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
  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 */