE_SVCCONF */


ACE_RCSID (ace,
           Proactor,
           "$Id: Proactor.cpp 81535 2008-04-29 20:08:52Z shuston $")


#include "ace/Task_T.h"
#include "ace/Log_Msg.h"
#include "ace/Framework_Component.h"

#if defined (ACE_HAS_AIO_CALLS)
#   include "ace/POSIX_Proactor.h"
#   include "ace/POSIX_CB_Proactor.h"
#else /* !ACE_HAS_AIO_CALLS */
#   include "ace/WIN32_Proactor.h"
#endif /* ACE_HAS_AIO_CALLS */

#if !defined (__ACE_INLINE__)
#include "ace/Proactor.inl"
#endif /* __ACE_INLINE__ */

#include "ace/Auto_Event.h"

ACE_BEGIN_VERSIONED_NAMESPACE_DECL

/// Process-wide ACE_Proactor.
ACE_Proactor *ACE_Proactor::proactor_ = 0;

/// Controls whether the Proactor is deleted when we shut down (we can
/// only delete it safely if we created it!)
bool ACE_Proactor::delete_proactor_ = false;

/**
 * @class ACE_Proactor_Timer_Handler
 *
 * @brief A Handler for timer. It helps in the management of timers
 * registered with the Proactor.
 *
 * This object has a thread that will wait on the earliest time
 * in a list of timers and an event. When a timer expires, the
 * thread will post a completion event on the port and go back
 * to waiting on the timer queue and event. If the event is
 * signaled, the thread will refresh the time it is currently
 * waiting on (in case the earliest time has changed).
 */
class ACE_Proactor_Timer_Handler : public ACE_Task<ACE_NULL_SYNCH>
{

  /// Proactor has special privileges
  /// Access needed to: timer_event_
  friend class ACE_Proactor;

public:
  /// Constructor.
  ACE_Proactor_Timer_Handler (ACE_Proactor &proactor);

  /// Destructor.
  virtual ~ACE_Proactor_Timer_Handler (void);

  /// Proactor calls this to shut down the timer handler
  /// gracefully. Just calling the destructor alone doesnt do what
  /// <destroy> does. <destroy> make sure the thread exits properly.
  int destroy (void);

protected:
  /// Run by a daemon thread to handle deferred processing. In other
  /// words, this method will do the waiting on the earliest timer and
  /// event.
  virtual int svc (void);

  /// Event to wait on.
  ACE_Auto_Event timer_event_;

  /// Proactor.
  ACE_Proactor &proactor_;

  /// Flag used to indicate when we are shutting down.
  int shutting_down_;
};

ACE_Proactor_Timer_Handler::ACE_Proactor_Timer_Handler (ACE_Proactor &proactor)
  : ACE_Task <ACE_NULL_SYNCH> (&proactor.thr_mgr_),
    proactor_ (proactor),
    shutting_down_ (0)
{
}

ACE_Proactor_Timer_Handler::~ACE_Proactor_Timer_Handler (void)
{
  // Mark for closing down.
  this->shutting_down_ = 1;

  // Signal timer event.
  this->timer_event_.signal ();

  // Wait for the Timer Handler thread to exit.
  this->wait ();
}

int
ACE_Proactor_Timer_Handler::svc (void)
{
  ACE_Time_Value absolute_time;
  ACE_Time_Value relative_time;
  int result = 0;

  while (this->shutting_down_ == 0)
    {
      // Check whether the timer queue has any items in it.
      if (this->proactor_.timer_queue ()->is_empty () == 0)
        {
          // Get the earliest absolute time.
          absolute_time = this->proactor_.timer_queue ()->earliest_time ();

          // Get current time from timer queue since we don't know
          // which <gettimeofday> was used.
          ACE_Time_Value cur_time = this->proactor_.timer_queue ()->gettimeofday ();

          // Compare absolute time with curent time received from the
          // timer queue.
          if (absolute_time > cur_time)
            relative_time = absolute_time - cur_time;
          else
            relative_time = ACE_Time_Value::zero;

          // Block for relative time.
          result = this->timer_event_.wait (&relative_time, 0);
        }
      else
        // The timer queue has no entries, so wait indefinitely.
        result = this->timer_event_.wait ();

      // Check for timer expiries.
      if (result == -1)
        {
          switch (errno)
            {
            case ETIME:
              // timeout: expire timers
              this->proactor_.timer_queue ()->expire ();
              break;
            default:
              // Error.
              ACE_ERROR_RETURN ((LM_ERROR,
                                 ACE_TEXT ("%N:%l:(%P | %t):%p\n"),
                                 ACE_TEXT ("ACE_Proactor_Timer_Handler::svc:wait failed")),
                                -1);
            }
        }
    }
  return 0;
}

// *********************************************************************

ACE_Proactor_Handle_Timeout_Upcall::ACE_Proactor_Handle_Timeout_Upcall (void)
  : proactor_ (0)
{
}

int
ACE_Proactor_Handle_Timeout_Upcall::registration (TIMER_QUEUE &,
                                                  ACE_Handler *,
                                                  const void *)
{
  return 0;
}

int
ACE_Proactor_Handle_Timeout_Upcall::preinvoke (TIMER_QUEUE &,
                                               ACE_Handler *,
                                               const void *,
                                               int,
                                               const ACE_Time_Value &,
                                               const void *&)
{
  return 0;
}

int
ACE_Proactor_Handle_Timeout_Upcall::postinvoke (TIMER_QUEUE &,
                                                ACE_Handler *,
                                                const void *,
                                                int,
                                                const ACE_Time_Value &,
                                                const void *)
{
  return 0;
}

int
ACE_Proactor_Handle_Timeout_Upcall::timeout (TIMER_QUEUE &,
                                             ACE_Handler *handler,
                                             const void *act,
                                             int,
                                             const ACE_Time_Value &time)
{
  if (this->proactor_ == 0)
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("(%t) No Proactor set in ACE_Proactor_Handle_Timeout_Upcall,")
                       ACE_TEXT (" no completion port to post timeout to?!@\n")),
                      -1);

  // Create the Asynch_Timer.
  ACE_Asynch_Result_Impl *asynch_timer =
    this->proactor_->create_asynch_timer (handler->proxy (),
                                          act,
                                          time,
                                          ACE_INVALID_HANDLE,
                                          0,
                                          -1);

  if (asynch_timer == 0)
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("%N:%l:(%P | %t):%p\n"),
                       ACE_TEXT ("ACE_Proactor_Handle_Timeout_Upcall::timeout:")
                       ACE_TEXT ("create_asynch_timer failed")),
                      -1);

  auto_ptr<ACE_Asynch_Result_Impl> safe_asynch_timer (asynch_timer);

  // Post a completion.
  if (-1 == safe_asynch_timer->post_completion
      (this->proactor_->implementation ()))
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("Failure in dealing with timers: ")
                       ACE_TEXT ("PostQueuedCompletionStatus failed\n")),
                      -1);

  // The completion has been posted.  The proactor is now responsible
  // for managing the asynch_timer memory.
  (void) safe_asynch_timer.release ();

  return 0;
}

int
ACE_Proactor_Handle_Timeout_Upcall::cancel_type (TIMER_QUEUE &,
                                                 ACE_Handler *,
                                                 int,
                                                 int &)
{
  // Do nothing
  return 0;
}

int
ACE_Proactor_Handle_Timeout_Upcall::cancel_timer (TIMER_QUEUE &,
                                                  ACE_Handler *,
                                                  int,
                                                  int)
{
  // Do nothing
  return 0;
}

int
ACE_Proactor_Handle_Timeout_Upcall::deletion (TIMER_QUEUE &,
                                              ACE_Handler *,
                                              const void *)
{
  // Do nothing
  return 0;
}

int
ACE_Proactor_Handle_Timeout_Upcall::proactor (ACE_Proactor &proactor)
{
  if (this->proactor_ == 0)
    {
      this->proactor_ = &proactor;
      return 0;
    }
  else
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("ACE_Proactor_Handle_Timeout_Upcall is only suppose")
                       ACE_TEXT (" to be used with ONE (and only one) Proactor\n")),
                      -1);
}

// *********************************************************************

ACE_Proactor::ACE_Proactor (ACE_Proactor_Impl *implementation,
                            bool delete_implementation,
                            TIMER_QUEUE *tq)
  : implementation_ (0),
    delete_implementation_ (delete_implementation),
    timer_handler_ (0),
    timer_queue_ (0),
    delete_timer_queue_ (0),
    end_event_loop_ (0),
    event_loop_thread_count_ (0)
{
  this->implementation (implementation);

  if (this->implementation () == 0)
    {
#if defined (ACE_HAS_AIO_CALLS)
      // POSIX Proactor.
#  if defined (ACE_POSIX_AIOCB_PROACTOR)
      ACE_NEW (implementation, ACE_POSIX_AIOCB_Proactor);
#  elif defined (ACE_POSIX_SIG_PROACTOR)
      ACE_NEW (implementation, ACE_POSIX_SIG_Proactor);
#  else /* Default order: CB, SIG, AIOCB */
#    if !defined(ACE_HAS_BROKEN_SIGEVENT_STRUCT)
      ACE_NEW (implementation, ACE_POSIX_CB_Proactor);
#    else
#      if defined(ACE_HAS_POSIX_REALTIME_SIGNALS)
      ACE_NEW (implementation, ACE_POSIX_SIG_Proactor);
#      else
      ACE_NEW (implementation, ACE_POSIX_AIOCB_Proactor);
#      endif /* ACE_HAS_POSIX_REALTIME_SIGNALS */
#    endif /* !ACE_HAS_BROKEN_SIGEVENT_STRUCT */
#  endif /* ACE_POSIX_AIOCB_PROACTOR */
#elif (defined (ACE_WIN32) && !defined (ACE_HAS_WINCE))
      // WIN_Proactor.
      ACE_NEW (implementation,
               ACE_WIN32_Proactor);
#endif /* ACE_HAS_AIO_CALLS */
      this->implementation (implementation);
      this->delete_implementation_ = true;
    }

  // Set the timer queue.
  this->timer_queue (tq);

  // Create the timer handler
  ACE_NEW (this->timer_handler_,
           ACE_Proactor_Timer_Handler (*this));

  // Activate <timer_handler>.
  if (this->timer_handler_->activate () == -1)
    ACE_ERROR ((LM_ERROR,
                ACE_TEXT ("%N:%l:(%P | %t):%p\n"),
                ACE_TEXT ("Task::activate:could not create thread\n")));
}

ACE_Proactor::~ACE_Proactor (void)
{
  this->close ();
}

ACE_Proactor *
ACE_Proactor::instance (size_t /* threads */)
{
  ACE_TRACE ("ACE_Proactor::instance");

  if (ACE_Proactor::proactor_ == 0)
    {
      // Perform Double-Checked Locking Optimization.
      ACE_MT (ACE_GUARD_RETURN (ACE_Recursive_Thread_Mutex, ace_mon,
                                *ACE_Static_Object_Lock::instance (),
                                0));

      if (ACE_Proactor::proactor_ == 0)
        {
          ACE_NEW_RETURN (ACE_Proactor::proactor_,
                          ACE_Proactor,
                          0);

          ACE_Proactor::delete_proactor_ = true;
          ACE_REGISTER_FRAMEWORK_COMPONENT(ACE_Proactor, ACE_Proactor::proactor_);
        }
    }
  return ACE_Proactor::proactor_;
}

ACE_Proactor *
ACE_Proactor::instance (ACE_Proactor * r, bool delete_proactor)
{
  ACE_TRACE ("ACE_Proactor::instance");

  ACE_MT (ACE_GUARD_RETURN (ACE_Recursive_Thread_Mutex, ace_mon,
                            *ACE_Static_Object_Lock::instance (), 0));

  ACE_Proactor *t = ACE_Proactor::proactor_;

  ACE_Proactor::delete_proactor_ = delete_proactor;
  ACE_Proactor::proactor_ = r;
  ACE_REGISTER_FRAMEWORK_COMPONENT(ACE_Proactor, ACE_Proactor::proactor_);

  return t;
}

void
ACE_Proactor::close_singleton (void)
{
  ACE_TRACE ("ACE_Proactor::close_singleton");

  ACE_MT (ACE_GUARD (ACE_Recursive_Thread_Mutex, ace_mon,
                     *ACE_Static_Object_Lock::instance ()));

  if (ACE_Proactor::delete_proactor_)
    {
      delete ACE_Proactor::proactor_;
      ACE_Proactor::proactor_ = 0;
      ACE_Proactor::delete_proactor_ = false;
    }
}

const ACE_TCHAR *
ACE_Proactor::dll_name (void)
{
  return ACE_TEXT ("ACE");
}

const ACE_TCHAR *
ACE_Proactor::name (void)
{
  return ACE_TEXT ("ACE_Proactor");
}

int
ACE_Proactor::check_reconfiguration (ACE_Proactor *)
{
#if !defined (ACE_HAS_WINCE)  &&  !defined (ACE_LACKS_ACE_SVCCONF)
  if (ACE_Service_Config::reconfig_occurred ())
    {
      ACE_Service_Config::reconfigure ();
      return 1;
    }
#endif /* ! ACE_HAS_WINCE || ! ACE_LACKS_ACE_SVCCONF */
  return 0;
}

int
ACE_Proactor::proactor_run_event_loop (PROACTOR_EVENT_HOOK eh)
{
  ACE_TRACE ("ACE_Proactor::proactor_run_event_loop");
  int result = 0;

  {
    ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, mutex_, -1));

    // Early check. It is ok to do this without lock, since we care just
    // whether it is zero or non-zero.
    if (this->end_event_loop_ != 0)
      return 0;

    // First time you are in. Increment the thread count.
    this->event_loop_thread_count_ ++;
  }

  // Run the event loop.
  for (;;)
    {
      // Check the end loop flag. It is ok to do this without lock,
      // since we care just whether it is zero or non-zero.
      if (this->end_event_loop_ != 0)
        break;

      // <end_event_loop> is not set. Ready to do <handle_events>.
      result = this->handle_events ();

      if (eh != 0 && (*eh) (this))
        continue;

      if (result == -1)
        break;
    }

  // Leaving the event loop. Decrement the thread count.

  {
    // Obtain the lock in the MT environments.
    ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, mutex_, -1));

    // Decrement the thread count.
    this->event_loop_thread_count_ --;

    if (this->event_loop_thread_count_ > 0
       && this->end_event_loop_ != 0)
       this->proactor_post_wakeup_completions (1);
  }

  return result;
}

// Handle events for -tv- time.  handle_events updates -tv- to reflect
// time elapsed, so do not return until -tv- == 0, or an error occurs.
int
ACE_Proactor::proactor_run_event_loop (ACE_Time_Value &tv,
                                       PROACTOR_EVENT_HOOK eh)
{
  ACE_TRACE ("ACE_Proactor::proactor_run_event_loop");
  int result = 0;

  {
    ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, mutex_, -1));

    // Early check. It is ok to do this without lock, since we care just
    // whether it is zero or non-zero.
    if (this->end_event_loop_ != 0
       || tv == ACE_Time_Value::zero)
      return 0;

    // First time you are in. Increment the thread count.
    this->event_loop_thread_count_ ++;
  }

  // Run the event loop.
  for (;;)
    {
      // Check the end loop flag. It is ok to do this without lock,
      // since we care just whether it is zero or non-zero.
      if (this->end_event_loop_ != 0)
        break;

      // <end_event_loop> is not set. Ready to do <handle_events>.
      result = this->handle_events (tv);

      if (eh != 0 && (*eh) (this))
        continue;

      if (result == -1 || result == 0)
        break;
    }

  // Leaving the event loop. Decrement the thread count.

  {
    ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, mutex_, -1));

    // Decrement the thread count.
    this->event_loop_thread_count_ --;

    if (this->event_loop_thread_count_ > 0
       && this->end_event_loop_ != 0)
       this->proactor_post_wakeup_completions (1);
  }

  return result;
}

int
ACE_Proactor::proactor_reset_event_loop(void)
{
  ACE_TRACE ("ACE_Proactor::proactor_reset_event_loop");

  // Obtain the lock in the MT environments.
  ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, mutex_, -1));

  this->end_event_loop_ = 0;
  return 0;
}

int
ACE_Proactor::proactor_end_event_loop (void)
{
  ACE_TRACE ("ACE_Proactor::proactor_end_event_loop");

  int how_many = 0;

  {
    // Obtain the lock, set the end flag and post the wakeup
    // completions.
    ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, mutex_, -1));

    // Set the end flag.
    this->end_event_loop_ = 1;

    // Number of completions to post.
    how_many = this->event_loop_thread_count_;
    if (how_many == 0)
      return 0;
  }

  // Post completions to all the threads so that they will all wake
  // up.
  return this->proactor_post_wakeup_completions (how_many);
}

int
ACE_Proactor::proactor_event_loop_done (void)
{
  ACE_TRACE ("ACE_Proactor::proactor_event_loop_done");

  ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, mutex_, -1));

  return this->end_event_loop_ != 0 ? 1 : 0 ;
}

int
ACE_Proactor::close (void)
{
  // Close the implementation.
  if (this->implementation ()->close () == -1)
    ACE_ERROR ((LM_ERROR,
                ACE_TEXT ("%N:%l:(%P | %t):%p\n"),
                ACE_TEXT ("ACE_Proactor::close: implementation close")));

  // Delete the implementation.
  if (this->delete_implementation_)
    {
      delete this->implementation ();
      this->implementation_ = 0;
    }

  // Delete the timer handler.
  if (this->timer_handler_)
    {
      delete this->timer_handler_;
      this->timer_handler_ = 0;
    }

  // Delete the timer queue.
  if (this->delete_timer_queue_)
    {
      delete this->timer_queue_;
      this->timer_queue_ = 0;
      this->delete_timer_queue_ = 0;
    }

  return 0;
}

int
ACE_Proactor::register_handle (ACE_HANDLE handle,
                               const void *completion_key)
{
  return this->implementation ()->register_handle (handle,
                                                   completion_key);
}

long
ACE_Proactor::schedule_timer (ACE_Handler &handler,
                              const void *act,
                              const ACE_Time_Value &time)
{
  return this->schedule_timer (handler,
                               act,
                               time,
                               ACE_Time_Value::zero);
}

long
ACE_Proactor::schedule_repeating_timer (ACE_Handler &handler,
                                        const void *act,
                                        const ACE_Time_Value &interval)
{
  return this->schedule_timer (handler,
                               act,
                               interval,
                               interval);
}

long
ACE_Proactor::schedule_timer (ACE_Handler &handler,
                              const void *act,
                              const ACE_Time_Value &time,
                              const ACE_Time_Value &interval)
{
  // absolute time.
  ACE_Time_Value absolute_time =
    this->timer_queue_->gettimeofday () + time;

  // Only one guy goes in here at a time
  ACE_MT (ACE_GUARD_RETURN (ACE_SYNCH_RECURSIVE_MUTEX,
                            ace_mon,
                            this->timer_queue_->mutex (),
                            -1));

  // Remember the old proactor.
  ACE_Proactor *old_proactor = handler.proactor ();

  // Assign *this* Proactor to the handler.
  handler.proactor (this);

  // Schedule the timer
  long result = this->timer_queue_->schedule (&handler,
                                              act,
                                              absolute_time,
                                              interval);
  if (result != -1)
    {
      // no failures: check to see if we are the earliest time
      if (this->timer_queue_->earliest_time () == absolute_time)

        // wake up the timer thread
        if (this->timer_handler_->timer_event_.signal () == -1)
          {
            // Cancel timer
            this->timer_queue_->cancel (result);
            result = -1;
          }
    }

  if (result == -1)
    {
      // Reset the old proactor in case of failures.
      handler.proactor (old_proactor);
    }

  return result;
}

int
ACE_Proactor::cancel_timer (long timer_id,
                            const void **arg,
                            int dont_call_handle_close)
{
  // No need to singal timer event here. Even if the cancel timer was
  // the earliest, we will have an extra wakeup.
  return this->timer_queue_->cancel (timer_id,
                                     arg,
                                     dont_call_handle_close);
}

int
ACE_Proactor::cancel_timer (ACE_Handler &handler,
                                  int dont_call_handle_close)
{
  // No need to signal timer event here. Even if the cancel timer was
  // the earliest, we will have an extra wakeup.
  return this->timer_queue_->cancel (&handler,
                                     dont_call_handle_close);
}

int
ACE_Proactor::handle_events (ACE_Time_Value &wait_time)
{
  return implementation ()->handle_events (wait_time);
}

int
ACE_Proactor::handle_events (void)
{
  return this->implementation ()->handle_events ();
}

int
ACE_Proactor::wake_up_dispatch_threads (void)
{
  return 0;
}

int
ACE_Proactor::close_dispatch_threads (int)
{
  return 0;
}

size_t
ACE_Proactor::number_of_threads (void) const
{
  return this->implementation ()->number_of_threads ();
}

void
ACE_Proactor::number_of_threads (size_t threads)
{
  this->implementation ()->number_of_threads (threads);
}

ACE_Proactor::TIMER_QUEUE *
ACE_Proactor::timer_queue (void) const
{
  return this->timer_queue_;
}

void
ACE_Proactor::timer_queue (TIMER_QUEUE *tq)
{
  // Cleanup old timer queue.
  if (this->delete_timer_queue_)
    {
      delete this->timer_queue_;
      this->delete_timer_queue_ = 0;
    }

  // New timer queue.
  if (tq == 0)
    {
      ACE_NEW (this->timer_queue_,
               TIMER_HEAP);
      this->delete_timer_queue_ = 1;
    }
  else
    {
      this->timer_queue_ = tq;
      this->delete_timer_queue_ = 0;
    }

  // Set the proactor in the timer queue's functor
  this->timer_queue_->upcall_functor ().proactor (*this);
}

ACE_HANDLE
ACE_Proactor::get_handle (void) const
{
  return this->implementation ()->get_handle ();
}

ACE_Proactor_Impl *
ACE_Proactor::implementation (void) const
{
  return this->implementation_;
}


ACE_Asynch_Read_Stream_Impl *
ACE_Proactor::create_asynch_read_stream (void)
{
  return this->implementation ()->create_asynch_read_stream ();
}

ACE_Asynch_Write_Stream_Impl *
ACE_Proactor::create_asynch_write_stream (void)
{
  return this->implementation ()->create_asynch_write_stream ();
}

ACE_Asynch_Read_Dgram_Impl *
ACE_Proactor::create_asynch_read_dgram (void)
{
  return this->implementation ()->create_asynch_read_dgram ();
}

ACE_Asynch_Write_Dgram_Impl *
ACE_Proactor::create_asynch_write_dgram (void)
{
  return this->implementation ()->create_asynch_write_dgram ();
}

ACE_Asynch_Read_File_Impl *
ACE_Proactor::create_asynch_read_file (void)
{
  return this->implementation ()->create_asynch_read_file ();
}

ACE_Asynch_Write_File_Impl *
ACE_Proactor::create_asynch_write_file (void)
{
  return this->implementation ()->create_asynch_write_file ();
}

ACE_Asynch_Accept_Impl *
ACE_Proactor::create_asynch_accept (void)
{
  return this->implementation ()->create_asynch_accept ();
}

ACE_Asynch_Connect_Impl *
ACE_Proactor::create_asynch_connect (void)
{
  return this->implementation ()->create_asynch_connect ();
}

ACE_Asynch_Transmit_File_Impl *
ACE_Proactor::create_asynch_transmit_file (void)
{
  return this->implementation ()->create_asynch_transmit_file ();
}

ACE_Asynch_Read_Stream_Result_Impl *
ACE_Proactor::create_asynch_read_stream_result
  (ACE_Handler::Proxy_Ptr &handler_proxy,
   ACE_HANDLE handle,
   ACE_Message_Block &message_block,
   u_long bytes_to_read,
   const void* act,
   ACE_HANDLE event,
   int priority,
   int signal_number)
{
  return this->implementation ()->create_asynch_read_stream_result
    (handler_proxy,
     handle,
     message_block,
     bytes_to_read,
     act,
     event,
     priority,
     signal_number);
}


ACE_Asynch_Write_Stream_Result_Impl *
ACE_Proactor::create_asynch_write_stream_result
  (ACE_Handler::Proxy_Ptr &handler_proxy,
   ACE_HANDLE handle,
   ACE_Message_Block &message_block,
   u_long bytes_to_write,
   const void* act,
   ACE_HANDLE event,
   int priority,
   int signal_number)
{
  return this->implementation ()->create_asynch_write_stream_result
    (handler_proxy,
     handle,
     message_block,
     bytes_to_write,
     act,
     event,
     priority,
     signal_number);
}

ACE_Asynch_Read_File_Result_Impl *
ACE_Proactor::create_asynch_read_file_result
  (ACE_Handler::Proxy_Ptr &handler_proxy,
   ACE_HANDLE handle,
   ACE_Message_Block &message_block,
   u_long bytes_to_read,
   const void* act,
   u_long offset,
   u_long offset_high,
   ACE_HANDLE event,
   int priority,
   int signal_number)
{
  return this->implementation ()->create_asynch_read_file_result
    (handler_proxy,
     handle,
     message_block,
     bytes_to_read,
     act,
     offset,
     offset_high,
     event,
     priority,
     signal_number);
}

ACE_Asynch_Write_File_Result_Impl *
ACE_Proactor::create_asynch_write_file_result
  (ACE_Handler::Proxy_Ptr &handler_proxy,
   ACE_HANDLE handle,
   ACE_Message_Block &message_block,
   u_long bytes_to_write,
   const void* act,
   u_long offset,
   u_long offset_high,
   ACE_HANDLE event,
   int priority,
   int signal_number)
{
  return this->implementation ()->create_asynch_write_file_result
    (handler_proxy,
     handle,
     message_block,
     bytes_to_write,
     act,
     offset,
     offset_high,
     event,
     priority,
     signal_number);
}

ACE_Asynch_Read_Dgram_Result_Impl *
ACE_Proactor::create_asynch_read_dgram_result
  (ACE_Handler::Proxy_Ptr &handler_proxy,
   ACE_HANDLE handle,
   ACE_Message_Block *message_block,
   size_t bytes_to_read,
   int flags,
   int protocol_family,
   const void* act,
   ACE_HANDLE event,
   int priority,
   int signal_number)
{
  return this->implementation()->create_asynch_read_dgram_result
    (handler_proxy,
     handle,
     message_block,
     bytes_to_read,
     flags,
     protocol_family,
     act,
     event,
     priority,
     signal_number);
}

ACE_Asynch_Write_Dgram_Result_Impl *
ACE_Proactor::create_asynch_write_dgram_result
  (ACE_Handler::Proxy_Ptr &handler_proxy,
   ACE_HANDLE handle,
   ACE_Message_Block *message_block,
   size_t bytes_to_write,
   int flags,
   const void* act,
   ACE_HANDLE event,
   int priority,
   int signal_number)
{
  return this->implementation()->create_asynch_write_dgram_result
    (handler_proxy,
     handle,
     message_block,
     bytes_to_write,
     flags,
     act,
     event,
     priority,
     signal_number);
}

ACE_Asynch_Accept_Result_Impl *
ACE_Proactor::create_asynch_accept_result
  (ACE_Handler::Proxy_Ptr &handler_proxy,
   ACE_HANDLE listen_handle,
   ACE_HANDLE accept_handle,
   ACE_Message_Block &message_block,
   u_long bytes_to_read,
   const void* act,
   ACE_HANDLE event,
   int priority,
   int signal_number)
{
  return this->implementation ()->create_asynch_accept_result
    (handler_proxy,
     listen_handle,
     accept_handle,
     message_block,
     bytes_to_read,
     act,
     event,
     priority,
     signal_number);
}

ACE_Asynch_Connect_Result_Impl *
ACE_Proactor::create_asynch_connect_result
  (ACE_Handler::Proxy_Ptr &handler_proxy,
   ACE_HANDLE  connect_handle,
   const void* act,
   ACE_HANDLE event,
   int priority,
   int signal_number)
{
  return this->implementation ()->create_asynch_connect_result
    (handler_proxy,
     connect_handle,
     act,
     event,
     priority,
     signal_number);
}

ACE_Asynch_Transmit_File_Result_Impl *
ACE_Proactor::create_asynch_transmit_file_result
  (ACE_Handler::Proxy_Ptr &handler_proxy,
   ACE_HANDLE socket,
   ACE_HANDLE file,
   ACE_Asynch_Transmit_File::Header_And_Trailer *header_and_trailer,
   u_long bytes_to_write,
   u_long offset,
   u_long offset_high,
   u_long bytes_per_send,
   u_long flags,
   const void *act,
   ACE_HANDLE event,
   int priority,
   int signal_number)
{
  return this->implementation ()->create_asynch_transmit_file_result
    (handler_proxy,
     socket,
     file,
     header_and_trailer,
     bytes_to_write,
     offset,
     offset_high,
     bytes_per_send,
     flags,
     act,
     event,
     priority,
     signal_number);
}

ACE_Asynch_Result_Impl *
ACE_Proactor::create_asynch_timer
  (ACE_Handler::Proxy_Ptr &handler_proxy,
   const void *act,
   const ACE_Time_Value &tv,
   ACE_HANDLE event,
   int priority,
   int signal_number)
{
  return this->implementation ()->create_asynch_timer
    (handler_proxy,
     act,
     tv,
     event,
     priority,
     signal_number);
}

int
ACE_Proactor::proactor_post_wakeup_completions (int how_many)
{
  return this->implementation ()->post_wakeup_completions (how_many);
}

void
ACE_Proactor::implementation (ACE_Proactor_Impl *implementation)
{
  this->implementation_ = implementation;
}

ACE_END_VERSIONED_NAMESPACE_DECL

#else /* !ACE_WIN32 || !ACE_HAS_AIO_CALLS */

ACE_BEGIN_VERSIONED_NAMESPACE_DECL

ACE_Proactor *
ACE_Proactor::instance (size_t /* threads */)
{
  return 0;
}

ACE_Proactor *
ACE_Proactor::instance (ACE_Proactor *)
{
  return 0;
}

void
ACE_Proactor::close_singleton (void)
{
}

int
ACE_Proactor::run_event_loop (void)
{
  // not implemented
  return -1;
}

int
ACE_Proactor::run_event_loop (ACE_Time_Value &)
{
  // not implemented
  return -1;
}

int
ACE_Proactor::end_event_loop (void)
{
  // not implemented
  return -1;
}

sig_atomic_t
ACE_Proactor::event_loop_done (void)
{
  return sig_atomic_t (1);
}

ACE_END_VERSIONED_NAMESPACE_DECL

#endif /* ACE_HAS_WIN32_OVERLAPPED_IO || ACE_HAS_AIO_CALLS */

---