gr_vmcircbuf_sysv_shm.h

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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_SYSV_SHM_H_
#define _GR_VMCIRCBUF_SYSV_SHM_H_

#include <gr_core_api.h>
#include <gr_vmcircbuf.h>

/*!
 * \brief concrete class to implement circular buffers with mmap and shm_open
 * \ingroup internal
 */
class GR_CORE_API gr_vmcircbuf_sysv_shm : public gr_vmcircbuf {
 public:

  // CREATORS

  gr_vmcircbuf_sysv_shm (int size);
  virtual ~gr_vmcircbuf_sysv_shm ();
};

/*!
 * \brief concrete factory for circular buffers built using mmap and shm_open
 */
class GR_CORE_API gr_vmcircbuf_sysv_shm_factory : public gr_vmcircbuf_factory {
 private:
  static gr_vmcircbuf_factory   *s_the_factory;

 public:
  static gr_vmcircbuf_factory *singleton ();

  virtual const char *name () const { return "gr_vmcircbuf_sysv_shm_factory"; }

  /*!
   * \brief return granularity of mapping, typically equal to page size
   */
  virtual int granularity ();

  /*!
   * \brief return a gr_vmcircbuf, or 0 if unable.
   *
   * Call this to create a doubly mapped circular buffer.
   */
  virtual gr_vmcircbuf *make (int size);
};

#endif /* _GR_VMCIRCBUF_SYSV_SHM_H_ */