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/* -*- c++ -*- */
/*
* Copyright 2003 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.
*/
#ifndef _GR_VMCIRCBUF_H_
#define _GR_VMCIRCBUF_H_
#include <vector>
/*!
* \brief abstract class to implement doubly mapped virtual memory circular buffers
* \ingroup internal
*/
class gr_vmcircbuf {
protected:
int d_size;
char *d_base;
// CREATORS
gr_vmcircbuf (int size) : d_size (size), d_base (0) {};
public:
virtual ~gr_vmcircbuf ();
// ACCESSORS
void *pointer_to_first_copy () const { return d_base; }
void *pointer_to_second_copy () const { return d_base + d_size; }
};
/*!
* \brief abstract factory for creating circular buffers
*/
class gr_vmcircbuf_factory {
protected:
gr_vmcircbuf_factory () {};
virtual ~gr_vmcircbuf_factory ();
public:
/*!
* \brief return name of this factory
*/
virtual const char *name () const = 0;
/*!
* \brief return granularity of mapping, typically equal to page size
*/
virtual int granularity () = 0;
/*!
* \brief return a gr_vmcircbuf, or 0 if unable.
*
* Call this to create a doubly mapped circular buffer.
*/
virtual gr_vmcircbuf *make (int size) = 0;
};
/*
* \brief pulls together all implementations of gr_vmcircbuf
*/
class gr_vmcircbuf_sysconfig {
public:
/*
* \brief return the single instance of the default factory.
*
* returns the default factory to use if it's already defined,
* else find the first working factory and use it.
*/
static gr_vmcircbuf_factory *get_default_factory ();
static int granularity () { return get_default_factory()->granularity(); }
static gr_vmcircbuf *make (int size) { return get_default_factory()->make(size); }
// N.B. not all factories are guaranteed to work.
// It's too hard to check everything at config time, so we check at runtime
static std::vector<gr_vmcircbuf_factory *> all_factories ();
// make this factory the default
static void set_default_factory (gr_vmcircbuf_factory *f);
/*!
* \brief Does this factory really work?
*
* verbose = 0: silent
* verbose = 1: names of factories tested and results
* verbose = 2: all intermediate results
*/
static bool test_factory (gr_vmcircbuf_factory *f, int verbose);
/*!
* \brief Test all factories, return true if at least one of them works
* verbose = 0: silent
* verbose = 1: names of factories tested and results
* verbose = 2: all intermediate results
*/
static bool test_all_factories (int verbose);
};
#endif /* _GR_VMCIRCBUF_H_ */
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