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eb702af5 DG |
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 | #define _GNU_SOURCE | |
20 | #include <common/common.h> | |
21 | ||
22 | #include "index.h" | |
23 | #include "stream.h" | |
24 | #include "viewer-stream.h" | |
25 | ||
26 | static void rcu_destroy_stream(struct rcu_head *head) | |
27 | { | |
28 | struct relay_stream *stream = | |
29 | caa_container_of(head, struct relay_stream, rcu_node); | |
30 | ||
31 | free(stream->path_name); | |
32 | free(stream->channel_name); | |
33 | free(stream); | |
34 | } | |
35 | ||
36 | /* | |
37 | * Get stream from stream id from the given hash table. Return stream if found | |
38 | * else NULL. | |
39 | * | |
40 | * Need to be called with RCU read-side lock held. | |
41 | */ | |
42 | struct relay_stream *stream_find_by_id(struct lttng_ht *ht, | |
43 | uint64_t stream_id) | |
44 | { | |
45 | struct lttng_ht_node_u64 *node; | |
46 | struct lttng_ht_iter iter; | |
47 | struct relay_stream *stream = NULL; | |
48 | ||
49 | assert(ht); | |
50 | ||
51 | lttng_ht_lookup(ht, &stream_id, &iter); | |
52 | node = lttng_ht_iter_get_node_u64(&iter); | |
53 | if (node == NULL) { | |
54 | DBG("Relay stream %" PRIu64 " not found", stream_id); | |
55 | goto end; | |
56 | } | |
57 | stream = caa_container_of(node, struct relay_stream, node); | |
58 | ||
59 | end: | |
60 | return stream; | |
61 | } | |
62 | ||
63 | /* | |
64 | * Close a given stream. If an assosiated viewer stream exists it is updated. | |
65 | * | |
66 | * RCU read side lock MUST be acquired. | |
67 | * | |
68 | * Return 0 if close was successful or 1 if already closed. | |
69 | */ | |
70 | int stream_close(struct relay_session *session, struct relay_stream *stream) | |
71 | { | |
72 | int delret, ret; | |
73 | struct relay_viewer_stream *vstream; | |
74 | struct ctf_trace *ctf_trace; | |
75 | ||
76 | assert(stream); | |
77 | ||
78 | pthread_mutex_lock(&stream->lock); | |
79 | ||
80 | if (stream->terminated_flag) { | |
81 | /* This stream is already closed. Ignore. */ | |
82 | ret = 1; | |
83 | goto end_unlock; | |
84 | } | |
85 | ||
86 | DBG("Closing stream id %" PRIu64, stream->stream_handle); | |
87 | ||
88 | if (stream->fd >= 0) { | |
89 | delret = close(stream->fd); | |
90 | if (delret < 0) { | |
91 | PERROR("close stream"); | |
92 | } | |
93 | } | |
94 | ||
95 | if (stream->index_fd >= 0) { | |
96 | delret = close(stream->index_fd); | |
97 | if (delret < 0) { | |
98 | PERROR("close stream index_fd"); | |
99 | } | |
100 | } | |
101 | ||
102 | vstream = viewer_stream_find_by_id(stream->stream_handle); | |
103 | if (vstream) { | |
104 | /* | |
105 | * Set the last good value into the viewer stream. This is done | |
106 | * right before the stream gets deleted from the hash table. The | |
107 | * lookup failure on the live thread side of a stream indicates | |
108 | * that the viewer stream index received value should be used. | |
109 | */ | |
110 | pthread_mutex_lock(&stream->viewer_stream_rotation_lock); | |
111 | vstream->total_index_received = stream->total_index_received; | |
112 | vstream->tracefile_count_last = stream->tracefile_count_current; | |
113 | vstream->close_write_flag = 1; | |
114 | pthread_mutex_unlock(&stream->viewer_stream_rotation_lock); | |
115 | } | |
116 | ||
117 | /* Cleanup index of that stream. */ | |
118 | relay_index_destroy_by_stream_id(stream->stream_handle); | |
119 | ||
120 | ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, | |
121 | stream->path_name); | |
122 | assert(ctf_trace); | |
123 | ctf_trace_put_ref(ctf_trace); | |
124 | ||
11bc4a91 | 125 | stream->close_flag = 1; |
eb702af5 DG |
126 | stream->terminated_flag = 1; |
127 | ret = 0; | |
128 | ||
129 | end_unlock: | |
130 | pthread_mutex_unlock(&stream->lock); | |
131 | return ret; | |
132 | } | |
133 | ||
134 | void stream_delete(struct lttng_ht *ht, struct relay_stream *stream) | |
135 | { | |
136 | int ret; | |
137 | struct lttng_ht_iter iter; | |
138 | ||
139 | assert(ht); | |
140 | assert(stream); | |
141 | ||
142 | iter.iter.node = &stream->node.node; | |
143 | ret = lttng_ht_del(ht, &iter); | |
144 | assert(!ret); | |
145 | ||
146 | cds_list_del(&stream->trace_list); | |
147 | } | |
148 | ||
149 | void stream_destroy(struct relay_stream *stream) | |
150 | { | |
151 | assert(stream); | |
152 | ||
153 | call_rcu(&stream->rcu_node, rcu_destroy_stream); | |
154 | } |