| 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/types.h> |
| 40 | #include <babeltrace/assert-internal.h> |
| 41 | #include <babeltrace/assert-pre-internal.h> |
| 42 | #include <stdbool.h> |
| 43 | #include <inttypes.h> |
| 44 | |
| 45 | BT_ASSERT_PRE_FUNC |
| 46 | static inline bool event_class_has_trace(struct bt_event_class *event_class) |
| 47 | { |
| 48 | struct bt_stream_class *stream_class; |
| 49 | |
| 50 | stream_class = bt_event_class_borrow_stream_class(event_class); |
| 51 | BT_ASSERT(stream_class); |
| 52 | return bt_stream_class_borrow_trace(stream_class) != NULL; |
| 53 | } |
| 54 | |
| 55 | BT_HIDDEN |
| 56 | struct bt_notification *bt_notification_event_new(struct bt_graph *graph) |
| 57 | { |
| 58 | struct bt_notification_event *notification = NULL; |
| 59 | |
| 60 | notification = g_new0(struct bt_notification_event, 1); |
| 61 | if (!notification) { |
| 62 | BT_LOGE_STR("Failed to allocate one event notification."); |
| 63 | goto error; |
| 64 | } |
| 65 | |
| 66 | bt_notification_init(¬ification->parent, BT_NOTIFICATION_TYPE_EVENT, |
| 67 | (bt_object_release_func) bt_notification_event_recycle, graph); |
| 68 | goto end; |
| 69 | |
| 70 | error: |
| 71 | BT_PUT(notification); |
| 72 | |
| 73 | end: |
| 74 | return (void *) notification; |
| 75 | } |
| 76 | |
| 77 | struct bt_notification *bt_notification_event_create( |
| 78 | struct bt_graph *graph, |
| 79 | struct bt_event_class *event_class, |
| 80 | struct bt_packet *packet) |
| 81 | { |
| 82 | struct bt_notification_event *notification = NULL; |
| 83 | struct bt_event *event; |
| 84 | |
| 85 | BT_ASSERT_PRE_NON_NULL(event_class, "Event class"); |
| 86 | BT_ASSERT_PRE_NON_NULL(packet, "Packet"); |
| 87 | BT_LOGD("Creating event notification object: " |
| 88 | "event-class-addr=%p, " |
| 89 | "event-class-name=\"%s\", event-class-id=%" PRId64, |
| 90 | event_class, |
| 91 | bt_event_class_get_name(event_class), |
| 92 | bt_event_class_get_id(event_class)); |
| 93 | BT_ASSERT_PRE(event_class_has_trace(event_class), |
| 94 | "Event class is not part of a trace: %!+E", event_class); |
| 95 | event = bt_event_create(event_class, packet); |
| 96 | if (unlikely(!event)) { |
| 97 | BT_LIB_LOGE("Cannot create event from event class: " |
| 98 | "%![event-class-]+E", event_class); |
| 99 | goto error; |
| 100 | } |
| 101 | |
| 102 | /* |
| 103 | * Create notification from pool _after_ we have everything |
| 104 | * (in this case, a valid event object) so that we never have an |
| 105 | * error condition with a non-NULL notification object. |
| 106 | * Otherwise: |
| 107 | * |
| 108 | * * We cannot recycle the notification on error because |
| 109 | * bt_notification_event_recycle() expects a complete |
| 110 | * notification (and the event or clock class priority map |
| 111 | * object could be unset). |
| 112 | * |
| 113 | * * We cannot destroy the notification because we would need |
| 114 | * to notify the graph (pool owner) so that it removes the |
| 115 | * notification from its notification array. |
| 116 | */ |
| 117 | notification = (void *) bt_notification_create_from_pool( |
| 118 | &graph->event_notif_pool, graph); |
| 119 | if (unlikely(!notification)) { |
| 120 | /* bt_notification_create_from_pool() logs errors */ |
| 121 | goto error; |
| 122 | } |
| 123 | |
| 124 | BT_ASSERT(!notification->event); |
| 125 | notification->event = event; |
| 126 | BT_LOGD("Created event notification object: " |
| 127 | "event-addr=%p, event-class-addr=%p, " |
| 128 | "event-class-name=\"%s\", event-class-id=%" PRId64 ", " |
| 129 | "notif-addr=%p", |
| 130 | notification->event, event_class, |
| 131 | bt_event_class_get_name(event_class), |
| 132 | bt_event_class_get_id(event_class), |
| 133 | notification); |
| 134 | goto end; |
| 135 | |
| 136 | error: |
| 137 | BT_ASSERT(!notification); |
| 138 | bt_event_destroy(event); |
| 139 | |
| 140 | end: |
| 141 | return (void *) notification; |
| 142 | } |
| 143 | |
| 144 | BT_HIDDEN |
| 145 | void bt_notification_event_destroy(struct bt_notification *notif) |
| 146 | { |
| 147 | struct bt_notification_event *event_notif = (void *) notif; |
| 148 | |
| 149 | BT_LOGD("Destroying event notification: addr=%p", notif); |
| 150 | |
| 151 | if (event_notif->event) { |
| 152 | BT_LOGD_STR("Recycling event."); |
| 153 | bt_event_recycle(event_notif->event); |
| 154 | } |
| 155 | |
| 156 | g_free(notif); |
| 157 | } |
| 158 | |
| 159 | BT_HIDDEN |
| 160 | void bt_notification_event_recycle(struct bt_notification *notif) |
| 161 | { |
| 162 | struct bt_notification_event *event_notif = (void *) notif; |
| 163 | struct bt_graph *graph; |
| 164 | |
| 165 | BT_ASSERT(event_notif); |
| 166 | |
| 167 | if (unlikely(!notif->graph)) { |
| 168 | bt_notification_event_destroy(notif); |
| 169 | return; |
| 170 | } |
| 171 | |
| 172 | BT_LOGD("Recycling event notification: addr=%p", notif); |
| 173 | bt_notification_reset(notif); |
| 174 | BT_ASSERT(event_notif->event); |
| 175 | BT_LOGD_STR("Recycling event."); |
| 176 | bt_event_recycle(event_notif->event); |
| 177 | event_notif->event = NULL; |
| 178 | graph = notif->graph; |
| 179 | notif->graph = NULL; |
| 180 | bt_object_pool_recycle_object(&graph->event_notif_pool, notif); |
| 181 | } |
| 182 | |
| 183 | struct bt_event *bt_notification_event_borrow_event( |
| 184 | struct bt_notification *notification) |
| 185 | { |
| 186 | struct bt_notification_event *event_notification; |
| 187 | |
| 188 | BT_ASSERT_PRE_NON_NULL(notification, "Notification"); |
| 189 | BT_ASSERT_PRE_NOTIF_IS_TYPE(notification, BT_NOTIFICATION_TYPE_EVENT); |
| 190 | event_notification = container_of(notification, |
| 191 | struct bt_notification_event, parent); |
| 192 | return event_notification->event; |
| 193 | } |