src/bin/lttng-sessiond/sessiond-timer.h

   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
  27 #define LTTNG_SESSIOND_SIG_ROTATE_PENDING       SIGRTMIN + 12
  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  */
  37 struct timer_signal_data {
  38         /* Thread managing signals. */
  39         pthread_t tid;
  40         int qs_done;
  41         pthread_mutex_t lock;
  42 };
  43
  44 struct timer_thread_parameters {
  45         struct rotation_thread_timer_queue *rotation_timer_queue;
  46 };
  47
  48 struct 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
  55 void *sessiond_timer_thread(void *data);
  56 int sessiond_timer_signal_init(void);
  57
  58 int sessiond_timer_rotate_pending_start(struct ltt_session *session, unsigned int
  59                 interval_us);
  60 void sessiond_timer_rotate_pending_stop(struct ltt_session *session);
  61
  62 #endif /* SESSIOND_TIMER_H */