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 #define LTTNG_SESSIOND_SIG_ROTATE_TIMER         SIGRTMIN + 13
  29
  30 #define CLOCKID CLOCK_MONOTONIC
  31
  32 /*
  33  * Handle timer teardown race wrt memory free of private data by sessiond
  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         /* Thread managing signals. */
  40         pthread_t tid;
  41         int qs_done;
  42         pthread_mutex_t lock;
  43 };
  44
  45 struct timer_thread_parameters {
  46         struct rotation_thread_timer_queue *rotation_timer_queue;
  47 };
  48
  49 struct sessiond_rotation_timer {
  50         uint64_t session_id;
  51         unsigned int signal;
  52         /* List member in struct rotation_thread_timer_queue. */
  53         struct cds_list_head head;
  54 };
  55
  56 void *sessiond_timer_thread(void *data);
  57 int sessiond_timer_signal_init(void);
  58
  59 int sessiond_timer_rotate_pending_start(struct ltt_session *session,
  60                 unsigned int interval_us);
  61 int sessiond_timer_rotate_pending_stop(struct ltt_session *session);
  62
  63 int sessiond_rotate_timer_start(struct ltt_session *session,
  64                 unsigned int interval_us);
  65 int sessiond_rotate_timer_stop(struct ltt_session *session);
  66
  67 #endif /* SESSIOND_TIMER_H */