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/* -*- c++ -*- */
/*
* Copyright 2008 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.
*/
#ifndef INCLUDED_RING_H
#define INCLUDED_RING_H
#include <gnuradio/omnithread.h>
#include <stddef.h>
#include <vector>
#include <boost/shared_ptr.hpp>
namespace usrp2 {
class ring;
typedef boost::shared_ptr<ring> ring_sptr;
class ring
{
private:
size_t d_max;
size_t d_read_ind;
size_t d_write_ind;
struct ring_desc
{
void *d_base;
size_t d_len;
};
std::vector<ring_desc> d_ring;
omni_mutex d_mutex;
omni_condition d_not_empty;
void inc_read_ind()
{
if (d_read_ind + 1 >= d_max)
d_read_ind = 0;
else
d_read_ind = d_read_ind + 1;
}
void inc_write_ind()
{
if (d_write_ind + 1 >= d_max)
d_write_ind = 0;
else
d_write_ind = d_write_ind + 1;
}
bool empty() const { return d_read_ind == d_write_ind; }
bool full() const { return (d_write_ind+1)%d_max == d_read_ind; }
public:
ring(unsigned int entries);
void wait_for_not_empty();
bool enqueue(void *p, size_t len);
bool dequeue(void **p, size_t *len);
};
} // namespace usrp2
#endif /* INCLUDED_RING_H */
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