Size-based rotation
[lttng-tools.git] / 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 */
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