X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fnotification-thread.h;h=c80bb691db52263c9075a31e21f968037811f51b;hp=d223789c7abb80f2ee52bc7969e20cc153e3f86c;hb=e6887944f09a8985efb521ea638b4dfe557ff4ed;hpb=ea9a44f03f3f6e144b5f7f312eee2a5f7a849ecb diff --git a/src/bin/lttng-sessiond/notification-thread.h b/src/bin/lttng-sessiond/notification-thread.h index d223789c7..c80bb691d 100644 --- a/src/bin/lttng-sessiond/notification-thread.h +++ b/src/bin/lttng-sessiond/notification-thread.h @@ -1,32 +1,27 @@ /* - * Copyright (C) 2017 - Jérémie Galarneau + * Copyright (C) 2017 Jérémie Galarneau * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License, version 2 only, as - * published by the Free Software Foundation. + * SPDX-License-Identifier: GPL-2.0-only * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., 51 - * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef NOTIFICATION_THREAD_H #define NOTIFICATION_THREAD_H -#include -#include -#include -#include -#include +#include "action-executor.h" +#include "thread.h" #include #include +#include +#include #include #include +#include +#include +#include + + +typedef uint64_t notification_client_id; struct notification_thread_handle { /* @@ -48,10 +43,8 @@ struct notification_thread_handle { int ust64_consumer; int kernel_consumer; } channel_monitoring_pipes; - /* - * To inform the rotation thread we are ready. - */ - sem_t *notification_thread_ready; + /* Used to wait for the launch of the notification thread. */ + sem_t ready; }; /** @@ -60,9 +53,14 @@ struct notification_thread_handle { * In order to speed-up and simplify queries, hash tables providing the * following associations are maintained: * - * - client_socket_ht: associate a client's socket (fd) to its "struct client" - * This hash table owns the "struct client" which must thus be - * disposed-of on removal from the hash table. + * - client_socket_ht: associate a client's socket (fd) to its + * "struct notification_client". + * This hash table owns the "struct notification_client" which must + * thus be disposed-of on removal from the hash table. + * + * - client_id_ht: associate a client's id to its "struct notification_client" + * This hash table holds a _weak_ reference to the + * "struct notification_client". * * - channel_triggers_ht: * associates a channel key to a list of @@ -110,9 +108,14 @@ struct notification_thread_handle { * channels through their struct channel_info (ref-counting is used). * * - triggers_ht: - * associates a condition to a struct lttng_trigger_ht_element. + * associates a trigger to a struct lttng_trigger_ht_element. * The hash table holds the ownership of the * lttng_trigger_ht_elements along with the triggers themselves. + * - triggers_by_name_uid_ht: + * associates a trigger (name, uid) tuple to + * a struct lttng_trigger_ht_element. + * The hash table does not hold any ownership and is used strictly + * for lookup on registration. * * The thread reacts to the following internal events: * 1) creation of a tracing channel, @@ -120,12 +123,14 @@ struct notification_thread_handle { * 3) registration of a trigger, * 4) unregistration of a trigger, * 5) reception of a channel monitor sample from the consumer daemon. + * 6) Session rotation ongoing + * 7) Session rotation completed * * Events specific to notification-emitting triggers: - * 6) connection of a notification client, - * 7) disconnection of a notification client, - * 8) subscription of a client to a conditions' notifications, - * 9) unsubscription of a client from a conditions' notifications, + * 8) connection of a notification client, + * 9) disconnection of a notification client, + * 10) subscription of a client to a conditions' notifications, + * 11) unsubscription of a client from a conditions' notifications, * * * 1) Creation of a tracing channel @@ -154,6 +159,7 @@ struct notification_thread_handle { * notification_trigger_clients_ht, * - add trigger to channel_triggers_ht (if applicable), * - add trigger to session_triggers_ht (if applicable), + * - add trigger to triggers_by_name_uid_ht * - add trigger to triggers_ht * - evaluate the trigger's condition right away to react if that condition * is true from the beginning. @@ -163,6 +169,7 @@ struct notification_thread_handle { * - remove the trigger from the notification_trigger_clients_ht, * - remove trigger from channel_triggers_ht (if applicable), * - remove trigger from session_triggers_ht (if applicable), + * - remove trigger from triggers_by_name_uid_ht * - remove trigger from triggers_ht * * 5) Reception of a channel monitor sample from the consumer daemon @@ -172,22 +179,28 @@ struct notification_thread_handle { * "notify", query the notification_trigger_clients_ht and send * a notification to the clients. * - * 6) Connection of a client - * - add client socket to the client_socket_ht. + * 6) Session rotation ongoing * - * 7) Disconnection of a client + * 7) Session rotation completed + * + * 8) Connection of a client + * - add client socket to the client_socket_ht, + * - add client socket to the client_id_ht. + * + * 9) Disconnection of a client + * - remove client socket from the client_id_ht, * - remove client socket from the client_socket_ht, * - traverse all conditions to which the client is subscribed and remove * the client from the notification_trigger_clients_ht. * - * 8) Subscription of a client to a condition's notifications + * 10) Subscription of a client to a condition's notifications * - Add the condition to the client's list of subscribed conditions, * - Look-up notification_trigger_clients_ht and add the client to * list of clients. * - Evaluate the condition for the client that subscribed if the trigger * was already registered. * - * 9) Unsubscription of a client to a condition's notifications + * 11) Unsubscription of a client to a condition's notifications * - Remove the condition from the client's list of subscribed conditions, * - Look-up notification_trigger_clients_ht and remove the client * from the list of clients. @@ -196,6 +209,7 @@ struct notification_thread_state { int notification_channel_socket; struct lttng_poll_event events; struct cds_lfht *client_socket_ht; + struct cds_lfht *client_id_ht; struct cds_lfht *channel_triggers_ht; struct cds_lfht *session_triggers_ht; struct cds_lfht *channel_state_ht; @@ -203,17 +217,23 @@ struct notification_thread_state { struct cds_lfht *channels_ht; struct cds_lfht *sessions_ht; struct cds_lfht *triggers_ht; + struct cds_lfht *triggers_by_name_uid_ht; + struct { + uint64_t next_tracer_token; + uint64_t name_offset; + } trigger_id; + notification_client_id next_notification_client_id; + struct action_executor *executor; }; /* notification_thread_data takes ownership of the channel monitor pipes. */ struct notification_thread_handle *notification_thread_handle_create( struct lttng_pipe *ust32_channel_monitor_pipe, struct lttng_pipe *ust64_channel_monitor_pipe, - struct lttng_pipe *kernel_channel_monitor_pipe, - sem_t *notification_thread_ready); + struct lttng_pipe *kernel_channel_monitor_pipe); void notification_thread_handle_destroy( struct notification_thread_handle *handle); - -void *thread_notification(void *data); +struct lttng_thread *launch_notification_thread( + struct notification_thread_handle *handle); #endif /* NOTIFICATION_THREAD_H */