| 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/context.h> |
| 25 | #include <babeltrace/ctf-ir/metadata.h> |
| 26 | #include <babeltrace/iterator-internal.h> |
| 27 | #include <inttypes.h> |
| 28 | |
| 29 | static |
| 30 | struct bt_dependencies *_babeltrace_dependencies_create(const char *first, |
| 31 | va_list ap) |
| 32 | { |
| 33 | const char *iter; |
| 34 | struct bt_dependencies *dep; |
| 35 | |
| 36 | dep = g_new0(struct bt_dependencies, 1); |
| 37 | dep->refcount = 1; |
| 38 | dep->deps = g_array_new(FALSE, TRUE, sizeof(GQuark)); |
| 39 | iter = first; |
| 40 | while (iter) { |
| 41 | GQuark q = g_quark_from_string(iter); |
| 42 | g_array_append_val(dep->deps, q); |
| 43 | iter = va_arg(ap, const char *); |
| 44 | } |
| 45 | return dep; |
| 46 | } |
| 47 | |
| 48 | struct bt_dependencies *babeltrace_dependencies_create(const char *first, ...) |
| 49 | { |
| 50 | va_list ap; |
| 51 | struct bt_dependencies *deps; |
| 52 | |
| 53 | va_start(ap, first); |
| 54 | deps = _babeltrace_dependencies_create(first, ap); |
| 55 | va_end(ap); |
| 56 | return deps; |
| 57 | } |
| 58 | |
| 59 | /* |
| 60 | * babeltrace_iter_add_callback: Add a callback to iterator. |
| 61 | */ |
| 62 | int babeltrace_iter_add_callback(struct babeltrace_iter *iter, |
| 63 | bt_event_name event, void *private_data, int flags, |
| 64 | enum bt_cb_ret (*callback)(struct bt_ctf_data *ctf_data, |
| 65 | void *private_data), |
| 66 | struct bt_dependencies *depends, |
| 67 | struct bt_dependencies *weak_depends, |
| 68 | struct bt_dependencies *provides) |
| 69 | { |
| 70 | int i, stream_id; |
| 71 | gpointer *event_id_ptr; |
| 72 | unsigned long event_id; |
| 73 | struct trace_collection *tc = iter->ctx->tc; |
| 74 | |
| 75 | for (i = 0; i < tc->array->len; i++) { |
| 76 | struct ctf_trace *tin; |
| 77 | struct trace_descriptor *td_read; |
| 78 | |
| 79 | td_read = g_ptr_array_index(tc->array, i); |
| 80 | tin = container_of(td_read, struct ctf_trace, parent); |
| 81 | |
| 82 | for (stream_id = 0; stream_id < tin->streams->len; stream_id++) { |
| 83 | struct ctf_stream_class *stream; |
| 84 | struct bt_stream_callbacks *bt_stream_cb = NULL; |
| 85 | struct bt_callback_chain *bt_chain = NULL; |
| 86 | struct bt_callback new_callback; |
| 87 | |
| 88 | stream = g_ptr_array_index(tin->streams, stream_id); |
| 89 | |
| 90 | if (stream_id >= iter->callbacks->len) { |
| 91 | g_array_set_size(iter->callbacks, stream->stream_id + 1); |
| 92 | } |
| 93 | bt_stream_cb = &g_array_index(iter->callbacks, |
| 94 | struct bt_stream_callbacks, stream->stream_id); |
| 95 | if (!bt_stream_cb->per_id_callbacks) { |
| 96 | bt_stream_cb->per_id_callbacks = g_array_new(FALSE, TRUE, |
| 97 | sizeof(struct bt_callback_chain)); |
| 98 | } |
| 99 | |
| 100 | if (event) { |
| 101 | /* find the event id */ |
| 102 | event_id_ptr = g_hash_table_lookup(stream->event_quark_to_id, |
| 103 | (gconstpointer) (unsigned long) event); |
| 104 | /* event not found in this stream class */ |
| 105 | if (!event_id_ptr) { |
| 106 | fprintf(stderr, "event not found\n"); |
| 107 | continue; |
| 108 | } |
| 109 | event_id = (uint64_t)(unsigned long) *event_id_ptr; |
| 110 | |
| 111 | /* find or create the bt_callback_chain for this event */ |
| 112 | if (event_id >= bt_stream_cb->per_id_callbacks->len) { |
| 113 | g_array_set_size(bt_stream_cb->per_id_callbacks, event_id + 1); |
| 114 | } |
| 115 | bt_chain = &g_array_index(bt_stream_cb->per_id_callbacks, |
| 116 | struct bt_callback_chain, event_id); |
| 117 | if (!bt_chain->callback) { |
| 118 | bt_chain->callback = g_array_new(FALSE, TRUE, |
| 119 | sizeof(struct bt_callback)); |
| 120 | } |
| 121 | } else { |
| 122 | /* callback for all events */ |
| 123 | if (!iter->main_callbacks.callback) { |
| 124 | iter->main_callbacks.callback = g_array_new(FALSE, TRUE, |
| 125 | sizeof(struct bt_callback)); |
| 126 | } |
| 127 | bt_chain = &iter->main_callbacks; |
| 128 | } |
| 129 | |
| 130 | new_callback.private_data = private_data; |
| 131 | new_callback.flags = flags; |
| 132 | new_callback.callback = callback; |
| 133 | new_callback.depends = depends; |
| 134 | new_callback.weak_depends = weak_depends; |
| 135 | new_callback.provides = provides; |
| 136 | |
| 137 | /* TODO : take care of priority, for now just FIFO */ |
| 138 | g_array_append_val(bt_chain->callback, new_callback); |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | return 0; |
| 143 | } |
| 144 | |
| 145 | static |
| 146 | struct ctf_stream_event *extract_ctf_stream_event(struct ctf_stream *stream) |
| 147 | { |
| 148 | struct ctf_stream_class *stream_class = stream->stream_class; |
| 149 | struct ctf_event *event_class; |
| 150 | struct ctf_stream_event *event; |
| 151 | uint64_t id = stream->event_id; |
| 152 | |
| 153 | if (id >= stream_class->events_by_id->len) { |
| 154 | fprintf(stderr, "[error] Event id %" PRIu64 " is outside range.\n", id); |
| 155 | return NULL; |
| 156 | } |
| 157 | event = g_ptr_array_index(stream->events_by_id, id); |
| 158 | if (!event) { |
| 159 | fprintf(stderr, "[error] Event id %" PRIu64 " is unknown.\n", id); |
| 160 | return NULL; |
| 161 | } |
| 162 | event_class = g_ptr_array_index(stream_class->events_by_id, id); |
| 163 | if (!event_class) { |
| 164 | fprintf(stderr, "[error] Event id %" PRIu64 " is unknown.\n", id); |
| 165 | return NULL; |
| 166 | } |
| 167 | |
| 168 | return event; |
| 169 | } |
| 170 | |
| 171 | void process_callbacks(struct babeltrace_iter *iter, |
| 172 | struct ctf_stream *stream) |
| 173 | { |
| 174 | struct bt_stream_callbacks *bt_stream_cb; |
| 175 | struct bt_callback_chain *bt_chain; |
| 176 | struct bt_callback *cb; |
| 177 | int i; |
| 178 | enum bt_cb_ret ret; |
| 179 | struct bt_ctf_data ctf_data; |
| 180 | |
| 181 | ctf_data.event = extract_ctf_stream_event(stream); |
| 182 | ctf_data.stream = stream; |
| 183 | |
| 184 | /* process all events callback first */ |
| 185 | if (iter->main_callbacks.callback) { |
| 186 | for (i = 0; i < iter->main_callbacks.callback->len; i++) { |
| 187 | cb = &g_array_index(iter->main_callbacks.callback, struct bt_callback, i); |
| 188 | if (!cb) |
| 189 | goto end; |
| 190 | ret = cb->callback(&ctf_data, cb->private_data); |
| 191 | switch (ret) { |
| 192 | case BT_CB_OK_STOP: |
| 193 | case BT_CB_ERROR_STOP: |
| 194 | goto end; |
| 195 | default: |
| 196 | break; |
| 197 | } |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | /* process per event callbacks */ |
| 202 | bt_stream_cb = &g_array_index(iter->callbacks, |
| 203 | struct bt_stream_callbacks, stream->stream_id); |
| 204 | if (!bt_stream_cb || !bt_stream_cb->per_id_callbacks) |
| 205 | goto end; |
| 206 | |
| 207 | if (stream->event_id > bt_stream_cb->per_id_callbacks->len) |
| 208 | goto end; |
| 209 | bt_chain = &g_array_index(bt_stream_cb->per_id_callbacks, |
| 210 | struct bt_callback_chain, stream->event_id); |
| 211 | if (!bt_chain || !bt_chain->callback) |
| 212 | goto end; |
| 213 | |
| 214 | for (i = 0; i < bt_chain->callback->len; i++) { |
| 215 | cb = &g_array_index(bt_chain->callback, struct bt_callback, i); |
| 216 | if (!cb) |
| 217 | goto end; |
| 218 | ret = cb->callback(&ctf_data, cb->private_data); |
| 219 | switch (ret) { |
| 220 | case BT_CB_OK_STOP: |
| 221 | case BT_CB_ERROR_STOP: |
| 222 | goto end; |
| 223 | default: |
| 224 | break; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | end: |
| 229 | return; |
| 230 | } |