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

   1 /*
   2  * Copyright (C) 2017 - Julien Desfossez <jdesfossez@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 ROTATION_THREAD_H
  19 #define ROTATION_THREAD_H
  20
  21 #include <urcu/list.h>
  22 #include <urcu.h>
  23 #include <urcu/rculfhash.h>
  24 #include <lttng/domain.h>
  25 #include <common/pipe.h>
  26 #include <common/compat/poll.h>
  27 #include <common/hashtable/hashtable.h>
  28 #include <pthread.h>
  29 #include <semaphore.h>
  30 #include "session.h"
  31
  32 /*
  33  * The timer thread enqueues struct sessiond_rotation_timer objects in the list
  34  * and wake up the rotation thread. When the rotation thread wakes up, it
  35  * empties the queue.
  36  */
  37 struct rotation_thread_timer_queue {
  38         struct lttng_pipe *event_pipe;
  39         struct cds_list_head list;
  40         pthread_mutex_t lock;
  41 };
  42
  43 struct rotation_thread_handle {
  44         /*
  45          * Read side of pipes used to communicate with the rotation thread.
  46          */
  47         /* Notification from the consumers */
  48         int ust32_consumer;
  49         int ust64_consumer;
  50         int kernel_consumer;
  51         /* quit pipe */
  52         int thread_quit_pipe;
  53
  54         struct rotation_thread_timer_queue *rotation_timer_queue;
  55
  56         /* Access to the notification thread cmd_queue */
  57         struct notification_thread_handle *notification_thread_handle;
  58
  59         sem_t *notification_thread_ready;
  60 };
  61
  62 struct rotation_thread_handle *rotation_thread_handle_create(
  63                 struct lttng_pipe *ust32_channel_rotate_pipe,
  64                 struct lttng_pipe *ust64_channel_rotate_pipe,
  65                 struct lttng_pipe *kernel_channel_rotate_pipe,
  66                 int thread_quit_pipe,
  67                 struct rotation_thread_timer_queue *rotation_timer_queue,
  68                 struct notification_thread_handle *notification_thread_handle,
  69                 sem_t *notification_thread_ready);
  70
  71 void rotation_thread_handle_destroy(
  72                 struct rotation_thread_handle *handle);
  73
  74 void *thread_rotation(void *data);
  75
  76 #endif /* ROTATION_THREAD_H */