86 lines
2.0 KiB
C++
86 lines
2.0 KiB
C++
/* -*- c++ -*- */
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/*
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* Copyright 2005,2009 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*
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*/
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#ifndef INCLUDED_OP25_MSG_QUEUE_H
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#define INCLUDED_OP25_MSG_QUEUE_H
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#include <op25/api.h>
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#include <op25/msg_handler.h>
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#include <gnuradio/thread/thread.h>
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namespace gr {
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namespace op25 {
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/*!
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* \brief thread-safe message queue
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* \ingroup misc
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*/
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class OP25_API msg_queue : public msg_handler
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{
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gr::thread::mutex d_mutex;
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gr::thread::condition_variable d_not_empty;
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gr::thread::condition_variable d_not_full;
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message::sptr d_head;
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message::sptr d_tail;
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unsigned int d_count; // # of messages in queue.
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unsigned int d_limit; // max # of messages in queue. 0 -> unbounded
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public:
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typedef std::shared_ptr<msg_queue> sptr;
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static sptr make(unsigned int limit = 0);
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msg_queue(unsigned int limit);
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~msg_queue() override;
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//! Generic msg_handler method: insert the message.
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void handle(message::sptr msg) override { insert_tail(msg); }
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/*!
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* \brief Insert message at tail of queue.
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* \param msg message
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*
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* Block if queue if full.
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*/
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void insert_tail(message::sptr msg);
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/*!
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* \brief Delete message from head of queue and return it.
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* Block if no message is available.
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*/
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message::sptr delete_head();
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/*!
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* \brief If there's a message in the q, delete it and return it.
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* If no message is available, return 0.
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*/
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message::sptr delete_head_nowait();
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//! Delete all messages from the queue
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void flush();
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//! is the queue empty?
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bool empty_p() const { return d_count == 0; }
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//! is the queue full?
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bool full_p() const { return d_limit != 0 && d_count >= d_limit; }
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//! return number of messages in queue
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unsigned int count() const { return d_count; }
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//! return limit on number of message in queue. 0 -> unbounded
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unsigned int limit() const { return d_limit; }
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};
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} /* namespace op25 */
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} /* namespace gr */
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#endif /* INCLUDED_OP25_MSG_QUEUE_H */
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