Sessiond timer thread
[lttng-tools.git] / src / bin / lttng-sessiond / sessiond-timer.h
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1/*
2 * Copyright (C) 2017 - Julien Desfossez <jdesfossez@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as 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
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18#ifndef SESSIOND_TIMER_H
19#define SESSIOND_TIMER_H
20
21#include <pthread.h>
22
23#include "session.h"
24
25#define LTTNG_SESSIOND_SIG_TEARDOWN SIGRTMIN + 10
26#define LTTNG_SESSIOND_SIG_EXIT SIGRTMIN + 11
27
28#define CLOCKID CLOCK_MONOTONIC
29
30/*
31 * Handle timer teardown race wrt memory free of private data by sessiond
32 * signals are handled by a single thread, which permits a synchronization
33 * point between handling of each signal. Internal lock ensures mutual
34 * exclusion.
35 */
36struct timer_signal_data {
37 /* Thread managing signals. */
38 pthread_t tid;
39 int qs_done;
40 pthread_mutex_t lock;
41};
42
43struct timer_thread_parameters {
44 struct rotation_thread_timer_queue *rotation_timer_queue;
45};
46
47struct sessiond_rotation_timer {
48 uint64_t session_id;
49 unsigned int signal;
50 /* List member in struct rotation_thread_timer_queue. */
51 struct cds_list_head head;
52};
53
54void *sessiond_timer_thread(void *data);
55int sessiond_timer_signal_init(void);
56
57#endif /* SESSIOND_TIMER_H */
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