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/* -*- c++ -*- */
/*
* Copyright 2013-2014 Sylvain Munaut <tnt@246tNt.com>
*
* This 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.
*
* This software 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 software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include <gnuradio/thread/thread.h>
#include "fifo.h"
namespace gr {
namespace fosphor {
fifo::fifo(int length) :
d_len(length), d_rp(0), d_wp(0)
{
this->d_buf = new gr_complex[this->d_len];
}
fifo::~fifo()
{
delete[] this->d_buf;
}
int
fifo::free()
{
return (this->d_len - 1) - this->used();
}
int
fifo::used()
{
return (this->d_wp - this->d_rp) & (this->d_len - 1);
}
int
fifo::write_max_size()
{
return this->d_len - this->d_wp;
}
gr_complex *
fifo::write_prepare(int size, bool wait)
{
gr::thread::scoped_lock lock(this->d_mutex);
if (!wait && (this->free() < size))
return NULL;
while (this->free() < size)
this->d_cond_full.wait(lock);
return &this->d_buf[this->d_wp];
}
void
fifo::write_commit(int size)
{
gr::thread::scoped_lock lock(this->d_mutex);
this->d_wp = (this->d_wp + size) & (this->d_len - 1);
this->d_cond_empty.notify_one();
}
int
fifo::read_max_size()
{
return this->d_len - this->d_rp;
}
gr_complex *
fifo::read_peek(int size, bool wait)
{
gr::thread::scoped_lock lock(this->d_mutex);
if (!wait && (this->used() < size))
return NULL;
while (this->used() < size)
this->d_cond_empty.wait(lock);
return &this->d_buf[this->d_rp];
}
void
fifo::read_discard(int size)
{
gr::thread::scoped_lock lock(this->d_mutex);
this->d_rp = (this->d_rp + size) & (this->d_len - 1);
this->d_cond_full.notify_one();
}
} /* namespace fosphor */
} /* namespace gr */
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