libringbuffer/shm_types.h

   1 #ifndef _LIBRINGBUFFER_SHM_TYPES_H
   2 #define _LIBRINGBUFFER_SHM_TYPES_H
   3
   4 /*
   5  * libringbuffer/shm_types.h
   6  *
   7  * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; only
  12  * version 2.1 of the License.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include <stdint.h>
  25 #include "shm_internal.h"
  26
  27 struct channel;
  28
  29 struct shm_object {
  30         size_t index;   /* within the object table */
  31         int shm_fd;     /* shm fd */
  32         int wait_fd[2]; /* fd for wait/wakeup */
  33         char *memory_map;
  34         int is_shadow;
  35         size_t memory_map_size;
  36         uint64_t allocated_len;
  37 };
  38
  39 struct shm_object_table {
  40         size_t size;
  41         size_t allocated_len;
  42         struct shm_object objects[];
  43 };
  44
  45 struct lttng_ust_shm_handle {
  46         struct shm_object_table *table;
  47         DECLARE_SHMP(struct channel, chan);
  48         /*
  49          * In the consumer, chan points to a shadow copy, validated upon
  50          * reception. The chan object is overridden in the consumer to
  51          * point to this shadow copy.
  52          */
  53         struct channel *shadow_chan;
  54 };
  55
  56 #endif /* _LIBRINGBUFFER_SHM_TYPES_H */