Commit | Line | Data |
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58eb9381 DG |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
7591bab1 | 4 | * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
58eb9381 DG |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License, version 2 only, as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
17 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
20 | #define _GNU_SOURCE | |
6c1c0768 | 21 | #define _LGPL_SOURCE |
58eb9381 | 22 | #include <common/common.h> |
7591bab1 | 23 | #include <urcu/rculist.h> |
58eb9381 DG |
24 | |
25 | #include "connection.h" | |
26 | #include "stream.h" | |
7591bab1 | 27 | #include "viewer-session.h" |
58eb9381 | 28 | |
7591bab1 | 29 | bool connection_get(struct relay_connection *conn) |
58eb9381 | 30 | { |
7591bab1 | 31 | bool has_ref = false; |
58eb9381 | 32 | |
7591bab1 MD |
33 | pthread_mutex_lock(&conn->reflock); |
34 | if (conn->ref.refcount != 0) { | |
35 | has_ref = true; | |
36 | urcu_ref_get(&conn->ref); | |
37 | } | |
38 | pthread_mutex_unlock(&conn->reflock); | |
39 | ||
40 | return has_ref; | |
58eb9381 DG |
41 | } |
42 | ||
7591bab1 MD |
43 | struct relay_connection *connection_get_by_sock(struct lttng_ht *relay_connections_ht, |
44 | int sock) | |
58eb9381 DG |
45 | { |
46 | struct lttng_ht_node_ulong *node; | |
47 | struct lttng_ht_iter iter; | |
48 | struct relay_connection *conn = NULL; | |
49 | ||
58eb9381 DG |
50 | assert(sock >= 0); |
51 | ||
7591bab1 MD |
52 | rcu_read_lock(); |
53 | lttng_ht_lookup(relay_connections_ht, (void *)((unsigned long) sock), | |
54 | &iter); | |
58eb9381 DG |
55 | node = lttng_ht_iter_get_node_ulong(&iter); |
56 | if (!node) { | |
57 | DBG2("Relay connection by sock %d not found", sock); | |
58 | goto end; | |
59 | } | |
60 | conn = caa_container_of(node, struct relay_connection, sock_n); | |
7591bab1 MD |
61 | if (!connection_get(conn)) { |
62 | conn = NULL; | |
63 | } | |
58eb9381 | 64 | end: |
7591bab1 | 65 | rcu_read_unlock(); |
58eb9381 DG |
66 | return conn; |
67 | } | |
68 | ||
7591bab1 MD |
69 | struct relay_connection *connection_create(struct lttcomm_sock *sock, |
70 | enum connection_type type) | |
58eb9381 | 71 | { |
7591bab1 | 72 | struct relay_connection *conn; |
58eb9381 | 73 | |
7591bab1 MD |
74 | conn = zmalloc(sizeof(*conn)); |
75 | if (!conn) { | |
76 | PERROR("zmalloc relay connection"); | |
77 | goto end; | |
78 | } | |
79 | pthread_mutex_init(&conn->reflock, NULL); | |
80 | urcu_ref_init(&conn->ref); | |
81 | conn->type = type; | |
82 | conn->sock = sock; | |
83 | lttng_ht_node_init_ulong(&conn->sock_n, (unsigned long) conn->sock->fd); | |
84 | end: | |
85 | return conn; | |
58eb9381 DG |
86 | } |
87 | ||
7591bab1 | 88 | static void rcu_free_connection(struct rcu_head *head) |
58eb9381 | 89 | { |
7591bab1 MD |
90 | struct relay_connection *conn = |
91 | caa_container_of(head, struct relay_connection, rcu_node); | |
58eb9381 | 92 | |
7591bab1 MD |
93 | lttcomm_destroy_sock(conn->sock); |
94 | if (conn->viewer_session) { | |
95 | viewer_session_destroy(conn->viewer_session); | |
96 | conn->viewer_session = NULL; | |
97 | } | |
98 | free(conn); | |
99 | } | |
100 | ||
101 | static void destroy_connection(struct relay_connection *conn) | |
102 | { | |
58eb9381 DG |
103 | call_rcu(&conn->rcu_node, rcu_free_connection); |
104 | } | |
105 | ||
7591bab1 | 106 | static void connection_release(struct urcu_ref *ref) |
58eb9381 | 107 | { |
7591bab1 MD |
108 | struct relay_connection *conn = |
109 | caa_container_of(ref, struct relay_connection, ref); | |
58eb9381 | 110 | |
7591bab1 MD |
111 | if (conn->in_socket_ht) { |
112 | struct lttng_ht_iter iter; | |
113 | int ret; | |
114 | ||
115 | iter.iter.node = &conn->sock_n.node; | |
116 | ret = lttng_ht_del(conn->socket_ht, &iter); | |
117 | assert(!ret); | |
58eb9381 DG |
118 | } |
119 | ||
7591bab1 MD |
120 | if (conn->session) { |
121 | if (session_close(conn->session)) { | |
122 | ERR("session_close"); | |
123 | } | |
124 | conn->session = NULL; | |
125 | } | |
126 | if (conn->viewer_session) { | |
127 | viewer_session_close(conn->viewer_session); | |
128 | } | |
129 | destroy_connection(conn); | |
58eb9381 DG |
130 | } |
131 | ||
7591bab1 | 132 | void connection_put(struct relay_connection *conn) |
58eb9381 | 133 | { |
7591bab1 MD |
134 | rcu_read_lock(); |
135 | pthread_mutex_lock(&conn->reflock); | |
136 | urcu_ref_put(&conn->ref, connection_release); | |
137 | pthread_mutex_unlock(&conn->reflock); | |
138 | rcu_read_unlock(); | |
58eb9381 DG |
139 | } |
140 | ||
7591bab1 MD |
141 | void connection_ht_add(struct lttng_ht *relay_connections_ht, |
142 | struct relay_connection *conn) | |
58eb9381 | 143 | { |
7591bab1 MD |
144 | assert(!conn->in_socket_ht); |
145 | lttng_ht_add_unique_ulong(relay_connections_ht, &conn->sock_n); | |
146 | conn->in_socket_ht = 1; | |
147 | conn->socket_ht = relay_connections_ht; | |
58eb9381 | 148 | } |