[lttng-tools.git] / src / common / consumer-timer.h

/*
 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
 *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *               2012 - David Goulet <dgoulet@efficios.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef CONSUMER_TIMER_H
#define CONSUMER_TIMER_H

#include <pthread.h>

#include "consumer.h"

#define LTTNG_CONSUMER_SIG_SWITCH	SIGRTMIN + 10
#define LTTNG_CONSUMER_SIG_TEARDOWN	SIGRTMIN + 11

#define CLOCKID CLOCK_MONOTONIC

/*
 * Handle timer teardown race wrt memory free of private data by consumer
 * signals are handled by a single thread, which permits a synchronization
 * point between handling of each signal. Internal lock ensures mutual
 * exclusion.
 */
struct timer_signal_data {
	pthread_t tid;	/* thread id managing signals */
	int setup_done;
	int qs_done;
	pthread_mutex_t lock;
};

void consumer_timer_switch_start(struct lttng_consumer_channel *channel,
		unsigned int switch_timer_interval);
void consumer_timer_switch_stop(struct lttng_consumer_channel *channel);
void *consumer_timer_metadata_thread(void *data);
void consumer_signal_init(void);

#endif /* CONSUMER_TIMER_H */
Commit	Line	Data
	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
	30	#define CLOCKID CLOCK_MONOTONIC
	31
	32	/*
	33	* Handle timer teardown race wrt memory free of private data by consumer
	34	* signals are handled by a single thread, which permits a synchronization
	35	* point between handling of each signal. Internal lock ensures mutual
	36	* exclusion.
	37	*/
	38	struct timer_signal_data {
	39	pthread_t tid; /* thread id managing signals */
	40	int setup_done;
	41	int qs_done;
	42	pthread_mutex_t lock;
	43	};
	44
	45	void consumer_timer_switch_start(struct lttng_consumer_channel *channel,
	46	unsigned int switch_timer_interval);
	47	void consumer_timer_switch_stop(struct lttng_consumer_channel *channel);
	48	void consumer_timer_metadata_thread(void data);
	49	void consumer_signal_init(void);
	50
	51	#endif /* CONSUMER_TIMER_H */