Fix data pending for inflight streaming
[lttng-tools.git] / src / bin / lttng-relayd / lttng-relayd.h
1 /*
2 * Copyright (C) 2012 - 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
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as 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
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19 #ifndef LTTNG_RELAYD_H
20 #define LTTNG_RELAYD_H
21
22 #define _LGPL_SOURCE
23 #include <urcu.h>
24 #include <urcu/wfqueue.h>
25
26 /*
27 * Queue used to enqueue relay requests
28 */
29 struct relay_cmd_queue {
30 struct cds_wfq_queue queue;
31 int32_t futex;
32 };
33
34 enum connection_type {
35 RELAY_DATA,
36 RELAY_CONTROL,
37 };
38
39 /*
40 * Represents a session for the relay point of view
41 */
42 struct relay_session {
43 /*
44 * This session id is used to identify a set of stream to a tracing session
45 * but also make sure we have a unique session id associated with a session
46 * daemon which can provide multiple data source.
47 */
48 uint64_t id;
49 struct lttcomm_sock *sock;
50 };
51
52 /*
53 * Represents a stream in the relay
54 */
55 struct relay_stream {
56 uint64_t stream_handle;
57 uint64_t prev_seq; /* previous data sequence number encountered */
58 struct lttng_ht_node_ulong stream_n;
59 struct relay_session *session;
60 struct rcu_head rcu_node;
61 int fd;
62
63 /* Information telling us when to close the stream */
64 unsigned int close_flag:1;
65 uint64_t last_net_seq_num;
66 /* Indicate if the stream was initialized for a data pending command. */
67 unsigned int data_pending_check_done:1;
68 };
69
70 /*
71 * Internal structure to map a socket with the corresponding session.
72 * A hashtable indexed on the socket FD is used for the lookups.
73 */
74 struct relay_command {
75 struct lttcomm_sock *sock;
76 struct relay_session *session;
77 struct cds_wfq_node node;
78 struct lttng_ht_node_ulong sock_n;
79 struct rcu_head rcu_node;
80 enum connection_type type;
81 unsigned int version_check_done:1;
82 };
83
84 #endif /* LTTNG_RELAYD_H */
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