+/*
+ * callbacks.c
+ *
+ * Babeltrace Library
+ *
+ * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
+ *
+ * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ */
+
+#include <babeltrace/babeltrace.h>
+#include <babeltrace/babeltrace-internal.h>
+#include <babeltrace/context.h>
+#include <babeltrace/context-internal.h>
+#include <babeltrace/ctf-ir/metadata.h>
+#include <babeltrace/iterator-internal.h>
+#include <babeltrace/ctf/events.h>
+#include <babeltrace/ctf/events-internal.h>
+#include <babeltrace/ctf/callbacks-internal.h>
+#include <inttypes.h>
+
+static
+struct bt_dependencies *_babeltrace_dependencies_create(const char *first,
+ va_list ap)
+{
+ const char *iter;
+ struct bt_dependencies *dep;
+
+ dep = g_new0(struct bt_dependencies, 1);
+ dep->refcount = 1;
+ dep->deps = g_array_new(FALSE, TRUE, sizeof(GQuark));
+ iter = first;
+ while (iter) {
+ GQuark q = g_quark_from_string(iter);
+ g_array_append_val(dep->deps, q);
+ iter = va_arg(ap, const char *);
+ }
+ return dep;
+}
+
+struct bt_dependencies *babeltrace_dependencies_create(const char *first, ...)
+{
+ va_list ap;
+ struct bt_dependencies *deps;
+
+ va_start(ap, first);
+ deps = _babeltrace_dependencies_create(first, ap);
+ va_end(ap);
+ return deps;
+}
+
+/*
+ * bt_ctf_iter_add_callback: Add a callback to CTF iterator.
+ */
+int bt_ctf_iter_add_callback(struct bt_ctf_iter *iter,
+ bt_intern_str event, void *private_data, int flags,
+ enum bt_cb_ret (*callback)(struct bt_ctf_event *ctf_data,
+ void *private_data),
+ struct bt_dependencies *depends,
+ struct bt_dependencies *weak_depends,
+ struct bt_dependencies *provides)
+{
+ int i, stream_id;
+ gpointer *event_id_ptr;
+ unsigned long event_id;
+ struct trace_collection *tc = iter->parent.ctx->tc;
+
+ for (i = 0; i < tc->array->len; i++) {
+ struct ctf_trace *tin;
+ struct trace_descriptor *td_read;
+
+ td_read = g_ptr_array_index(tc->array, i);
+ tin = container_of(td_read, struct ctf_trace, parent);
+
+ for (stream_id = 0; stream_id < tin->streams->len; stream_id++) {
+ struct ctf_stream_class *stream;
+ struct bt_stream_callbacks *bt_stream_cb = NULL;
+ struct bt_callback_chain *bt_chain = NULL;
+ struct bt_callback new_callback;
+
+ stream = g_ptr_array_index(tin->streams, stream_id);
+
+ if (stream_id >= iter->callbacks->len) {
+ g_array_set_size(iter->callbacks, stream->stream_id + 1);
+ }
+ bt_stream_cb = &g_array_index(iter->callbacks,
+ struct bt_stream_callbacks, stream->stream_id);
+ if (!bt_stream_cb->per_id_callbacks) {
+ bt_stream_cb->per_id_callbacks = g_array_new(FALSE, TRUE,
+ sizeof(struct bt_callback_chain));
+ }
+
+ if (event) {
+ /* find the event id */
+ event_id_ptr = g_hash_table_lookup(stream->event_quark_to_id,
+ (gconstpointer) (unsigned long) event);
+ /* event not found in this stream class */
+ if (!event_id_ptr) {
+ fprintf(stderr, "event not found\n");
+ continue;
+ }
+ event_id = (uint64_t)(unsigned long) *event_id_ptr;
+
+ /* find or create the bt_callback_chain for this event */
+ if (event_id >= bt_stream_cb->per_id_callbacks->len) {
+ g_array_set_size(bt_stream_cb->per_id_callbacks, event_id + 1);
+ }
+ bt_chain = &g_array_index(bt_stream_cb->per_id_callbacks,
+ struct bt_callback_chain, event_id);
+ if (!bt_chain->callback) {
+ bt_chain->callback = g_array_new(FALSE, TRUE,
+ sizeof(struct bt_callback));
+ }
+ } else {
+ /* callback for all events */
+ if (!iter->main_callbacks.callback) {
+ iter->main_callbacks.callback = g_array_new(FALSE, TRUE,
+ sizeof(struct bt_callback));
+ }
+ bt_chain = &iter->main_callbacks;
+ }
+
+ new_callback.private_data = private_data;
+ new_callback.flags = flags;
+ new_callback.callback = callback;
+ new_callback.depends = depends;
+ new_callback.weak_depends = weak_depends;
+ new_callback.provides = provides;
+
+ /* TODO : take care of priority, for now just FIFO */
+ g_array_append_val(bt_chain->callback, new_callback);
+ }
+ }
+
+ return 0;
+}
+
+static
+struct ctf_stream_event *extract_ctf_stream_event(struct ctf_stream *stream)
+{
+ struct ctf_stream_class *stream_class = stream->stream_class;
+ struct ctf_event *event_class;
+ struct ctf_stream_event *event;
+ uint64_t id = stream->event_id;
+
+ if (id >= stream_class->events_by_id->len) {
+ fprintf(stderr, "[error] Event id %" PRIu64 " is outside range.\n", id);
+ return NULL;
+ }
+ event = g_ptr_array_index(stream->events_by_id, id);
+ if (!event) {
+ fprintf(stderr, "[error] Event id %" PRIu64 " is unknown.\n", id);
+ return NULL;
+ }
+ event_class = g_ptr_array_index(stream_class->events_by_id, id);
+ if (!event_class) {
+ fprintf(stderr, "[error] Event id %" PRIu64 " is unknown.\n", id);
+ return NULL;
+ }
+
+ return event;
+}
+
+void process_callbacks(struct bt_ctf_iter *iter,
+ struct ctf_stream *stream)
+{
+ struct bt_stream_callbacks *bt_stream_cb;
+ struct bt_callback_chain *bt_chain;
+ struct bt_callback *cb;
+ int i;
+ enum bt_cb_ret ret;
+ struct bt_ctf_event ctf_data;
+
+ ctf_data.event = extract_ctf_stream_event(stream);
+ ctf_data.stream = stream;
+
+ /* process all events callback first */
+ if (iter->main_callbacks.callback) {
+ for (i = 0; i < iter->main_callbacks.callback->len; i++) {
+ cb = &g_array_index(iter->main_callbacks.callback, struct bt_callback, i);
+ if (!cb)
+ goto end;
+ ret = cb->callback(&ctf_data, cb->private_data);
+ switch (ret) {
+ case BT_CB_OK_STOP:
+ case BT_CB_ERROR_STOP:
+ goto end;
+ default:
+ break;
+ }
+ }
+ }
+
+ /* process per event callbacks */
+ bt_stream_cb = &g_array_index(iter->callbacks,
+ struct bt_stream_callbacks, stream->stream_id);
+ if (!bt_stream_cb || !bt_stream_cb->per_id_callbacks)
+ goto end;
+
+ if (stream->event_id >= bt_stream_cb->per_id_callbacks->len)
+ goto end;
+ bt_chain = &g_array_index(bt_stream_cb->per_id_callbacks,
+ struct bt_callback_chain, stream->event_id);
+ if (!bt_chain || !bt_chain->callback)
+ goto end;
+
+ for (i = 0; i < bt_chain->callback->len; i++) {
+ cb = &g_array_index(bt_chain->callback, struct bt_callback, i);
+ if (!cb)
+ goto end;
+ ret = cb->callback(&ctf_data, cb->private_data);
+ switch (ret) {
+ case BT_CB_OK_STOP:
+ case BT_CB_ERROR_STOP:
+ goto end;
+ default:
+ break;
+ }
+ }
+
+end:
+ return;
+}
projects / babeltrace.git / commitdiff
