*** empty log message ***

1 files changed, 1138 insertions, 0 deletions

diff --git a/ace/POSIX_Proactor.cpp b/ace/POSIX_Proactor.cpp
new file mode 100644
index 00000000000..05bac013d1c
--- /dev/null
+++ b/ace/POSIX_Proactor.cpp
@@ -0,0 +1,1138 @@
+// $Id$
+
+#define ACE_BUILD_DLL
+#include "ace/POSIX_Proactor.h"
+
+#if defined (ACE_HAS_AIO_CALLS)
+
+#include "ace/Task_T.h"
+#include "ace/Log_Msg.h"
+#include "ace/Object_Manager.h"
+
+#if !defined (__ACE_INLINE__)
+#include "ace/POSIX_Proactor.i"
+#endif /* __ACE_INLINE__ */
+
+ACE_POSIX_Proactor::~ACE_POSIX_Proactor (void)
+{
+}
+
+int
+ACE_POSIX_Proactor::close (void)
+{
+#if 0
+  // Take care of the timer handler
+  if (this->timer_handler_)
+    {
+      delete this->timer_handler_;
+      this->timer_handler_ = 0;
+    }
+
+  // Take care of the timer queue
+  if (this->delete_timer_queue_)
+    {
+      delete this->timer_queue_;
+      this->timer_queue_ = 0;
+      this->delete_timer_queue_ = 0;
+    }
+#endif /* 0 */
+  return 0;
+}
+
+int
+ACE_POSIX_Proactor::register_handle (ACE_HANDLE handle,
+                                     const void *completion_key)
+{
+  ACE_UNUSED_ARG (handle);
+  ACE_UNUSED_ARG (completion_key);
+  return 0;
+}
+
+long
+ACE_POSIX_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_POSIX_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_POSIX_Proactor::schedule_timer (ACE_Handler &handler,
+                                    const void *act,
+                                    const ACE_Time_Value &time,
+                                    const ACE_Time_Value &interval)
+{
+  ACE_UNUSED_ARG (handler);
+  ACE_UNUSED_ARG (act);
+  ACE_UNUSED_ARG (time);
+  ACE_UNUSED_ARG (interval);
+  ACE_NOTSUP_RETURN ((long) -1);
+
+#if 0
+  // absolute time.
+  ACE_Time_Value absolute_time =
+    this->timer_queue_->gettimeofday () + time;
+
+  // Only one guy goes in here at a time
+  ACE_GUARD_RETURN (ACE_Recursive_Thread_Mutex, ace_mon, this->timer_queue_->mutex (), -1);
+
+  // 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;
+          }
+    }
+  return result;
+#endif /* 0 */
+}
+
+int
+ACE_POSIX_Proactor::cancel_timer (long timer_id,
+                                  const void **arg,
+                                  int dont_call_handle_close)
+{
+  ACE_NOTSUP_RETURN (-1);
+#if 0
+  // 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);
+#endif /* 0 */
+}
+
+int
+ACE_POSIX_Proactor::cancel_timer (ACE_Handler &handler,
+                                  int dont_call_handle_close)
+{
+  ACE_NOTSUP_RETURN (-1);
+#if 0  
+  // 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);
+#endif /* 0 */
+}
+
+int
+ACE_POSIX_Proactor::post_completion (ACE_POSIX_Asynch_Result *result)
+{
+  ACE_UNUSED_ARG (result);
+  return 0;
+}
+
+#if 0
+int
+ACE_POSIX_Proactor::handle_signal (int, siginfo_t *, ucontext_t *)
+{
+  // Perform a non-blocking "poll" for all the I/O events that have
+  // completed in the I/O completion queue.
+
+  ACE_Time_Value timeout (0, 0);
+  int result = 0;
+
+  while (1)
+    {
+      result = this->handle_events (timeout);
+      if (result != 0 || errno == ETIME)
+        break;
+    }
+
+  // If our handle_events failed, we'll report a failure to the
+  // Reactor.
+  return result == -1 ? -1 : 0;
+}
+
+int
+ACE_POSIX_Proactor::handle_close (ACE_HANDLE handle,
+                                  ACE_Reactor_Mask close_mask)
+{
+  ACE_UNUSED_ARG (close_mask);
+  ACE_UNUSED_ARG (handle);
+
+  return this->close ();
+}
+#endif /* 0 */
+
+ACE_HANDLE
+ACE_POSIX_Proactor::get_handle (void) const
+{
+  // @@ Implement this.
+  return ACE_INVALID_HANDLE;
+}
+
+ACE_Asynch_Read_Stream_Result_Impl *
+ACE_POSIX_Proactor::create_asynch_read_stream_result (ACE_Handler &handler,
+                                                      ACE_HANDLE handle,
+                                                      ACE_Message_Block &message_block,
+                                                      u_long bytes_to_read,
+                                                      const void* act,
+                                                      ACE_HANDLE event,
+                                                      int priority)
+{
+  ACE_Asynch_Read_Stream_Result_Impl *implementation;
+  ACE_NEW_RETURN (implementation,
+                  ACE_POSIX_Asynch_Read_Stream_Result (handler,
+                                                       handle,
+                                                       message_block,
+                                                       bytes_to_read,
+                                                       act,
+                                                       event,
+                                                       priority),
+                  0);
+  return implementation;
+}
+
+ACE_Asynch_Write_Stream_Result_Impl *
+ACE_POSIX_Proactor::create_asynch_write_stream_result (ACE_Handler &handler,
+                                                       ACE_HANDLE handle,
+                                                       ACE_Message_Block &message_block,
+                                                       u_long bytes_to_write,
+                                                       const void* act,
+                                                       ACE_HANDLE event,
+                                                       int priority)
+{
+  ACE_Asynch_Write_Stream_Result_Impl *implementation;
+  ACE_NEW_RETURN (implementation,
+                  ACE_POSIX_Asynch_Write_Stream_Result (handler,
+                                                        handle,
+                                                        message_block,
+                                                        bytes_to_write,
+                                                        act,
+                                                        event,
+                                                        priority),
+                  0);
+  return implementation;
+}
+
+ACE_Asynch_Read_File_Result_Impl *
+ACE_POSIX_Proactor::create_asynch_read_file_result (ACE_Handler &handler,
+                                                    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)
+{
+  ACE_Asynch_Read_File_Result_Impl *implementation;
+  ACE_NEW_RETURN (implementation,
+                  ACE_POSIX_Asynch_Read_File_Result (handler,
+                                                     handle,
+                                                     message_block,
+                                                     bytes_to_read,
+                                                     act,
+                                                     offset,
+                                                     offset_high,
+                                                     event,
+                                                     priority),
+                  0);
+  return implementation;
+}
+
+ACE_Asynch_Write_File_Result_Impl *
+ACE_POSIX_Proactor::create_asynch_write_file_result (ACE_Handler &handler,
+                                                     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)
+{
+  ACE_Asynch_Write_File_Result_Impl *implementation;
+  ACE_NEW_RETURN (implementation,
+                  ACE_POSIX_Asynch_Write_File_Result (handler,
+                                                      handle,
+                                                      message_block,
+                                                      bytes_to_write,
+                                                      act,
+                                                      offset,
+                                                      offset_high,
+                                                      event,
+                                                      priority),
+                  0);
+  return implementation;
+}
+
+ACE_Asynch_Accept_Result_Impl *
+ACE_POSIX_Proactor::create_asynch_accept_result (ACE_Handler &handler,
+                                           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)
+{
+  ACE_Asynch_Accept_Result_Impl *implementation;
+  ACE_NEW_RETURN (implementation,
+                  ACE_POSIX_Asynch_Accept_Result (handler,
+                                                  listen_handle,
+                                                  accept_handle,
+                                                  message_block,
+                                                  bytes_to_read,
+                                                  act,
+                                                  event,
+                                                  priority),
+                  0);
+  return implementation;
+}
+
+ACE_Asynch_Transmit_File_Result_Impl *
+ACE_POSIX_Proactor::create_asynch_transmit_file_result (ACE_Handler &handler,
+                                                        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)
+{
+  ACE_Asynch_Transmit_File_Result_Impl *implementation;
+  ACE_NEW_RETURN (implementation,
+                  ACE_POSIX_Asynch_Transmit_File_Result (handler,
+                                                         socket,
+                                                         file,
+                                                         header_and_trailer,
+                                                         bytes_to_write,
+                                                         offset,
+                                                         offset_high,
+                                                         bytes_per_send,
+                                                         flags,
+                                                         act,
+                                                         event,
+                                                         priority),
+                  0);
+  return implementation;
+}
+
+ACE_POSIX_Proactor::ACE_POSIX_Proactor (void)
+{
+}
+
+void
+ACE_POSIX_Proactor::application_specific_code (ACE_POSIX_Asynch_Result *asynch_result,
+                                               u_long bytes_transferred,
+                                               int success,
+                                               const void *completion_key,
+                                               u_long error)
+{
+  ACE_SEH_TRY
+    {
+      // Call completion hook
+      asynch_result->complete (bytes_transferred,
+                               success,
+                               (void *) completion_key,
+                               error);
+    }
+  ACE_SEH_FINALLY
+    {
+      // This is crucial to prevent memory leaks
+      delete asynch_result;
+    }
+}
+
+
+
+int
+ACE_POSIX_Proactor::wake_up_dispatch_threads (void)
+{
+  return 0;
+}
+
+int
+ACE_POSIX_Proactor::close_dispatch_threads (int)
+{
+  return 0;
+}
+
+size_t
+ACE_POSIX_Proactor::number_of_threads (void) const
+{
+  // @@ Implement it. 
+  return 0;
+}
+
+void
+ACE_POSIX_Proactor::number_of_threads (size_t threads)
+{
+  // @@ Implement it.
+  ACE_UNUSED_ARG (threads);
+}
+
+#if 0
+ACE_Proactor::Timer_Queue *
+ACE_POSIX_Proactor::timer_queue (void) const
+{
+  return this->timer_queue_;
+}
+
+void
+ACE_POSIX_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)
+    {
+      this->timer_queue_ = new 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);
+}
+#endif /* 0 */
+
+// *********************************************************************
+
+class ACE_Export ACE_AIO_Accept_Handler : public ACE_Handler
+{
+  // = TITLE
+  //     Helper class for doing Asynch_Accept in POSIX4 systems, in
+  //     the case of doing AIO_CONTROL_BLOCKS strategy.
+  //
+  // = DESCRIPTION
+  //     Doing Asynch_Accept in POSIX4 implementation is tricky. In
+  //     the case of doing the things with AIO_CONTROL_BLOCKS and not
+  //     with Real-Time Signals, this becomes even more trickier. We
+  //     use a notifyn pipe here to implement Asynch_Accpet. This class
+  //     will issue a <Asynch_Read> on the pipe. <Asynch_Accept> will
+  //     send a result pointer containg all the information through
+  //     this pipe.
+  //     Handling the MessageBlock:
+  //     We give this message block to read the result pointer through
+  //     the notify pipe. We expect that to read 4 bytes from the
+  //     notify pipe, for each <accept> call. Before giving this
+  //     message block to another <accept>, we update <wr_ptr> and put
+  //     it in its initial position. 
+public:
+  ACE_AIO_Accept_Handler (ACE_POSIX_AIOCB_Proactor *posix_aiocb_proactor);
+  // Constructor. You need the posix proactor because you need to call
+  // things like application_specific_code etc. Having the main
+  // proactor is good so that life is easier when we use Asynch_Read,
+  // while issuing asynchronous read on the notify pipe.
+  
+  virtual ~ACE_AIO_Accept_Handler (void);
+  // Destructor.
+
+#if 0
+  void proactor (ACE_Proactor *proactor);
+  // Set the Proactor pointer. POSIX_AIOCB_Proactor may not have the
+  // Proactor pointer when it creates this object and so we have this
+  // method so that it can set it when it gets it.
+#endif /* 0 */
+            
+  int notify (ACE_POSIX_Asynch_Accept_Result *result);
+  // Send this Result to Proactor through the notification pipe.
+
+  virtual void handle_read_stream (const ACE_Asynch_Read_Stream::Result &result);
+  // Read from the pipe is complete.  We get the <Result> from
+  // Asynch_Handler. We have to do the notification here.
+
+private:
+#if 0
+  ACE_Proactor *proactor_;
+  // The main proactor interface.
+#endif /* 0 */
+
+  ACE_POSIX_AIOCB_Proactor  *posix_aiocb_proactor_;
+  // The implementation proactor class.
+
+  ACE_Message_Block message_block_;
+  // Message block to get ACE_Asynch_Accept::Result pointer from
+  // ACE_Asych_Accept. 
+
+  ACE_Pipe pipe_;
+  // Pipe for the communication between Proactor and the
+  // Asynch_Accept.
+
+  ACE_POSIX_AIOCB_Asynch_Read_Stream read_stream_;
+  // To do asynch_read on the pipe.
+
+  ACE_AIO_Accept_Handler (void);
+  // Default constructor. Shouldnt be called.
+};
+
+ACE_AIO_Accept_Handler::ACE_AIO_Accept_Handler (ACE_POSIX_AIOCB_Proactor *posix_aiocb_proactor)
+  : posix_aiocb_proactor_ (posix_aiocb_proactor),
+    message_block_ (sizeof (ACE_POSIX_Asynch_Accept_Result *)),
+    read_stream_ (posix_aiocb_proactor)
+{
+  // Open the pipe.
+  this->pipe_.open ();
+
+  // Open the read stream.
+  if (this->read_stream_.open (*this,
+                               this->pipe_.read_handle (),
+                               0, // Completion Key
+                               0) // Proactor
+      == -1)
+    ACE_ERROR ((LM_ERROR,
+                "%N:%l:%p\n",
+                "Open on Read Stream failed"));
+  
+  // Issue an asynch_read on the read_stream of the notify pipe. 
+  if (this->read_stream_.read (this->message_block_,
+                               sizeof (ACE_POSIX_Asynch_Accept_Result *),
+                               0, // ACT
+                               0) // Priority
+      == -1)
+    ACE_ERROR ((LM_ERROR,
+                "%N:%l:%p\n",
+                "Read from stream failed"));
+}
+
+ACE_AIO_Accept_Handler::~ACE_AIO_Accept_Handler (void)
+{
+}
+
+int
+ACE_AIO_Accept_Handler::notify (ACE_POSIX_Asynch_Accept_Result *result)
+{
+  // Send the result pointer through the pipe.
+  int return_val = ACE::send (this->pipe_.write_handle (),
+                              (char *) &result,
+                              sizeof (result));
+  if (return_val != sizeof (result))
+    ACE_ERROR_RETURN ((LM_ERROR,
+                       "(%P %t):%p\n",
+                       "Error:Writing on to pipe failed"),
+                      -1);
+  return 0;
+}
+
+void
+ACE_AIO_Accept_Handler::handle_read_stream (const ACE_Asynch_Read_Stream::Result &result)
+{
+  // @@
+  ACE_DEBUG ((LM_DEBUG, "ACE_AIO_Accept_Handler::handle_read_stream called\n"));
+  
+  // The message block actually contains the ACE_POSIX_Asynch_Accept_Result
+  // pointer.  
+  ACE_POSIX_Asynch_Accept_Result *accept_result = 0;
+  accept_result = *(ACE_POSIX_Asynch_Accept_Result **) result.message_block ().rd_ptr ();
+  
+  // Do the upcall.
+  this->posix_aiocb_proactor_->application_specific_code (accept_result,
+                                                          0,  // No Bytes transferred.
+                                                          1,  // Success.
+                                                          0,  // Completion token.
+                                                          0); // Error.
+  
+  // Set the message block properly. Put the <wr_ptr> back in the
+  // initial position. 
+  if (this->message_block_.length () > 0)
+      this->message_block_.wr_ptr (this->message_block_.rd_ptr ());
+  
+  // One accept has completed. Issue a read to handle any <accept>s in
+  // the future.
+  if (this->read_stream_.read (this->message_block_,
+                               sizeof (ACE_POSIX_Asynch_Accept_Result),
+                               0,  // ACT
+                               0)  // Priority
+      == -1)
+    ACE_ERROR ((LM_ERROR,
+                "%N:%l:%p\n",
+                "Read from stream failed"));
+}
+
+// *********************************************************************
+
+ACE_POSIX_AIOCB_Proactor::ACE_POSIX_AIOCB_Proactor (void)
+  : aio_accept_handler_ (0),
+    aiocb_list_max_size_ (ACE_RTSIG_MAX),
+    aiocb_list_cur_size_ (0)
+{
+  // Initialize the array.
+  for (size_t ai = 0; ai < this->aiocb_list_max_size_; ai++)
+    aiocb_list_[ai] = 0;
+
+  // Accept Handler for aio_accept. Remember! this issues a Asynch_Read
+  // on the notify pipe for doing the Asynch_Accept.
+  ACE_NEW (aio_accept_handler_,
+           ACE_AIO_Accept_Handler (this));
+}
+
+// Destructor.
+ACE_POSIX_AIOCB_Proactor::~ACE_POSIX_AIOCB_Proactor (void)
+{
+}
+
+int
+ACE_POSIX_AIOCB_Proactor::handle_events (ACE_Time_Value &wait_time)
+{
+  // Decrement <wait_time> with the amount of time spent in the method
+  ACE_Countdown_Time countdown (&wait_time);
+  return this->handle_events (wait_time.msec ());
+}
+
+int
+ACE_POSIX_AIOCB_Proactor::handle_events (void)
+{
+  return this->handle_events (ACE_INFINITE);
+}
+
+ACE_Asynch_Read_Stream_Impl *
+ACE_POSIX_AIOCB_Proactor::create_asynch_read_stream (void)
+{
+  ACE_Asynch_Read_Stream_Impl *implementation = 0;
+  ACE_NEW_RETURN (implementation,
+                  ACE_POSIX_AIOCB_Asynch_Read_Stream (this),
+                  0);
+  return implementation;
+}
+
+ACE_Asynch_Write_Stream_Impl *
+ACE_POSIX_AIOCB_Proactor::create_asynch_write_stream (void)
+{
+  ACE_Asynch_Write_Stream_Impl *implementation = 0;
+  ACE_NEW_RETURN (implementation,
+                  ACE_POSIX_AIOCB_Asynch_Write_Stream (this),
+                  0);
+  return implementation;
+}
+  
+ACE_Asynch_Read_File_Impl *
+ACE_POSIX_AIOCB_Proactor::create_asynch_read_file (void)
+{
+  ACE_Asynch_Read_File_Impl *implementation = 0;
+  ACE_NEW_RETURN (implementation,
+                  ACE_POSIX_AIOCB_Asynch_Read_File (this),
+                  0);
+  return  implementation;
+}
+  
+ACE_Asynch_Write_File_Impl *
+ACE_POSIX_AIOCB_Proactor::create_asynch_write_file (void)
+{
+  ACE_Asynch_Write_File_Impl *implementation = 0;
+  ACE_NEW_RETURN (implementation,
+                  ACE_POSIX_AIOCB_Asynch_Write_File (this), 
+                  0);
+  return  implementation;
+} 
+  
+ACE_Asynch_Accept_Impl *
+ACE_POSIX_AIOCB_Proactor::create_asynch_accept (void)
+{
+  ACE_Asynch_Accept_Impl *implementation = 0;
+  ACE_NEW_RETURN (implementation,
+                  ACE_POSIX_AIOCB_Asynch_Accept (this),
+                  0);
+  return implementation;
+}
+
+ACE_Asynch_Transmit_File_Impl *
+ACE_POSIX_AIOCB_Proactor::create_asynch_transmit_file (void)
+{
+  ACE_Asynch_Transmit_File_Impl *implementation = 0;
+  ACE_NEW_RETURN (implementation,
+                  ACE_POSIX_AIOCB_Asynch_Transmit_File (this),
+                  0);
+  return  implementation;
+}
+
+int
+ACE_POSIX_AIOCB_Proactor::notify_asynch_accept (ACE_POSIX_Asynch_Accept_Result* result)
+{
+  this->aio_accept_handler_->notify (result);
+  
+  return 0;
+}
+
+int
+ACE_POSIX_AIOCB_Proactor::handle_events (unsigned long milli_seconds)
+{
+  if (this->aiocb_list_cur_size_ == 0)
+    // No aio is pending.
+    return 0;
+  
+  // Wait for asynch operation to complete.
+  // @@ Assing milli seconds correctly.
+  timespec timeout;
+  timeout.tv_sec = milli_seconds;
+  timeout.tv_nsec = 0;
+  
+  if (aio_suspend (this->aiocb_list_,
+                   this->aiocb_list_max_size_,
+                   &timeout) == -1)
+    {
+      // If failure is coz of timeout, then return *0* but set errno
+      // appropriately. This is what the WinNT proactor does.
+      if (errno ==  EAGAIN)
+        ACE_ERROR_RETURN ((LM_ERROR,
+                           "Error:%p\n",
+                           "aio_suspend"),
+                          0);
+      else
+        ACE_ERROR_RETURN ((LM_ERROR,
+                           "Error:%p\n",
+                           "aio_suspend"),
+                          -1);
+    }
+
+  // Check which aio has finished.
+  size_t ai;
+  int error_status = 0;
+  int return_status = 0;
+  for (ai = 0; ai < this->aiocb_list_max_size_; ai++)
+    {
+      if (aiocb_list_ [ai] == 0)
+        continue;
+
+      // Analyze error and return values.
+      
+      // Get the error status of the aio_ operation.
+      error_status = aio_error (aiocb_list_[ai]);
+      if (error_status == -1)
+        // <aio_error> itself has failed.
+        ACE_ERROR_RETURN ((LM_ERROR,
+                           "Error:%p\n",
+                           "<aio_error> has failed"),
+                          -1);
+      
+      if (error_status == EINPROGRESS)
+        // <aio_> operation is still in progress.
+        continue;
+      
+      // Error_status is not -1 and not EINPROGRESS. So, an <aio_> 
+      // operation has finished (successfully or unsuccessfully!!!)
+
+      ACE_ERROR ((LM_ERROR,
+                  "%N:%l:error_status = %d\n",
+                  error_status));
+      
+      // Get the return_status of the <aio_> operation.
+      return_status = aio_return (aiocb_list_[ai]);
+      if (return_status == -1)
+        {
+          // <aio_return> itself has failed.
+          ACE_ERROR_RETURN ((LM_ERROR,
+                             "Error:%p\n",
+                             "<aio_return> failed"),
+                            -1);
+        }
+      else
+        {
+          ACE_DEBUG ((LM_DEBUG, "An aio has finished\n"));
+          break;
+        }
+    }
+  
+  if (ai == this->aiocb_list_max_size_)
+    // Nothing completed.
+    return 0;
+  
+  // Retrive the result pointer.
+  ACE_POSIX_Asynch_Result *asynch_result =
+    // dynamic_cast <ACE_POSIX_Asynch_Result *> (this->aiocb_list_[ai]);
+    (ACE_POSIX_Asynch_Result *) (this->aiocb_list_[ai]);
+  if (asynch_result == 0)
+    ACE_ERROR_RETURN ((LM_ERROR,
+                       "Error:%N:%l:%p\n",
+                       "Dynamic cast failed"),
+                      -1);
+                       
+  // Invalidate entry in the aiocb list.
+  this->aiocb_list_[ai] = 0;
+  this->aiocb_list_cur_size_--;
+  
+  // Call the application code.
+  // @@ Pass <errno> instead of 0. Check out on LynxOS. It is set
+  // to 77 somewhere.
+  this->application_specific_code (asynch_result, 
+                                   return_status, // Bytes transferred.
+                                   1,             // Success
+                                   0,             // No completion key.
+                                   error_status); // Error
+  
+  return 0;
+}
+
+void
+ACE_POSIX_AIOCB_Proactor::application_specific_code (ACE_POSIX_Asynch_Result *asynch_result,
+                                                     u_long bytes_transferred,
+                                                     int success,
+                                                     const void *completion_key,
+                                                     u_long error)
+{
+  ACE_POSIX_Proactor::application_specific_code (asynch_result,
+                                                 bytes_transferred,
+                                                 success,
+                                                 completion_key,
+                                                 error);
+}
+
+int
+ACE_POSIX_AIOCB_Proactor::register_aio_with_proactor (aiocb *aiocb_ptr)
+{
+  if (aiocb_ptr == 0)
+    {
+      ACE_DEBUG ((LM_DEBUG,
+                  "Status check max %d cur %d\n",
+                  this->aiocb_list_max_size_,
+                  this->aiocb_list_cur_size_));
+
+      // Just check the status of the list.
+      if (this->aiocb_list_cur_size_ >=
+          this->aiocb_list_max_size_)
+        return -1;
+      else
+        return 0;
+    }
+
+  // Non-zero ptr. Find a free slot and store.
+
+  // Make sure again.
+  if (this->aiocb_list_cur_size_ >=
+      this->aiocb_list_max_size_)
+    ACE_ERROR_RETURN ((LM_ERROR,
+                       "Error:Asynch_Operation: No space to store the <aio> info.\n"),
+                      -1);
+
+  // Slot(s) available. Find a free one.
+  size_t ai;
+  for (ai = 0;
+       ai < this->aiocb_list_max_size_;
+       ai++)
+    if (this->aiocb_list_[ai] == 0)
+      break;
+
+   // Sanity check.
+  if (ai == this->aiocb_list_max_size_)
+    ACE_ERROR_RETURN ((LM_ERROR,
+                       "Error:Asynch_Operation: No space to store the <aio> info.\n"),
+                      -1);
+
+  // Store the pointers.
+  this->aiocb_list_[ai] = aiocb_ptr;
+  this->aiocb_list_cur_size_ ++;
+
+  return 0;
+}
+  
+// *********************************************************************
+
+ACE_POSIX_SIG_Proactor::ACE_POSIX_SIG_Proactor (void)
+{
+  // Make the sigset_t consisting of the completion signals.
+  if (sigemptyset (&this->RT_completion_signals_) < 0)
+    ACE_ERROR ((LM_ERROR,
+                "Error:%p\n",
+                "Couldn't init the RT completion signal set"));
+  
+  if (sigaddset (&this->RT_completion_signals_, ACE_SIG_AIO) < 0) 
+    ACE_ERROR ((LM_ERROR,
+                "Error:%p\n",
+                "Couldnt init the RT completion signal set"));
+  
+  // Mask them.
+  if (sigprocmask (SIG_BLOCK, &RT_completion_signals_, 0) < 0)
+    ACE_ERROR ((LM_ERROR,
+                "Error:%p\n",
+                "Couldnt mask the RT completion signals"));
+  
+  // Setting up the handler(actually Null handler) for these signals.
+  struct sigaction reaction;
+  sigemptyset (&reaction.sa_mask);   // Nothing else to mask.
+  reaction.sa_flags = SA_SIGINFO;    // Realtime flag.
+#if defined (SA_SIGACTION)
+  // Lynx says, it is better to set this bit to be portable.
+  reaction.sa_flags &= SA_SIGACTION;
+#endif /* SA_SIGACTION */
+  reaction.sa_sigaction = 0;         // No handler.
+  int sigaction_return = sigaction (ACE_SIG_AIO,
+                                    &reaction,
+                                    0);
+  if (sigaction_return == -1)
+    ACE_ERROR ((LM_ERROR,
+                "Error:%p\n",
+                "Proactor couldnt do sigaction for the RT SIGNAL"));
+}
+
+
+ACE_POSIX_SIG_Proactor::~ACE_POSIX_SIG_Proactor (void)
+{
+  // @@ Enable the masked signals again.
+}
+
+int
+ACE_POSIX_SIG_Proactor::handle_events (ACE_Time_Value &wait_time)
+{
+  // Decrement <wait_time> with the amount of time spent in the method
+  ACE_Countdown_Time countdown (&wait_time);
+  return this->handle_events (wait_time.msec ());
+}
+
+int
+ACE_POSIX_SIG_Proactor::handle_events (void)
+{
+  return this->handle_events (ACE_INFINITE);
+}
+
+ACE_Asynch_Read_Stream_Impl *
+ACE_POSIX_SIG_Proactor::create_asynch_read_stream (void)
+{
+  ACE_Asynch_Read_Stream_Impl *implementation = 0;
+  ACE_NEW_RETURN (implementation, ACE_POSIX_SIG_Asynch_Read_Stream (this), 0);
+  return  implementation;
+}
+
+ACE_Asynch_Write_Stream_Impl *
+ACE_POSIX_SIG_Proactor::create_asynch_write_stream (void)
+{
+  ACE_Asynch_Write_Stream_Impl *implementation = 0;
+  ACE_NEW_RETURN (implementation, ACE_POSIX_SIG_Asynch_Write_Stream (this), 0);
+  return  implementation;
+}
+  
+ACE_Asynch_Read_File_Impl *
+ACE_POSIX_SIG_Proactor::create_asynch_read_file (void)
+{
+  ACE_Asynch_Read_File_Impl *implementation = 0;
+  ACE_NEW_RETURN (implementation, ACE_POSIX_SIG_Asynch_Read_File (this), 0);
+  return  implementation;
+}
+  
+ACE_Asynch_Write_File_Impl *
+ACE_POSIX_SIG_Proactor::create_asynch_write_file (void)
+{
+  ACE_Asynch_Write_File_Impl *implementation = 0;
+  ACE_NEW_RETURN (implementation, ACE_POSIX_SIG_Asynch_Write_File (this), 0);
+  return  implementation;
+} 
+  
+ACE_Asynch_Accept_Impl *
+ACE_POSIX_SIG_Proactor::create_asynch_accept (void)
+{
+  ACE_Asynch_Accept_Impl *implementation = 0;
+  ACE_NEW_RETURN (implementation, ACE_POSIX_SIG_Asynch_Accept (this), 0);
+  return implementation;
+}
+
+ACE_Asynch_Transmit_File_Impl *
+ACE_POSIX_SIG_Proactor::create_asynch_transmit_file (void)
+{
+  ACE_Asynch_Transmit_File_Impl *implementation = 0;
+  ACE_NEW_RETURN (implementation,
+                  ACE_POSIX_SIG_Asynch_Transmit_File (this),
+                  0);
+  return  implementation;
+}
+
+int
+ACE_POSIX_SIG_Proactor::handle_events (unsigned long milli_seconds)
+{
+  // Wait for <milli_seconds> amount of time.
+  // @@ Assigning <milli_seconds> to tv_sec.
+  timespec timeout;
+  timeout.tv_sec = milli_seconds;
+  timeout.tv_nsec = 0;
+  
+  // To get back the signal info.
+  siginfo_t sig_info;
+  
+  // Await the RT completion signal.
+  int sig_return = sigtimedwait (&this->RT_completion_signals_,
+                                 &sig_info,
+                                 &timeout);
+  
+  // Error case.
+  // If failure is coz of timeout, then return *0* but set
+  // errno appropriately. This is what the WinNT proactor
+  // does.
+  if (sig_return == -1)
+    ACE_ERROR_RETURN ((LM_ERROR,
+                       "Error:%p\n",
+                       "Waiting for RT completion signals"),
+                      0);
+  
+  // RT completion signals returned.
+  if (sig_return != ACE_SIG_AIO)
+    ACE_ERROR_RETURN ((LM_ERROR,
+                       "Unexpected signal (%d) has been received while waiting for RT Completion Signals\n",
+                       sig_return),
+                      -1);
+  
+  // @@ Debugging.
+  ACE_DEBUG ((LM_DEBUG,
+              "Sig number found in the sig_info block : %d\n",
+              sig_info.si_signo));
+  
+  // Is the signo returned consistent?
+  if (sig_info.si_signo != sig_return)
+    ACE_ERROR_RETURN ((LM_ERROR,
+                       "Inconsistent signal number (%d) in the signal info block\n",
+                       sig_info.si_signo),
+                      -1);
+  
+  // @@ Debugging.
+  ACE_DEBUG ((LM_DEBUG,
+              "Signal code for this signal delivery : %d\n",
+              sig_info.si_code));
+  
+  // Retrive the result pointer.
+  ACE_POSIX_Asynch_Result *asynch_result =
+    (ACE_POSIX_Asynch_Result *) sig_info.si_value.sival_ptr;
+  
+  // Check the <signal code> and act according to that.
+  if (sig_info.si_code == SI_ASYNCIO)
+    {
+      // Retrieve the aiocb from Result ptr.
+      // @@ Some checking should be done to make sure this pointer
+      // is valid. Otherwise <aio_error> will bomb.
+      aiocb* aiocb_ptr =
+        (aiocb *)asynch_result;
+      
+      // Analyze error and return values. Return values are
+      // actually <errno>'s associated with the <aio_> call
+      // corresponding to aiocb_ptr.
+      int error_status = aio_error (aiocb_ptr);
+      if (error_status == -1)
+        ACE_ERROR_RETURN ((LM_ERROR,
+                           "Error:%p\n",
+                           "Invalid control block was sent to <aio_error> for compleion querying"),
+                          -1);
+      
+      // Completion signal has been received, so it can't be in
+      // progress.  
+      // ACE_ASSERT (error_status != EINPROGRESS)
+      
+      // No error occured in the AIO operation.
+      int return_status = aio_return (aiocb_ptr);
+      if (return_status == -1)
+        {
+          ACE_ERROR_RETURN ((LM_ERROR,
+                             "Error:%p\n",
+                             "Invalid control block was send to <aio_return>"),
+                            -1);
+        }
+      else
+        {
+          ACE_DEBUG ((LM_DEBUG, "An aio has finished\n"));
+
+          this->application_specific_code (asynch_result,
+                                           return_status,
+                                           1,  // Result : True.
+                                           0,  // No completion_signal.
+                                           error_status); // Error.
+        }
+    }
+  else if (sig_info.si_code == SI_QUEUE)
+    {
+      // @@ Just debugging.
+      ACE_DEBUG ((LM_DEBUG, "<sigqueue>'d signal received\n"));
+      
+      this->application_specific_code (asynch_result,
+                                       0, // No bytes transferred.
+                                       1, // Result : True.
+                                       0, // No completion key.
+                                       0); // No error.
+    }
+  else
+    // Unknown signal code.
+    ACE_ERROR_RETURN ((LM_DEBUG,
+                       "Unexpected signal code (%d) returned on completion querying\n",
+                       sig_info.si_code),
+                      -1);
+  
+  return 0;
+}
+
+#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)
+#if 0
+template class ACE_Timer_Queue_T<ACE_Handler *,
+  ACE_Proactor_Handle_Timeout_Upcall,
+  ACE_SYNCH_RECURSIVE_MUTEX>;
+template class ACE_Timer_Queue_Iterator_T<ACE_Handler *,
+  ACE_Proactor_Handle_Timeout_Upcall,
+  ACE_SYNCH_RECURSIVE_MUTEX>;
+template class ACE_Timer_List_T<ACE_Handler *,
+  ACE_Proactor_Handle_Timeout_Upcall,
+  ACE_SYNCH_RECURSIVE_MUTEX>;
+template class ACE_Timer_List_Iterator_T<ACE_Handler *,
+  ACE_Proactor_Handle_Timeout_Upcall,
+  ACE_SYNCH_RECURSIVE_MUTEX>;
+template class ACE_Timer_Node_T<ACE_Handler *>;
+template class ACE_Unbounded_Set<ACE_Timer_Node_T<ACE_Handler *> *>;
+template class ACE_Unbounded_Set_Iterator<ACE_Timer_Node_T<ACE_Handler *> *>;
+template class ACE_Node <ACE_Timer_Node_T<ACE_Handler *> *>;
+template class ACE_Free_List<ACE_Timer_Node_T<ACE_Handler *> >;
+template class ACE_Locked_Free_List<ACE_Timer_Node_T<ACE_Handler *>, ACE_Null_Mutex>;
+template class ACE_Timer_Heap_T<ACE_Handler *,
+  ACE_Proactor_Handle_Timeout_Upcall,
+  ACE_SYNCH_RECURSIVE_MUTEX>;
+template class ACE_Timer_Heap_Iterator_T<ACE_Handler *,
+  ACE_Proactor_Handle_Timeout_Upcall,
+  ACE_SYNCH_RECURSIVE_MUTEX>;
+template class ACE_Timer_Wheel_T<ACE_Handler *,
+  ACE_Proactor_Handle_Timeout_Upcall,
+  ACE_SYNCH_RECURSIVE_MUTEX>;
+template class ACE_Timer_Wheel_Iterator_T<ACE_Handler *,
+  ACE_Proactor_Handle_Timeout_Upcall,
+  ACE_SYNCH_RECURSIVE_MUTEX>;
+#endif /* 0 */
+#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA)
+#pragma instantiate ACE_Timer_Queue_T<ACE_Handler *,\
+        ACE_Proactor_Handle_Timeout_Upcall, ACE_SYNCH_RECURSIVE_MUTEX>
+#pragma instantiate ACE_Timer_Queue_Iterator_T<ACE_Handler *,\
+        ACE_Proactor_Handle_Timeout_Upcall, ACE_SYNCH_RECURSIVE_MUTEX>
+#pragma instantiate ACE_Timer_List_T<ACE_Handler *,\
+        ACE_Proactor_Handle_Timeout_Upcall, ACE_SYNCH_RECURSIVE_MUTEX>
+#pragma instantiate ACE_Timer_List_Iterator_T<ACE_Handler *,\
+        ACE_Proactor_Handle_Timeout_Upcall, ACE_SYNCH_RECURSIVE_MUTEX>
+#pragma instantiate ACE_Timer_Heap_T<ACE_Handler *,\
+        ACE_Proactor_Handle_Timeout_Upcall, ACE_SYNCH_RECURSIVE_MUTEX>
+#pragma instantiate ACE_Timer_Heap_Iterator_T<ACE_Handler *,\
+        ACE_Proactor_Handle_Timeout_Upcall, ACE_SYNCH_RECURSIVE_MUTEX>
+#pragma instantiate ACE_Timer_Wheel_T<ACE_Handler *,
+        ACE_Proactor_Handle_Timeout_Upcall, ACE_SYNCH_RECURSIVE_MUTEX>
+#pragma instantiate ACE_Timer_Wheel_Iterator_T<ACE_Handler *,\
+        ACE_Proactor_Handle_Timeout_Upcall, ACE_SYNCH_RECURSIVE_MUTEX>
+#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */
+
+#endif /* ACE_HAS_AIO_CALLS */