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/* -*- c++ -*- */
/*
* Copyright 2003,2013 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef GR_VMCIRCBUF_H
#define GR_VMCIRCBUF_H
#include <gnuradio/api.h>
#include <gnuradio/logger.h>
#include <gnuradio/prefs.h>
#include <gnuradio/thread/thread.h>
#include <vector>
extern gr::thread::mutex s_vm_mutex;
namespace gr {
/*!
* \brief abstract class to implement doubly mapped virtual memory circular buffers
* \ingroup internal
*/
class GR_RUNTIME_API vmcircbuf
{
protected:
int d_size;
char* d_base;
logger_ptr d_logger;
logger_ptr d_debug_logger;
// CREATORS
vmcircbuf(int size) : d_size(size), d_base(0)
{
gr::configure_default_loggers(d_logger, d_debug_logger, "gr::vmcircbuf");
};
public:
virtual ~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_RUNTIME_API vmcircbuf_factory
{
protected:
vmcircbuf_factory(){};
virtual ~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 vmcircbuf* make(int size) = 0;
};
/*
* \brief pulls together all implementations of gr::vmcircbuf
*/
class GR_RUNTIME_API 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 vmcircbuf_factory* get_default_factory();
static int granularity() { return get_default_factory()->granularity(); }
static 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<vmcircbuf_factory*> all_factories();
// make this factory the default
static void set_default_factory(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(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);
};
} /* namespace gr */
#endif /* GR_VMCIRCBUF_H */
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