libringbuffer/shm_internal.h

   1 /*
   2  * SPDX-License-Identifier: LGPL-2.1-only
   3  *
   4  * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #ifndef _LIBRINGBUFFER_SHM_INTERNAL_H
   8 #define _LIBRINGBUFFER_SHM_INTERNAL_H
   9
  10 struct shm_ref {
  11         volatile ssize_t index;         /* within the object table */
  12         volatile ssize_t offset;        /* within the object */
  13 };
  14
  15 #define DECLARE_SHMP(type, name)        \
  16         union {                         \
  17                 struct shm_ref _ref;    \
  18                 type *_type;            \
  19         } name
  20
  21 #endif /* _LIBRINGBUFFER_SHM_INTERNAL_H */