API Fix: bt_ctf_iter_read_event_flags
[babeltrace.git] / formats / ctf / iterator.c
1 /*
2 * ctf/iterator.c
3 *
4 * Babeltrace Library
5 *
6 * Copyright 2011-2012 EfficiOS Inc. and Linux Foundation
7 *
8 * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 * Julien Desfossez <julien.desfossez@efficios.com>
10 *
11 * Permission is hereby granted, free of charge, to any person obtaining a copy
12 * of this software and associated documentation files (the "Software"), to deal
13 * in the Software without restriction, including without limitation the rights
14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15 * copies of the Software, and to permit persons to whom the Software is
16 * furnished to do so, subject to the following conditions:
17 *
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
20 */
21
22 #include <babeltrace/babeltrace.h>
23 #include <babeltrace/format.h>
24 #include <babeltrace/ctf/events.h>
25 #include <babeltrace/ctf-ir/metadata.h>
26 #include <babeltrace/prio_heap.h>
27 #include <babeltrace/iterator-internal.h>
28 #include <babeltrace/ctf/events-internal.h>
29 #include <babeltrace/ctf/metadata.h>
30 #include <glib.h>
31
32 #include "events-private.h"
33
34 struct bt_ctf_iter *bt_ctf_iter_create(struct bt_context *ctx,
35 const struct bt_iter_pos *begin_pos,
36 const struct bt_iter_pos *end_pos)
37 {
38 struct bt_ctf_iter *iter;
39 int ret;
40
41 if (!ctx)
42 return NULL;
43
44 iter = g_new0(struct bt_ctf_iter, 1);
45 ret = bt_iter_init(&iter->parent, ctx, begin_pos, end_pos);
46 if (ret) {
47 g_free(iter);
48 return NULL;
49 }
50 iter->callbacks = g_array_new(0, 1, sizeof(struct bt_stream_callbacks));
51 iter->recalculate_dep_graph = 0;
52 iter->main_callbacks.callback = NULL;
53 iter->dep_gc = g_ptr_array_new();
54 return iter;
55 }
56
57 void bt_ctf_iter_destroy(struct bt_ctf_iter *iter)
58 {
59 struct bt_stream_callbacks *bt_stream_cb;
60 struct bt_callback_chain *bt_chain;
61 int i, j;
62
63 assert(iter);
64
65 /* free all events callbacks */
66 if (iter->main_callbacks.callback)
67 g_array_free(iter->main_callbacks.callback, TRUE);
68
69 /* free per-event callbacks */
70 for (i = 0; i < iter->callbacks->len; i++) {
71 bt_stream_cb = &g_array_index(iter->callbacks,
72 struct bt_stream_callbacks, i);
73 if (!bt_stream_cb || !bt_stream_cb->per_id_callbacks)
74 continue;
75 for (j = 0; j < bt_stream_cb->per_id_callbacks->len; j++) {
76 bt_chain = &g_array_index(bt_stream_cb->per_id_callbacks,
77 struct bt_callback_chain, j);
78 if (bt_chain->callback) {
79 g_array_free(bt_chain->callback, TRUE);
80 }
81 }
82 g_array_free(bt_stream_cb->per_id_callbacks, TRUE);
83 }
84
85 bt_iter_fini(&iter->parent);
86 g_free(iter);
87 }
88
89 struct bt_iter *bt_ctf_get_iter(struct bt_ctf_iter *iter)
90 {
91 if (!iter)
92 return NULL;
93
94 return &iter->parent;
95 }
96
97 struct bt_ctf_event *bt_ctf_iter_read_event_flags(struct bt_ctf_iter *iter,
98 int *flags)
99 {
100 struct ctf_file_stream *file_stream;
101 struct bt_ctf_event *ret;
102 struct ctf_stream_definition *stream;
103 struct packet_index *packet_index;
104
105 /*
106 * We do not want to fail for any other reason than end of
107 * trace, hence the assert.
108 */
109 assert(iter);
110
111 ret = &iter->current_ctf_event;
112 file_stream = heap_maximum(iter->parent.stream_heap);
113 if (!file_stream) {
114 /* end of file for all streams */
115 goto stop;
116 }
117 stream = &file_stream->parent;
118 ret->parent = g_ptr_array_index(stream->events_by_id,
119 stream->event_id);
120
121 if (flags)
122 *flags = 0;
123 if (!file_stream->pos.packet_cycles_index)
124 packet_index = NULL;
125 else
126 packet_index = &g_array_index(file_stream->pos.packet_cycles_index,
127 struct packet_index, file_stream->pos.cur_index);
128 iter->events_lost = 0;
129 if (packet_index && packet_index->events_discarded >
130 file_stream->pos.last_events_discarded) {
131 if (flags)
132 *flags |= BT_ITER_FLAG_LOST_EVENTS;
133 iter->events_lost += packet_index->events_discarded -
134 file_stream->pos.last_events_discarded;
135 file_stream->pos.last_events_discarded =
136 packet_index->events_discarded;
137 }
138
139 if (ret->parent->stream->stream_id > iter->callbacks->len)
140 goto end;
141
142 process_callbacks(iter, ret->parent->stream);
143
144 end:
145 return ret;
146 stop:
147 return NULL;
148 }
149
150 struct bt_ctf_event *bt_ctf_iter_read_event(struct bt_ctf_iter *iter)
151 {
152 return bt_ctf_iter_read_event_flags(iter, NULL);
153 }
154
155 uint64_t bt_ctf_get_lost_events_count(struct bt_ctf_iter *iter)
156 {
157 if (!iter)
158 return -1ULL;
159
160 return iter->events_lost;
161 }
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