2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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.
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
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.
23 #include <common/common.h>
24 #include <common/utils.h>
25 #include <urcu/rculist.h>
27 #include "ctf-trace.h"
28 #include "lttng-relayd.h"
31 static uint64_t last_relay_ctf_trace_id
;
32 static pthread_mutex_t last_relay_ctf_trace_id_lock
= PTHREAD_MUTEX_INITIALIZER
;
34 static void rcu_destroy_ctf_trace(struct rcu_head
*rcu_head
)
36 struct ctf_trace
*trace
=
37 caa_container_of(rcu_head
, struct ctf_trace
, rcu_node
);
43 * Destroy a ctf trace and all stream contained in it.
45 * MUST be called with the RCU read side lock.
47 static void ctf_trace_destroy(struct ctf_trace
*trace
)
50 * Getting to this point, every stream referenced by that trace
51 * have put back their ref since the've been closed by the
54 assert(cds_list_empty(&trace
->stream_list
));
55 session_put(trace
->session
);
56 trace
->session
= NULL
;
59 call_rcu(&trace
->rcu_node
, rcu_destroy_ctf_trace
);
62 static void ctf_trace_release(struct urcu_ref
*ref
)
64 struct ctf_trace
*trace
=
65 caa_container_of(ref
, struct ctf_trace
, ref
);
67 struct lttng_ht_iter iter
;
69 iter
.iter
.node
= &trace
->node
.node
;
70 ret
= lttng_ht_del(trace
->session
->ctf_traces_ht
, &iter
);
72 ctf_trace_destroy(trace
);
76 * Should be called with RCU read-side lock held.
78 bool ctf_trace_get(struct ctf_trace
*trace
)
80 return urcu_ref_get_unless_zero(&trace
->ref
);
84 * Create and return an allocated ctf_trace. NULL on error.
85 * There is no "open" and "close" for a ctf_trace, but rather just a
86 * create and refcounting. Whenever all the streams belonging to a trace
87 * put their reference, its refcount drops to 0.
89 static struct ctf_trace
*ctf_trace_create(struct relay_session
*session
,
92 struct ctf_trace
*trace
;
94 trace
= zmalloc(sizeof(*trace
));
96 PERROR("Failed to allocate ctf_trace");
99 urcu_ref_init(&trace
->ref
);
101 if (!session_get(session
)) {
102 ERR("Failed to acquire session reference");
105 trace
->session
= session
;
106 trace
->path
= strdup(subpath
);
111 CDS_INIT_LIST_HEAD(&trace
->stream_list
);
113 pthread_mutex_lock(&last_relay_ctf_trace_id_lock
);
114 trace
->id
= ++last_relay_ctf_trace_id
;
115 pthread_mutex_unlock(&last_relay_ctf_trace_id_lock
);
117 lttng_ht_node_init_str(&trace
->node
, trace
->path
);
118 trace
->session
= session
;
119 pthread_mutex_init(&trace
->lock
, NULL
);
120 pthread_mutex_init(&trace
->stream_list_lock
, NULL
);
121 lttng_ht_add_str(session
->ctf_traces_ht
, &trace
->node
);
123 DBG("Created ctf_trace %" PRIu64
"of session \"%s\" from host \"%s\" with path: %s",
124 trace
->id
, session
->session_name
, session
->hostname
,
130 ctf_trace_put(trace
);
135 * Return a ctf_trace if found by id in the given hash table else NULL.
136 * Hold a reference on the ctf_trace, and must be paired with
139 struct ctf_trace
*ctf_trace_get_by_path_or_create(struct relay_session
*session
,
142 struct lttng_ht_node_str
*node
;
143 struct lttng_ht_iter iter
;
144 struct ctf_trace
*trace
= NULL
;
147 lttng_ht_lookup(session
->ctf_traces_ht
, subpath
, &iter
);
148 node
= lttng_ht_iter_get_node_str(&iter
);
150 DBG("CTF Trace path %s not found", subpath
);
153 trace
= caa_container_of(node
, struct ctf_trace
, node
);
154 if (!ctf_trace_get(trace
)) {
161 trace
= ctf_trace_create(session
, subpath
);
166 void ctf_trace_put(struct ctf_trace
*trace
)
169 urcu_ref_put(&trace
->ref
, ctf_trace_release
);
173 int ctf_trace_close(struct ctf_trace
*trace
)
175 struct relay_stream
*stream
;
178 cds_list_for_each_entry_rcu(stream
, &trace
->stream_list
,
181 * Close stream since the connection owning the trace is being
184 try_stream_close(stream
);
188 * Since all references to the trace are held by its streams, we
189 * don't need to do any self-ref put.
194 struct relay_viewer_stream
*ctf_trace_get_viewer_metadata_stream(struct ctf_trace
*trace
)
196 struct relay_viewer_stream
*vstream
;
199 vstream
= rcu_dereference(trace
->viewer_metadata_stream
);
203 if (!viewer_stream_get(vstream
)) {