src/bin/lttng-relayd/index.h

   1 /*
   2  * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
   3  *                      David Goulet <dgoulet@efficios.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License, version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 51
  16  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #ifndef _RELAY_INDEX_H
  20 #define _RELAY_INDEX_H
  21
  22 #include <inttypes.h>
  23 #include <pthread.h>
  24
  25 #include <common/hashtable/hashtable.h>
  26 #include <common/index/index.h>
  27
  28 struct relay_index {
  29         /* FD on which to write the index data. */
  30         int fd;
  31         /*
  32          * When destroying this object, this fd is checked and if valid, close it
  33          * so this is basically a lazy close of the previous fd corresponding to
  34          * the same stream id. This is used for the rotate file feature.
  35          */
  36         int to_close_fd;
  37
  38         /* Index packet data. This is the data that is written on disk. */
  39         struct ctf_packet_index index_data;
  40
  41         /* key1 = stream_id, key2 = net_seq_num */
  42         struct lttng_ht_node_two_u64 index_n;
  43         struct rcu_head rcu_node;
  44         pthread_mutex_t mutex;
  45 };
  46
  47 struct relay_index *relay_index_create(uint64_t stream_id,
  48                 uint64_t net_seq_num);
  49 struct relay_index *relay_index_find(uint64_t stream_id, uint64_t net_seq_num);
  50 void relay_index_add(struct relay_index *index, struct relay_index **_index);
  51 int relay_index_write(int fd, struct relay_index *index);
  52 void relay_index_free(struct relay_index *index);
  53 void relay_index_free_safe(struct relay_index *index);
  54 void relay_index_delete(struct relay_index *index);
  55 void relay_index_destroy_by_stream_id(uint64_t stream_id);
  56
  57 #endif /* _RELAY_INDEX_H */