/* -*- c++ -*- */
/*
 * Copyright 2012-2013 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 "message_strobe_impl.h"
#include <gnuradio/io_signature.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <cstdio>
#include <iostream>
#include <stdexcept>

namespace gr {
namespace blocks {

message_strobe::sptr message_strobe::make(pmt::pmt_t msg, long period_ms)
{
    return gnuradio::get_initial_sptr(new message_strobe_impl(msg, period_ms));
}

message_strobe_impl::message_strobe_impl(pmt::pmt_t msg, long period_ms)
    : block("message_strobe", io_signature::make(0, 0, 0), io_signature::make(0, 0, 0)),
      d_finished(false),
      d_period_ms(period_ms),
      d_msg(msg),
      d_port(pmt::mp("strobe"))
{
    message_port_register_out(d_port);

    message_port_register_in(pmt::mp("set_msg"));
    set_msg_handler(pmt::mp("set_msg"),
                    boost::bind(&message_strobe_impl::set_msg, this, _1));
}

message_strobe_impl::~message_strobe_impl() {}

bool message_strobe_impl::start()
{
    // NOTE: d_finished should be something explicitly thread safe. But since
    // nothing breaks on concurrent access, I'll just leave it as bool.
    d_finished = false;
    d_thread = boost::shared_ptr<gr::thread::thread>(
        new gr::thread::thread(boost::bind(&message_strobe_impl::run, this)));

    return block::start();
}

bool message_strobe_impl::stop()
{
    // Shut down the thread
    d_finished = true;
    d_thread->interrupt();
    d_thread->join();

    return block::stop();
}

void message_strobe_impl::run()
{
    while (!d_finished) {
        boost::this_thread::sleep(
            boost::posix_time::milliseconds(static_cast<long>(d_period_ms)));
        if (d_finished) {
            return;
        }

        message_port_pub(d_port, d_msg);
    }
}

} /* namespace blocks */
} /* namespace gr */
