/* -*- c++ -*- */
/*
 * Copyright 2008,2009,2013 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 this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <gnuradio/block.h>
#include <gnuradio/block_detail.h>
#include <gnuradio/buffer.h>
#include <gnuradio/tpb_detail.h>

namespace gr {

/*
 * We assume that no worker threads are ever running when the graph
 * structure is being manipulated, thus it's safe for us to poke
 * around in our neighbors w/o holding any locks.
 */
void tpb_detail::notify_upstream(block_detail* d)
{
    // For each of our inputs, tell the guy upstream that we've
    // consumed some input, and that he most likely has more output
    // buffer space available.

    for (size_t i = 0; i < d->d_input.size(); i++) {
        // Can you say, "pointer chasing?"
        d->d_input[i]->buffer()->link()->detail()->d_tpb.set_output_changed();
    }
}

void tpb_detail::notify_downstream(block_detail* d)
{
    // For each of our outputs, tell the guys downstream that they
    // have new input available.

    for (size_t i = 0; i < d->d_output.size(); i++) {
        buffer_sptr buf = d->d_output[i];
        for (size_t j = 0, k = buf->nreaders(); j < k; j++)
            buf->reader(j)->link()->detail()->d_tpb.set_input_changed();
    }
}

void tpb_detail::notify_neighbors(block_detail* d)
{
    notify_downstream(d);
    notify_upstream(d);
}

} /* namespace gr */
