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/* -*- c++ -*- */
/*
* Copyright 2005,2009 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_MSG_QUEUE_H
#define INCLUDED_GR_MSG_QUEUE_H
#include <gr_core_api.h>
#include <gr_msg_handler.h>
#include <gruel/thread.h>
class gr_msg_queue;
typedef boost::shared_ptr<gr_msg_queue> gr_msg_queue_sptr;
GR_CORE_API gr_msg_queue_sptr gr_make_msg_queue(unsigned int limit=0);
/*!
* \brief thread-safe message queue
* \ingroup misc
*/
class GR_CORE_API gr_msg_queue : public gr_msg_handler {
gruel::mutex d_mutex;
gruel::condition_variable d_not_empty;
gruel::condition_variable d_not_full;
gr_message_sptr d_head;
gr_message_sptr d_tail;
unsigned int d_count; // # of messages in queue.
unsigned int d_limit; // max # of messages in queue. 0 -> unbounded
public:
gr_msg_queue(unsigned int limit);
~gr_msg_queue();
//! Generic msg_handler method: insert the message.
void handle(gr_message_sptr msg) { insert_tail (msg); }
/*!
* \brief Insert message at tail of queue.
* \param msg message
*
* Block if queue if full.
*/
void insert_tail(gr_message_sptr msg);
/*!
* \brief Delete message from head of queue and return it.
* Block if no message is available.
*/
gr_message_sptr delete_head();
/*!
* \brief If there's a message in the q, delete it and return it.
* If no message is available, return 0.
*/
gr_message_sptr delete_head_nowait();
//! Delete all messages from the queue
void flush();
//! is the queue empty?
bool empty_p() const { return d_count == 0; }
//! is the queue full?
bool full_p() const { return d_limit != 0 && d_count >= d_limit; }
//! return number of messages in queue
unsigned int count() const { return d_count; }
//! return limit on number of message in queue. 0 -> unbounded
unsigned int limit() const { return d_limit; }
};
#endif /* INCLUDED_GR_MSG_QUEUE_H */
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