libringbuffer/shm_internal.h

   1 #ifndef _LIBRINGBUFFER_SHM_INTERNAL_H
   2 #define _LIBRINGBUFFER_SHM_INTERNAL_H
   3
   4 /*
   5  * libringbuffer/shm_internal.h
   6  *
   7  * Copyright 2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * Dual LGPL v2.1/GPL v2 license.
  10  */
  11
  12 struct shm_ref {
  13         volatile ssize_t index;         /* within the object table */
  14         volatile ssize_t offset;        /* within the object */
  15 };
  16
  17 #define DECLARE_SHMP(type, name)        \
  18         union {                         \
  19                 struct shm_ref _ref;    \
  20                 type *_type;            \
  21         } name
  22
  23 #endif /* _LIBRINGBUFFER_SHM_INTERNAL_H */