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 2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * Dual LGPL v2.1/GPL v2 license.
  10  */
  11
  12 #include <stdint.h>
  13 #include "shm_internal.h"
  14
  15 struct channel;
  16
  17 struct shm_object {
  18         size_t index;   /* within the object table */
  19         int shm_fd;     /* shm fd */
  20         int wait_fd[2]; /* fd for wait/wakeup */
  21         char *memory_map;
  22         int is_shadow;
  23         uint64_t memory_map_size;
  24         size_t allocated_len;
  25 };
  26
  27 struct shm_object_table {
  28         size_t size;
  29         size_t allocated_len;
  30         struct shm_object objects[];
  31 };
  32
  33 struct lttng_ust_shm_handle {
  34         struct shm_object_table *table;
  35         DECLARE_SHMP(struct channel, chan);
  36         /*
  37          * In the consumer, chan points to a shadow copy, validated upon
  38          * reception. The chan object is overridden in the consumer to
  39          * point to this shadow copy.
  40          */
  41         struct channel *shadow_chan;
  42 };
  43
  44 #endif /* _LIBRINGBUFFER_SHM_TYPES_H */