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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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gnuradio/messages/msg_queue.h>
#include <stdexcept>
namespace gr {
namespace messages {
msg_queue_sptr
make_msg_queue(unsigned int limit)
{
return msg_queue_sptr(new msg_queue(limit));
}
msg_queue::msg_queue(unsigned int limit)
: d_limit(limit)
{
}
msg_queue::~msg_queue()
{
flush();
}
void
msg_queue::insert_tail(pmt::pmt_t msg)
{
gr::thread::scoped_lock guard(d_mutex);
while(full_p())
d_not_full.wait(guard);
d_msgs.push_back(msg);
d_not_empty.notify_one();
}
pmt::pmt_t
msg_queue::delete_head()
{
gr::thread::scoped_lock guard(d_mutex);
while(empty_p())
d_not_empty.wait(guard);
pmt::pmt_t m(d_msgs.front());
d_msgs.pop_front();
if(d_limit > 0) // Unlimited length queues never block on write
d_not_full.notify_one();
return m;
}
pmt::pmt_t
msg_queue::delete_head_nowait()
{
gr::thread::scoped_lock guard(d_mutex);
if(empty_p())
return pmt::pmt_t();
pmt::pmt_t m(d_msgs.front());
d_msgs.pop_front();
if(d_limit > 0) // Unlimited length queues never block on write
d_not_full.notify_one();
return m;
}
void
msg_queue::flush()
{
while(delete_head_nowait() != pmt::pmt_t())
;
}
} /* namespace messages */
} /* namespace gr */
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