Simplify lock handling in enqueue_timer_rotate_job()
[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
d88744a4 27#define LTTNG_SESSIOND_SIG_ROTATE_PENDING SIGRTMIN + 12
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28
29#define CLOCKID CLOCK_MONOTONIC
30
31/*
32 * Handle timer teardown race wrt memory free of private data by sessiond
33 * signals are handled by a single thread, which permits a synchronization
34 * point between handling of each signal. Internal lock ensures mutual
35 * exclusion.
36 */
37struct timer_signal_data {
38 /* Thread managing signals. */
39 pthread_t tid;
40 int qs_done;
41 pthread_mutex_t lock;
42};
43
44struct timer_thread_parameters {
45 struct rotation_thread_timer_queue *rotation_timer_queue;
46};
47
48struct sessiond_rotation_timer {
49 uint64_t session_id;
50 unsigned int signal;
51 /* List member in struct rotation_thread_timer_queue. */
52 struct cds_list_head head;
53};
54
55void *sessiond_timer_thread(void *data);
56int sessiond_timer_signal_init(void);
57
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58int sessiond_timer_rotate_pending_start(struct ltt_session *session, unsigned int
59 interval_us);
60void sessiond_timer_rotate_pending_stop(struct ltt_session *session);
61
d086f507 62#endif /* SESSIOND_TIMER_H */
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