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/* -*- c++ -*- */
/*
* Copyright 2009,2013 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_MSG_QUEUE_H
#define INCLUDED_MSG_QUEUE_H
#include <gnuradio/api.h>
#include <gnuradio/thread/thread.h>
#include <pmt/pmt.h>
#include <deque>
namespace gr {
namespace messages {
class msg_queue;
typedef boost::shared_ptr<msg_queue> msg_queue_sptr;
msg_queue_sptr make_msg_queue(unsigned int limit=0);
/*!
* \brief thread-safe message queue
*/
class GR_RUNTIME_API msg_queue
{
private:
gr::thread::mutex d_mutex;
gr::thread::condition_variable d_not_empty;
gr::thread::condition_variable d_not_full;
unsigned int d_limit; // max # of messages in queue. 0 -> unbounded
std::deque<pmt::pmt_t> d_msgs;
public:
msg_queue(unsigned int limit);
~msg_queue();
/*!
* \brief Insert message at tail of queue.
* \param msg message
*
* Block if queue if full.
*/
void insert_tail(pmt::pmt_t msg);
/*!
* \brief Delete message from head of queue and return it.
* Block if no message is available.
*/
pmt::pmt_t delete_head();
/*!
* \brief If there's a message in the q, delete it and return it.
* If no message is available, return pmt::pmt_t().
*/
pmt::pmt_t delete_head_nowait();
//! Delete all messages from the queue
void flush();
//! is the queue empty?
bool empty_p() const { return d_msgs.empty(); }
//! is the queue full?
bool full_p() const { return d_limit != 0 && count() >= d_limit; }
//! return number of messages in queue
unsigned int count() const { return d_msgs.size(); }
//! return limit on number of message in queue. 0 -> unbounded
unsigned int limit() const { return d_limit; }
};
} /* namespace messages */
} /* namespace gr */
#endif /* INCLUDED_MSG_QUEUE_H */
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