src/bin/lttng-relayd/lttng-relayd.h

   1 #ifndef LTTNG_RELAYD_H
   2 #define LTTNG_RELAYD_H
   3
   4 /*
   5  * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
   6  *                      David Goulet <dgoulet@efficios.com>
   7  *               2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, version 2 only,
  11  * as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  * more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22
  23 #include <limits.h>
  24 #include <urcu.h>
  25 #include <urcu/wfcqueue.h>
  26
  27 #include <common/hashtable/hashtable.h>
  28 #include <common/fd-tracker/fd-tracker.h>
  29
  30 struct sessiond_trace_chunk_registry;
  31
  32 /*
  33  * Queue used to enqueue relay requests
  34  */
  35 struct relay_conn_queue {
  36         struct cds_wfcq_head head;
  37         struct cds_wfcq_tail tail;
  38         int32_t futex;
  39 };
  40
  41 enum relay_group_output_by {
  42         RELAYD_GROUP_OUTPUT_BY_UNKNOWN,
  43         RELAYD_GROUP_OUTPUT_BY_HOST,
  44         RELAYD_GROUP_OUTPUT_BY_SESSION,
  45 };
  46
  47 /*
  48  * Contains stream indexed by ID. This is important since many commands lookup
  49  * streams only by ID thus also keeping them in this hash table makes the
  50  * search O(1).
  51  */
  52 extern struct lttng_ht *sessions_ht;
  53 extern struct lttng_ht *relay_streams_ht;
  54 extern struct lttng_ht *viewer_streams_ht;
  55 extern struct sessiond_trace_chunk_registry *sessiond_trace_chunk_registry;
  56
  57 extern char *opt_output_path;
  58 extern const char *tracing_group_name;
  59 extern const char * const config_section_name;
  60 extern enum relay_group_output_by opt_group_output_by;
  61
  62 extern int thread_quit_pipe[2];
  63
  64 extern struct fd_tracker *the_fd_tracker;
  65
  66 void lttng_relay_notify_ready(void);
  67 int lttng_relay_stop_threads(void);
  68
  69 #endif /* LTTNG_RELAYD_H */