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/* -*- c++ -*- */
/*
* Copyright 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
#ifdef HAVE_IO_H
#include <io.h>
#endif
#include <gr_pdu.h>
#include <gr_basic_block.h>
#include "stream_pdu_base.h"
#include <boost/format.hpp>
static const long timeout_us = 100*1000; //100ms
namespace gr {
namespace blocks {
stream_pdu_base::stream_pdu_base(int MTU)
: d_fd(-1),
d_started(false),
d_finished(false)
{
// reserve space for rx buffer
d_rxbuf.resize(MTU,0);
}
stream_pdu_base::~stream_pdu_base()
{
stop_rxthread();
}
void
stream_pdu_base::start_rxthread(gr_basic_block *blk, pmt::pmt_t port)
{
d_blk = blk;
d_port = port;
d_thread = gruel::thread(boost::bind(&stream_pdu_base::run, this));
d_started = true;
}
void
stream_pdu_base::stop_rxthread()
{
d_finished = true;
if (d_started) {
d_thread.interrupt();
d_thread.join();
}
}
void
stream_pdu_base::run()
{
while(!d_finished) {
if (!wait_ready())
continue;
const int result = read(d_fd, &d_rxbuf[0], d_rxbuf.size());
if (result <= 0)
throw std::runtime_error("stream_pdu_base, bad socket read!");
pmt::pmt_t vector = pmt::pmt_init_u8vector(result, &d_rxbuf[0]);
pmt::pmt_t pdu = pmt::pmt_cons(pmt::PMT_NIL, vector);
d_blk->message_port_pub(d_port, pdu);
}
}
bool
stream_pdu_base::wait_ready()
{
//setup timeval for timeout
timeval tv;
tv.tv_sec = 0;
tv.tv_usec = timeout_us;
//setup rset for timeout
fd_set rset;
FD_ZERO(&rset);
FD_SET(d_fd, &rset);
//call select with timeout on receive socket
return ::select(d_fd+1, &rset, NULL, NULL, &tv) > 0;
}
void
stream_pdu_base::send(pmt::pmt_t msg)
{
pmt::pmt_t vector = pmt::pmt_cdr(msg);
size_t offset(0);
size_t itemsize(::gr_pdu_itemsize(type_from_pmt(vector)));
int len(pmt::pmt_length(vector)*itemsize);
const int rv = write(d_fd, pmt::pmt_uniform_vector_elements(vector, offset), len);
if (rv != len) {
std::cerr << boost::format("WARNING: gr_stream_pdu_base::send(pdu) write failed! (d_fd=%d, len=%d, rv=%d)")
% d_fd % len % rv << std::endl;
}
}
} /* namespace blocks */
} /* namespace gr */
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