GNU Radio 3.4.0 C++ API
gr_vmcircbuf_createfilemapping.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2003,2005 Free Software Foundation, Inc.
00004  *
00005  * This file is part of GNU Radio
00006  *
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 3, or (at your option)
00010  * any later version.
00011  *
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 51 Franklin Street,
00020  * Boston, MA 02110-1301, USA.
00021  */
00022 
00023 #ifndef _GR_VMCIRCBUF_CREATEFILEMAPPING_H_
00024 #define _GR_VMCIRCBUF_CREATEFILEMAPPING_H_
00025 
00026 #include <gr_vmcircbuf.h>
00027 
00028 #ifdef HAVE_CREATEFILEMAPPING
00029 #include <windows.h>
00030 #endif
00031 /*!
00032  * \brief concrete class to implement circular buffers with mmap and shm_open
00033  * \ingroup internal
00034  */
00035 class gr_vmcircbuf_createfilemapping : public gr_vmcircbuf
00036 {
00037  public:
00038    // CREATORS
00039    gr_vmcircbuf_createfilemapping (int size);
00040    virtual ~gr_vmcircbuf_createfilemapping ();
00041 #ifdef HAVE_CREATEFILEMAPPING
00042  private:
00043    HANDLE d_handle;
00044    LPVOID d_first_copy;
00045    LPVOID d_second_copy;
00046 #endif
00047 };
00048 
00049 /*!
00050  * \brief concrete factory for circular buffers built using mmap and shm_open
00051  */
00052 class gr_vmcircbuf_createfilemapping_factory : public gr_vmcircbuf_factory
00053 {
00054  private:
00055   static gr_vmcircbuf_factory *s_the_factory;
00056 
00057  public:
00058   static gr_vmcircbuf_factory *singleton ();
00059 
00060   virtual const char *name () const { return "gr_vmcircbuf_createfilemapping_factory"; }
00061 
00062   /*!
00063    * \brief return granularity of mapping, typically equal to page size
00064    */
00065   virtual int granularity ();
00066 
00067   /*!
00068    * \brief return a gr_vmcircbuf, or 0 if unable.
00069    *
00070    * Call this to create a doubly mapped circular buffer.
00071    */
00072   virtual gr_vmcircbuf *make (int size);
00073 };
00074 
00075 #endif /* _GR_VMCIRCBUF_CREATEFILEMAPPING_H_ */