src/common/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
  31 #define CLOCKID CLOCK_MONOTONIC
  32
  33 /*
  34  * Handle timer teardown race wrt memory free of private data by consumer
  35  * signals are handled by a single thread, which permits a synchronization
  36  * point between handling of each signal. Internal lock ensures mutual
  37  * exclusion.
  38  */
  39 struct timer_signal_data {
  40         pthread_t tid;  /* thread id managing signals */
  41         int setup_done;
  42         int qs_done;
  43         pthread_mutex_t lock;
  44 };
  45
  46 void consumer_timer_switch_start(struct lttng_consumer_channel *channel,
  47                 unsigned int switch_timer_interval);
  48 void consumer_timer_switch_stop(struct lttng_consumer_channel *channel);
  49 void consumer_timer_live_start(struct lttng_consumer_channel *channel,
  50                 int live_timer_interval);
  51 void consumer_timer_live_stop(struct lttng_consumer_channel *channel);
  52 void *consumer_timer_thread(void *data);
  53 void consumer_signal_init(void);
  54
  55 #endif /* CONSUMER_TIMER_H */