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/* -*- 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_SELECT_HANDLER_H
#define INCLUDED_GR_SELECT_HANDLER_H
#include <gr_runtime_api.h>
#include <boost/shared_ptr.hpp>
class gr_select_handler;
typedef boost::shared_ptr<gr_select_handler> gr_select_handler_sptr;
/*!
* \brief Abstract handler for select based notification.
* \ingroup base
*
* \sa gr_dispatcher
*/
class GR_RUNTIME_API gr_select_handler
{
int d_fd;
protected:
gr_select_handler(int file_descriptor);
public:
virtual ~gr_select_handler();
int fd() const { return d_fd; }
int file_descriptor() const { return d_fd; }
/*!
* \brief Called when file_descriptor is readable.
*
* Called when the dispatcher detects that file_descriptor can
* be read without blocking.
*/
virtual void handle_read() = 0;
/*!
* \brief Called when file_descriptor is writable.
*
* Called when dispatcher detects that file descriptor can be
* written without blocking.
*/
virtual void handle_write() = 0;
/*!
* Called each time around the dispatcher loop to determine whether
* this handler's file descriptor should be added to the list on which
* read events can occur. The default method returns true, indicating
* that by default, all handlers are interested in read events.
*/
virtual bool readable() { return true; }
/*!
* Called each time around the dispatcher loop to determine whether
* this handler's file descriptor should be added to the list on which
* write events can occur. The default method returns true, indicating
* that by default, all handlers are interested in write events.
*/
virtual bool writable() { return true; }
};
#endif /* INCLUDED_GR_SELECT_HANDLER_H */
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