lib/graph/notification/event.c

   1 /*
   2  * Babeltrace Plug-in Event Notification
   3  *
   4  * Copyright 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   5  *
   6  * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24  * SOFTWARE.
  25  */
  26
  27 #define BT_LOG_TAG "NOTIF-EVENT"
  28 #include <babeltrace/lib-logging-internal.h>
  29
  30 #include <babeltrace/compiler-internal.h>
  31 #include <babeltrace/object-internal.h>
  32 #include <babeltrace/ctf-ir/event.h>
  33 #include <babeltrace/ctf-ir/event-internal.h>
  34 #include <babeltrace/ctf-ir/event-class-internal.h>
  35 #include <babeltrace/ctf-ir/stream-class-internal.h>
  36 #include <babeltrace/ctf-ir/trace.h>
  37 #include <babeltrace/graph/graph-internal.h>
  38 #include <babeltrace/graph/notification-event-internal.h>
  39 #include <babeltrace/graph/private-connection-private-notification-iterator.h>
  40 #include <babeltrace/types.h>
  41 #include <babeltrace/assert-internal.h>
  42 #include <babeltrace/assert-pre-internal.h>
  43 #include <stdbool.h>
  44 #include <inttypes.h>
  45
  46 BT_ASSERT_PRE_FUNC
  47 static inline bool event_class_has_trace(struct bt_event_class *event_class)
  48 {
  49         struct bt_stream_class *stream_class;
  50
  51         stream_class = bt_event_class_borrow_stream_class(event_class);
  52         BT_ASSERT(stream_class);
  53         return bt_stream_class_borrow_trace(stream_class) != NULL;
  54 }
  55
  56 BT_HIDDEN
  57 struct bt_notification *bt_notification_event_new(
  58                 struct bt_graph *graph)
  59 {
  60         struct bt_notification_event *notification = NULL;
  61
  62         notification = g_new0(struct bt_notification_event, 1);
  63         if (!notification) {
  64                 BT_LOGE_STR("Failed to allocate one event notification.");
  65                 goto error;
  66         }
  67
  68         bt_notification_init(&notification->parent, BT_NOTIFICATION_TYPE_EVENT,
  69                 (bt_object_release_func) bt_notification_event_recycle, graph);
  70         goto end;
  71
  72 error:
  73         BT_PUT(notification);
  74
  75 end:
  76         return (void *) notification;
  77 }
  78
  79 struct bt_notification *bt_notification_event_create(
  80                 struct bt_private_connection_private_notification_iterator *notif_iter,
  81                 struct bt_event_class *event_class,
  82                 struct bt_packet *packet)
  83 {
  84         struct bt_notification_event *notification = NULL;
  85         struct bt_event *event;
  86         struct bt_graph *graph;
  87
  88         BT_ASSERT_PRE_NON_NULL(notif_iter, "Notification iterator");
  89         BT_ASSERT_PRE_NON_NULL(event_class, "Event class");
  90         BT_ASSERT_PRE_NON_NULL(packet, "Packet");
  91         BT_LOGD("Creating event notification object: "
  92                 "event-class-addr=%p, "
  93                 "event-class-name=\"%s\", event-class-id=%" PRId64,
  94                 event_class,
  95                 bt_event_class_get_name(event_class),
  96                 bt_event_class_get_id(event_class));
  97         BT_ASSERT_PRE(event_class_has_trace(event_class),
  98                 "Event class is not part of a trace: %!+E", event_class);
  99         event = bt_event_create(event_class, packet);
 100         if (unlikely(!event)) {
 101                 BT_LIB_LOGE("Cannot create event from event class: "
 102                         "%![event-class-]+E", event_class);
 103                 goto error;
 104         }
 105
 106         /*
 107          * Create notification from pool _after_ we have everything
 108          * (in this case, a valid event object) so that we never have an
 109          * error condition with a non-NULL notification object.
 110          * Otherwise:
 111          *
 112          * * We cannot recycle the notification on error because
 113          *   bt_notification_event_recycle() expects a complete
 114          *   notification (and the event or clock class priority map
 115          *   object could be unset).
 116          *
 117          * * We cannot destroy the notification because we would need
 118          *   to notify the graph (pool owner) so that it removes the
 119          *   notification from its notification array.
 120          */
 121         graph = bt_private_connection_private_notification_iterator_borrow_graph(
 122                 notif_iter);
 123         notification = (void *) bt_notification_create_from_pool(
 124                 &graph->event_notif_pool, graph);
 125         if (unlikely(!notification)) {
 126                 /* bt_notification_create_from_pool() logs errors */
 127                 goto error;
 128         }
 129
 130         BT_ASSERT(!notification->event);
 131         notification->event = event;
 132         bt_packet_set_is_frozen(packet, true);
 133         bt_event_class_freeze(event_class);
 134         BT_LOGD("Created event notification object: "
 135                 "event-addr=%p, event-class-addr=%p, "
 136                 "event-class-name=\"%s\", event-class-id=%" PRId64 ", "
 137                 "notif-addr=%p",
 138                 notification->event, event_class,
 139                 bt_event_class_get_name(event_class),
 140                 bt_event_class_get_id(event_class),
 141                 notification);
 142         goto end;
 143
 144 error:
 145         BT_ASSERT(!notification);
 146         bt_event_destroy(event);
 147
 148 end:
 149         return (void *) notification;
 150 }
 151
 152 BT_HIDDEN
 153 void bt_notification_event_destroy(struct bt_notification *notif)
 154 {
 155         struct bt_notification_event *event_notif = (void *) notif;
 156
 157         BT_LOGD("Destroying event notification: addr=%p", notif);
 158
 159         if (event_notif->event) {
 160                 BT_LOGD_STR("Recycling event.");
 161                 bt_event_recycle(event_notif->event);
 162         }
 163
 164         g_free(notif);
 165 }
 166
 167 BT_HIDDEN
 168 void bt_notification_event_recycle(struct bt_notification *notif)
 169 {
 170         struct bt_notification_event *event_notif = (void *) notif;
 171         struct bt_graph *graph;
 172
 173         BT_ASSERT(event_notif);
 174
 175         if (unlikely(!notif->graph)) {
 176                 bt_notification_event_destroy(notif);
 177                 return;
 178         }
 179
 180         BT_LOGD("Recycling event notification: addr=%p", notif);
 181         bt_notification_reset(notif);
 182         BT_ASSERT(event_notif->event);
 183         BT_LOGD_STR("Recycling event.");
 184         bt_event_recycle(event_notif->event);
 185         event_notif->event = NULL;
 186         graph = notif->graph;
 187         notif->graph = NULL;
 188         bt_object_pool_recycle_object(&graph->event_notif_pool, notif);
 189 }
 190
 191 struct bt_event *bt_notification_event_borrow_event(
 192                 struct bt_notification *notification)
 193 {
 194         struct bt_notification_event *event_notification;
 195
 196         BT_ASSERT_PRE_NON_NULL(notification, "Notification");
 197         BT_ASSERT_PRE_NOTIF_IS_TYPE(notification, BT_NOTIFICATION_TYPE_EVENT);
 198         event_notification = container_of(notification,
 199                         struct bt_notification_event, parent);
 200         return event_notification->event;
 201 }