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         pthread_t tid;  /* thread id managing signals */
  40         int setup_done;
  41         int qs_done;
  42         pthread_mutex_t lock;
  43 };
  44
  45 struct timer_thread_parameters {
  46         int rotate_timer_pipe;
  47 };
  48
  49 struct sessiond_rotation_timer {
  50         uint64_t session_id;
  51         unsigned int signal;
  52 } LTTNG_PACKED;
  53
  54 void *sessiond_timer_thread(void *data);
  55 int sessiond_timer_signal_init(void);
  56
  57 int sessiond_timer_rotate_pending_start(struct ltt_session *session, unsigned int
  58                 interval_us);
  59 void sessiond_timer_rotate_pending_stop(struct ltt_session *session);
  60
  61 int sessiond_rotate_timer_start(struct ltt_session *session,
  62                 unsigned int interval_us);
  63
  64 void sessiond_rotate_timer_stop(struct ltt_session *session);
  65
  66 #endif /* SESSIOND_TIMER_H */