/* -*- c++ -*- */
/*
 * Copyright 2005 Free Software Foundation, Inc.
 * 
 * This file is part of GNU Radio
 * 
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 * 
 * GNU Radio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef INCLUDED_GR_DISPATCHER_H
#define INCLUDED_GR_DISPATCHER_H

#include <gr_select_handler.h>
#include <vector>

class gr_dispatcher;
typedef boost::shared_ptr<gr_dispatcher> gr_dispatcher_sptr;

gr_dispatcher_sptr gr_dispatcher_singleton();
gr_dispatcher_sptr gr_make_dispatcher();

/*!
 * \brief invoke callbacks based on select.
 * \ingroup internal
 *
 * \sa gr_select_handler
 */
class gr_dispatcher
{
  gr_dispatcher();
  friend gr_dispatcher_sptr gr_make_dispatcher();

  std::vector<gr_select_handler_sptr> d_handler;
  int			      	      d_max_index;

public:
  ~gr_dispatcher();

  bool add_handler(gr_select_handler_sptr handler);
  bool del_handler(gr_select_handler_sptr handler);
  bool del_handler(gr_select_handler *handler);

  /*!
   * \brief Event dispatching loop.
   *
   * Enter a polling loop that only terminates after all gr_select_handlers
   * have been removed.  \p timeout sets the timeout parameter to the select()
   * call, measured in seconds.
   *
   * \param timeout maximum number of seconds to block in select.
   */
  void loop(double timeout=10);
};

#endif /* INCLUDED_GR_DISPATCHER_H */
