src/bin/lttng-sessiond/notification-thread.h

   1 /*
   2  * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #ifndef NOTIFICATION_THREAD_H
  19 #define NOTIFICATION_THREAD_H
  20
  21 #include <urcu/list.h>
  22 #include <urcu.h>
  23 #include <urcu/rculfhash.h>
  24 #include <lttng/trigger/trigger.h>
  25 #include <common/pipe.h>
  26 #include <common/compat/poll.h>
  27 #include <common/hashtable/hashtable.h>
  28 #include <pthread.h>
  29
  30 struct notification_thread_handle {
  31         /*
  32          * Queue of struct notification command.
  33          * event_fd must be WRITE(2) to signal that a new command
  34          * has been enqueued.
  35          */
  36         struct {
  37                 int event_fd;
  38                 struct cds_list_head list;
  39                 pthread_mutex_t lock;
  40         } cmd_queue;
  41         /*
  42          * Read side of pipes used to receive channel status info collected
  43          * by the various consumer daemons.
  44          */
  45         struct {
  46                 int ust32_consumer;
  47                 int ust64_consumer;
  48                 int kernel_consumer;
  49         } channel_monitoring_pipes;
  50 };
  51
  52 struct notification_thread_state {
  53         int notification_channel_socket;
  54         struct lttng_poll_event events;
  55         struct cds_lfht *client_socket_ht;
  56         struct cds_lfht *channel_triggers_ht;
  57         struct cds_lfht *channel_state_ht;
  58         struct cds_lfht *notification_trigger_clients_ht;
  59         struct cds_lfht *channels_ht;
  60         struct cds_lfht *triggers_ht;
  61 };
  62
  63 /* notification_thread_data takes ownership of the channel monitor pipes. */
  64 struct notification_thread_handle *notification_thread_handle_create(
  65                 struct lttng_pipe *ust32_channel_monitor_pipe,
  66                 struct lttng_pipe *ust64_channel_monitor_pipe,
  67                 struct lttng_pipe *kernel_channel_monitor_pipe);
  68 void notification_thread_handle_destroy(
  69                 struct notification_thread_handle *handle);
  70
  71 void *thread_notification(void *data);
  72
  73 #endif /* NOTIFICATION_THREAD_H */