GNU Radio 3.6.4.1 C++ API
gr_vmcircbuf_createfilemapping.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2003,2005 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
6  *
7  * GNU Radio is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 3, or (at your option)
10  * any later version.
11  *
12  * GNU Radio is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with GNU Radio; see the file COPYING. If not, write to
19  * the Free Software Foundation, Inc., 51 Franklin Street,
20  * Boston, MA 02110-1301, USA.
21  */
22 
23 #ifndef _GR_VMCIRCBUF_CREATEFILEMAPPING_H_
24 #define _GR_VMCIRCBUF_CREATEFILEMAPPING_H_
25 
26 #include <gr_core_api.h>
27 #include <gr_vmcircbuf.h>
28 
29 #ifdef HAVE_CREATEFILEMAPPING
30 #include <windows.h>
31 #endif
32 /*!
33  * \brief concrete class to implement circular buffers with mmap and shm_open
34  * \ingroup internal
35  */
37 {
38  public:
39  // CREATORS
42 #ifdef HAVE_CREATEFILEMAPPING
43  private:
44  HANDLE d_handle;
45  LPVOID d_first_copy;
46  LPVOID d_second_copy;
47 #endif
48 };
49 
50 /*!
51  * \brief concrete factory for circular buffers built using mmap and shm_open
52  */
54 {
55  private:
56  static gr_vmcircbuf_factory *s_the_factory;
57 
58  public:
59  static gr_vmcircbuf_factory *singleton ();
60 
61  virtual const char *name () const { return "gr_vmcircbuf_createfilemapping_factory"; }
62 
63  /*!
64  * \brief return granularity of mapping, typically equal to page size
65  */
66  virtual int granularity ();
67 
68  /*!
69  * \brief return a gr_vmcircbuf, or 0 if unable.
70  *
71  * Call this to create a doubly mapped circular buffer.
72  */
73  virtual gr_vmcircbuf *make (int size);
74 };
75 
76 #endif /* _GR_VMCIRCBUF_CREATEFILEMAPPING_H_ */