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1 | /* |
2 | * callbacks.c | |
3 | * | |
4 | * Babeltrace Library | |
5 | * | |
6 | * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation | |
7 | * | |
8 | * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
9 | * | |
10 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
11 | * of this software and associated documentation files (the "Software"), to deal | |
12 | * in the Software without restriction, including without limitation the rights | |
13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
14 | * copies of the Software, and to permit persons to whom the Software is | |
15 | * furnished to do so, subject to the following conditions: | |
16 | * | |
17 | * The above copyright notice and this permission notice shall be included in | |
18 | * all copies or substantial portions of the Software. | |
19 | */ | |
20 | ||
21 | #include <babeltrace/babeltrace.h> | |
22 | #include <babeltrace/babeltrace-internal.h> | |
23 | #include <babeltrace/callbacks-internal.h> | |
24 | #include <babeltrace/ctf-ir/metadata.h> | |
25 | #include <babeltrace/iterator-internal.h> | |
26 | #include <inttypes.h> | |
27 | ||
28 | static | |
29 | struct bt_dependencies *_babeltrace_dependencies_create(const char *first, | |
30 | va_list ap) | |
31 | { | |
32 | const char *iter; | |
33 | struct bt_dependencies *dep; | |
34 | ||
35 | dep = g_new0(struct bt_dependencies, 1); | |
36 | dep->refcount = 1; | |
37 | dep->deps = g_array_new(FALSE, TRUE, sizeof(GQuark)); | |
38 | iter = first; | |
39 | while (iter) { | |
40 | GQuark q = g_quark_from_string(iter); | |
41 | g_array_append_val(dep->deps, q); | |
42 | iter = va_arg(ap, const char *); | |
43 | } | |
44 | return dep; | |
45 | } | |
46 | ||
47 | struct bt_dependencies *babeltrace_dependencies_create(const char *first, ...) | |
48 | { | |
49 | va_list ap; | |
50 | struct bt_dependencies *deps; | |
51 | ||
52 | va_start(ap, first); | |
53 | deps = _babeltrace_dependencies_create(first, ap); | |
54 | va_end(ap); | |
55 | return deps; | |
56 | } | |
57 | ||
58 | /* | |
59 | * babeltrace_iter_add_callback: Add a callback to iterator. | |
60 | */ | |
61 | int babeltrace_iter_add_callback(struct babeltrace_iter *iter, | |
62 | bt_event_name event, void *private_data, int flags, | |
63 | enum bt_cb_ret (*callback)(struct bt_ctf_data *ctf_data, | |
64 | void *private_data), | |
65 | struct bt_dependencies *depends, | |
66 | struct bt_dependencies *weak_depends, | |
67 | struct bt_dependencies *provides) | |
68 | { | |
69 | int i, stream_id; | |
70 | gpointer *event_id_ptr; | |
71 | unsigned long event_id; | |
72 | struct trace_collection *tc = iter->tc; | |
73 | ||
74 | for (i = 0; i < tc->array->len; i++) { | |
75 | struct ctf_trace *tin; | |
76 | struct trace_descriptor *td_read; | |
77 | ||
78 | td_read = g_ptr_array_index(tc->array, i); | |
79 | tin = container_of(td_read, struct ctf_trace, parent); | |
80 | ||
81 | for (stream_id = 0; stream_id < tin->streams->len; stream_id++) { | |
82 | struct ctf_stream_class *stream; | |
83 | struct bt_stream_callbacks *bt_stream_cb = NULL; | |
84 | struct bt_callback_chain *bt_chain = NULL; | |
85 | struct bt_callback new_callback; | |
86 | ||
87 | stream = g_ptr_array_index(tin->streams, stream_id); | |
88 | ||
89 | if (stream_id >= iter->callbacks->len) { | |
90 | g_array_set_size(iter->callbacks, stream->stream_id + 1); | |
91 | } | |
92 | bt_stream_cb = &g_array_index(iter->callbacks, | |
93 | struct bt_stream_callbacks, stream->stream_id); | |
94 | if (!bt_stream_cb->per_id_callbacks) { | |
95 | bt_stream_cb->per_id_callbacks = g_array_new(FALSE, TRUE, | |
96 | sizeof(struct bt_callback_chain)); | |
97 | } | |
98 | ||
99 | if (event) { | |
100 | /* find the event id */ | |
101 | event_id_ptr = g_hash_table_lookup(stream->event_quark_to_id, | |
102 | (gconstpointer) (unsigned long) event); | |
103 | /* event not found in this stream class */ | |
104 | if (!event_id_ptr) { | |
105 | printf("event not found\n"); | |
106 | continue; | |
107 | } | |
108 | event_id = (uint64_t)(unsigned long) *event_id_ptr; | |
109 | ||
110 | /* find or create the bt_callback_chain for this event */ | |
111 | if (event_id >= bt_stream_cb->per_id_callbacks->len) { | |
112 | g_array_set_size(bt_stream_cb->per_id_callbacks, event_id + 1); | |
113 | } | |
114 | bt_chain = &g_array_index(bt_stream_cb->per_id_callbacks, | |
115 | struct bt_callback_chain, event_id); | |
116 | if (!bt_chain->callback) { | |
117 | bt_chain->callback = g_array_new(FALSE, TRUE, | |
118 | sizeof(struct bt_callback)); | |
119 | } | |
120 | } else { | |
121 | /* callback for all events */ | |
122 | if (!iter->main_callbacks.callback) { | |
123 | iter->main_callbacks.callback = g_array_new(FALSE, TRUE, | |
124 | sizeof(struct bt_callback)); | |
125 | } | |
126 | bt_chain = &iter->main_callbacks; | |
127 | } | |
128 | ||
129 | new_callback.private_data = private_data; | |
130 | new_callback.flags = flags; | |
131 | new_callback.callback = callback; | |
132 | new_callback.depends = depends; | |
133 | new_callback.weak_depends = weak_depends; | |
134 | new_callback.provides = provides; | |
135 | ||
136 | /* TODO : take care of priority, for now just FIFO */ | |
137 | g_array_append_val(bt_chain->callback, new_callback); | |
138 | } | |
139 | } | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static | |
145 | struct ctf_stream_event *extract_ctf_stream_event(struct ctf_stream *stream) | |
146 | { | |
147 | struct ctf_stream_class *stream_class = stream->stream_class; | |
148 | struct ctf_event *event_class; | |
149 | struct ctf_stream_event *event; | |
150 | uint64_t id = stream->event_id; | |
151 | ||
152 | if (id >= stream_class->events_by_id->len) { | |
153 | fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id); | |
154 | return NULL; | |
155 | } | |
156 | event = g_ptr_array_index(stream->events_by_id, id); | |
157 | if (!event) { | |
158 | fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id); | |
159 | return NULL; | |
160 | } | |
161 | event_class = g_ptr_array_index(stream_class->events_by_id, id); | |
162 | if (!event_class) { | |
163 | fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id); | |
164 | return NULL; | |
165 | } | |
166 | ||
167 | return event; | |
168 | } | |
169 | ||
170 | void process_callbacks(struct babeltrace_iter *iter, | |
171 | struct ctf_stream *stream) | |
172 | { | |
173 | struct bt_stream_callbacks *bt_stream_cb; | |
174 | struct bt_callback_chain *bt_chain; | |
175 | struct bt_callback *cb; | |
176 | int i; | |
177 | enum bt_cb_ret ret; | |
178 | struct bt_ctf_data ctf_data; | |
179 | ||
180 | ctf_data.event = extract_ctf_stream_event(stream); | |
181 | ctf_data.stream = stream; | |
182 | ||
183 | /* process all events callback first */ | |
184 | if (iter->main_callbacks.callback) { | |
185 | for (i = 0; i < iter->main_callbacks.callback->len; i++) { | |
186 | cb = &g_array_index(iter->main_callbacks.callback, struct bt_callback, i); | |
187 | if (!cb) | |
188 | goto end; | |
189 | ret = cb->callback(&ctf_data, cb->private_data); | |
190 | switch (ret) { | |
191 | case BT_CB_OK_STOP: | |
192 | case BT_CB_ERROR_STOP: | |
193 | goto end; | |
194 | default: | |
195 | break; | |
196 | } | |
197 | } | |
198 | } | |
199 | ||
200 | /* process per event callbacks */ | |
201 | bt_stream_cb = &g_array_index(iter->callbacks, | |
202 | struct bt_stream_callbacks, stream->stream_id); | |
203 | if (!bt_stream_cb || !bt_stream_cb->per_id_callbacks) | |
204 | goto end; | |
205 | ||
206 | if (stream->event_id > bt_stream_cb->per_id_callbacks->len) | |
207 | goto end; | |
208 | bt_chain = &g_array_index(bt_stream_cb->per_id_callbacks, | |
209 | struct bt_callback_chain, stream->event_id); | |
210 | if (!bt_chain || !bt_chain->callback) | |
211 | goto end; | |
212 | ||
213 | for (i = 0; i < bt_chain->callback->len; i++) { | |
214 | cb = &g_array_index(bt_chain->callback, struct bt_callback, i); | |
215 | if (!cb) | |
216 | goto end; | |
217 | ret = cb->callback(&ctf_data, cb->private_data); | |
218 | switch (ret) { | |
219 | case BT_CB_OK_STOP: | |
220 | case BT_CB_ERROR_STOP: | |
221 | goto end; | |
222 | default: | |
223 | break; | |
224 | } | |
225 | } | |
226 | ||
227 | end: | |
228 | return; | |
229 | } |