Implement consumer ring buffer position sampling
[lttng-tools.git] / src / common / consumer / consumer-timer.h
1 /*
2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * 2012 - David Goulet <dgoulet@efficios.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #ifndef CONSUMER_TIMER_H
21 #define CONSUMER_TIMER_H
22
23 #include <pthread.h>
24
25 #include "consumer.h"
26
27 #define LTTNG_CONSUMER_SIG_SWITCH SIGRTMIN + 10
28 #define LTTNG_CONSUMER_SIG_TEARDOWN SIGRTMIN + 11
29 #define LTTNG_CONSUMER_SIG_LIVE SIGRTMIN + 12
30 #define LTTNG_CONSUMER_SIG_MONITOR SIGRTMIN + 13
31
32 #define CLOCKID CLOCK_MONOTONIC
33
34 /*
35 * Handle timer teardown race wrt memory free of private data by consumer
36 * signals are handled by a single thread, which permits a synchronization
37 * point between handling of each signal. Internal lock ensures mutual
38 * exclusion.
39 */
40 struct timer_signal_data {
41 pthread_t tid; /* thread id managing signals */
42 int setup_done;
43 int qs_done;
44 pthread_mutex_t lock;
45 };
46
47 void consumer_timer_switch_start(struct lttng_consumer_channel *channel,
48 unsigned int switch_timer_interval_us);
49 void consumer_timer_switch_stop(struct lttng_consumer_channel *channel);
50 void consumer_timer_live_start(struct lttng_consumer_channel *channel,
51 unsigned int live_timer_interval_us);
52 void consumer_timer_live_stop(struct lttng_consumer_channel *channel);
53 int consumer_timer_monitor_start(struct lttng_consumer_channel *channel,
54 unsigned int monitor_timer_interval_us);
55 int consumer_timer_monitor_stop(struct lttng_consumer_channel *channel);
56 void *consumer_timer_thread(void *data);
57 int consumer_signal_init(void);
58
59 int consumer_flush_kernel_index(struct lttng_consumer_stream *stream);
60 int consumer_flush_ust_index(struct lttng_consumer_stream *stream);
61
62 int consumer_timer_thread_get_channel_monitor_pipe(void);
63 int consumer_timer_thread_set_channel_monitor_pipe(int fd);
64
65 #endif /* CONSUMER_TIMER_H */
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