src/bin/lttng-sessiond/rotation-thread.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 it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * 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 with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #ifndef ROTATION_THREAD_H
  19 #define ROTATION_THREAD_H
  20
  21 #include <urcu/list.h>
  22 #include <urcu.h>
  23 #include <urcu/rculfhash.h>
  24 #include <lttng/domain.h>
  25 #include <common/pipe.h>
  26 #include <common/compat/poll.h>
  27 #include <common/hashtable/hashtable.h>
  28 #include <pthread.h>
  29
  30 struct rotation_channel_key {
  31         uint64_t key;
  32         enum lttng_domain_type domain;
  33 };
  34
  35 struct rotation_channel_info {
  36         union {
  37                 struct ltt_kernel_channel *kchan;
  38                 struct ltt_ust_channel *uchan;
  39         } chan;
  40         struct ltt_session *session;
  41         struct rotation_channel_key channel_key;
  42         struct cds_lfht_node rotate_channels_ht_node;
  43 };
  44
  45 struct rotation_thread_handle {
  46         /*
  47          * Read side of pipes used to receive channel status info collected
  48          * by the various consumer daemons.
  49          */
  50         int ust32_consumer;
  51         int ust64_consumer;
  52         int kernel_consumer;
  53         int thread_quit_pipe;
  54 };
  55
  56 struct rotation_thread_state {
  57         struct lttng_poll_event events;
  58 };
  59
  60 /* rotation_thread_data takes ownership of the channel rotate pipes. */
  61 struct rotation_thread_handle *rotation_thread_handle_create(
  62                 struct lttng_pipe *ust32_channel_rotate_pipe,
  63                 struct lttng_pipe *ust64_channel_rotate_pipe,
  64                 struct lttng_pipe *kernel_channel_rotate_pipe,
  65                 int thread_quit_pipe);
  66
  67 void rotation_thread_handle_destroy(
  68                 struct rotation_thread_handle *handle);
  69
  70 void rotation_thread_quit(struct rotation_thread_handle *handle);
  71
  72 int rotate_add_channel_pending(uint64_t key, enum lttng_domain_type domain,
  73                 struct ltt_session *session);
  74
  75 void *thread_rotation(void *data);
  76
  77 #endif /* ROTATION_THREAD_H */