spipe-acceptor.cpp

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// $Id: SPIPE-acceptor.cpp 80826 2008-03-04 14:51:23Z wotte $

#if !defined (SPIPE_ACCEPTOR_C)
#define SPIPE_ACCEPTOR_C

#include "ace/OS_NS_string.h"
#include "ace/SPIPE_Addr.h"
#include "ace/SPIPE_Acceptor.h"
#include "ace/Proactor.h"
#include "ace/Get_Opt.h"
#include "ace/Signal.h"
#include "SPIPE-acceptor.h"

ACE_RCSID(blocking, SPIPE_acceptor, "$Id: SPIPE-acceptor.cpp 80826 2008-03-04 14:51:23Z wotte $")

#if defined (ACE_HAS_WIN32_OVERLAPPED_IO) || defined (ACE_HAS_AIO_CALLS)

Svc_Handler::Svc_Handler (void)
  : mb_ (BUFSIZ + 1)
{
  // An extra byte for null termination.
  this->mb_.size (BUFSIZ);
}

Svc_Handler::~Svc_Handler (void)
{
}

int
Svc_Handler::open (void *)
{
  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("client connected on handle %d\n"),
              this->peer ().get_handle ()));
  if (this->ar_.open (*this,
                      this->peer ().get_handle ()) == -1)
    return -1;
  return this->ar_.read (this->mb_,
                         this->mb_.size ());
}

void
Svc_Handler::handle_read_stream (const ACE_Asynch_Read_Stream::Result &result)
{
  if (result.success () && result.bytes_transferred () > 0)
    {
      result.message_block ().rd_ptr ()[result.message_block ().length ()] = '\0';

      // Print out the message received from the server.
      ACE_DEBUG ((LM_DEBUG,
                  ACE_TEXT ("(%t) message size %d.\n"),
                  result.message_block ().length ()));
      ACE_DEBUG ((LM_DEBUG,
                  ACE_TEXT ("%C"),
                  result.message_block ().rd_ptr ()));
      // Reset the message block here to make sure multiple writes to
      // the pipe don't keep appending to the message_block!
      this->mb_.reset ();

      this->ar_.read (this->mb_, this->mb_.size ());
    }
  else
    ACE_Proactor::end_event_loop ();
}

IPC_Server::IPC_Server (void)
  : n_threads_ (1),
    shutdown_ (0)
{
  ACE_OS::strcpy (rendezvous_, ACE_TEXT ("acepipe"));
}

IPC_Server::~IPC_Server (void)
{
}

int
IPC_Server::handle_signal (int,
                           siginfo_t *,
                           ucontext_t *)
{
  ACE_LOG_MSG->log (LM_INFO, ACE_TEXT ("IPC_Server::handle_signal().\n"));

  // Flag the main <svc> loop to shutdown.
  this->shutdown_ = 1;

  this->acceptor ().close (); // Close underlying acceptor.
  // This should cause the <accept> to fail, which will "bounce"
  // us out of the loop in <svc>.
  return 0;
}

int
IPC_Server::init (int argc, ACE_TCHAR *argv[])
{
  if (this->parse_args (argc, argv) == -1)
    return -1;

  ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("Opening %s\n"), rendezvous_));

  // Initialize named pipe listener.
  if (this->open (ACE_SPIPE_Addr (rendezvous_)) == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("%p\n"),
                       ACE_TEXT ("open")), 1);

  // Register to receive shutdowns using this handler.
  else if (ACE_Reactor::instance ()->register_handler
      (SIGINT, this) == -1)
    return -1;
  else
    return 0;
}

int
IPC_Server::fini (void)
{
  return 0;
}

int
IPC_Server::parse_args (int argc, ACE_TCHAR *argv[])
{
  ACE_LOG_MSG->open (argv[0]);

  ACE_Get_Opt get_opt (argc, argv, ACE_TEXT ("ut:r:"));

  for (int c; (c = get_opt ()) != -1; )
    {
      switch (c)
        {
        case 'r':
          ACE_OS::strncpy (rendezvous_,
                           get_opt.opt_arg (),
                           sizeof (rendezvous_) / sizeof (ACE_TCHAR));
          break;
        case 't':
          n_threads_ = ACE_OS::atoi (get_opt.opt_arg ());
                                     ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("%s == %d.\n"),
                                     get_opt.opt_arg (),
                                     n_threads_));
          ACE_Proactor::instance (2 * n_threads_);
          // This is a lame way to tell the proactor how many threads
          // we'll be using.
          break;
        case 'u':
        default:
          ACE_ERROR_RETURN ((LM_ERROR,
                            ACE_TEXT ("usage: %n -t <threads>\n")
                            ACE_TEXT (" -r <rendezvous>\n")), -1);
        }
    }

  return 0;
}

static ACE_THR_FUNC_RETURN
run_reactor_event_loop (void *)
{
  ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("(%t) worker thread starting\n")));

  ACE_Proactor::run_event_loop ();
  return 0;
}

int
IPC_Server::svc (void)
{
  // Performs the iterative server activities.
  while (this->shutdown_ == 0)
    {
      Svc_Handler sh;

      // Create a new SH endpoint, which performs all processing in
      // its open() method (note no automatic restart if errno ==
      // EINTR).
      if (this->accept (&sh, 0) == -1)
        ACE_ERROR_RETURN ((LM_ERROR,
                           ACE_TEXT ("%p\n"),
                           ACE_TEXT ("accept")),
                          1);

      // SH's destructor closes the stream implicitly but the
      // listening endpoint stays open.
      else
        {
          // Run single-threaded.
          if (n_threads_ <= 1)
            run_reactor_event_loop (0);
          else
            {
              if (ACE_Thread_Manager::instance ()->spawn_n
                   (n_threads_,
                    run_reactor_event_loop,
                    0,
                    THR_NEW_LWP) == -1)
                ACE_ERROR_RETURN ((LM_ERROR,
                                   ACE_TEXT ("%p\n"),
                                   ACE_TEXT ("spawn_n")),
                                  1);

              ACE_Thread_Manager::instance ()->wait ();
            }

          ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("(%t) main thread exiting.\n")));

          // Reset the Proactor so another accept will work.
          ACE_Proactor::reset_event_loop();

          // Must use some other method now to terminate this thing
          // instead of the ACE_Signal_Adapter just running
          // ACE_Proactor::end_event_loop()...  Since this is an
          // ACE_Event_Handler, doesn't it seem possible to implement
          // a handle_signal() hook, and catch the signal there?
        }
    }

  /* NOTREACHED */
  return 0;
}

#endif /* ACE_HAS_WIN32_OVERLAPPED_IO || ACE_HAS_AIO_CALLS */
#endif /* SPIPE_ACCEPTOR_C */