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 "session.h"
  30
  31 /*
  32  * The timer thread enqueues struct sessiond_rotation_timer objects in the list
  33  * and wake up the rotation thread. When the rotation thread wakes up, it
  34  * empties the queue.
  35  */
  36 struct rotation_thread_timer_queue {
  37         struct lttng_pipe *event_pipe;
  38         struct cds_list_head list;
  39         pthread_mutex_t lock;
  40 };
  41
  42 struct rotation_thread_handle {
  43         /*
  44          * Read side of pipes used to communicate with the rotation thread.
  45          */
  46         /* Notification from the consumers */
  47         int ust32_consumer;
  48         int ust64_consumer;
  49         int kernel_consumer;
  50         /* quit pipe */
  51         int thread_quit_pipe;
  52         struct rotation_thread_timer_queue *rotation_timer_queue;
  53 };
  54
  55 struct rotation_thread_handle *rotation_thread_handle_create(
  56                 struct lttng_pipe *ust32_channel_rotate_pipe,
  57                 struct lttng_pipe *ust64_channel_rotate_pipe,
  58                 struct lttng_pipe *kernel_channel_rotate_pipe,
  59                 int thread_quit_pipe,
  60                 struct rotation_thread_timer_queue *rotation_timer_queue);
  61
  62 void rotation_thread_handle_destroy(
  63                 struct rotation_thread_handle *handle);
  64
  65 void *thread_rotation(void *data);
  66
  67 #endif /* ROTATION_THREAD_H */