src/bin/lttng-sessiond/notification-thread-internal.h

   1 /*
   2  * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@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 NOTIFICATION_THREAD_INTERNAL_H
  19 #define NOTIFICATION_THREAD_INTERNAL_H
  20
  21 #include <lttng/ref-internal.h>
  22 #include <urcu/rculfhash.h>
  23 #include <unistd.h>
  24
  25 struct channel_key {
  26         uint64_t key;
  27         enum lttng_domain_type domain;
  28 };
  29
  30 struct session_info {
  31         struct lttng_ref ref;
  32         char *name;
  33         uid_t uid;
  34         gid_t gid;
  35         /*
  36          * Hashtable containing back-refs (weak) to all channels in this session.
  37          * The hashtable's key is a hash of (struct channel_key) and
  38          * the value is of type (struct channel_info *).
  39          */
  40         struct cds_lfht *channel_infos_ht;
  41         struct lttng_session_trigger_list *trigger_list;
  42         /* Node in the notification thread state's sessions_ht. */
  43         struct cds_lfht_node sessions_ht_node;
  44         /*
  45          * Weak reference to the thread state's sessions_ht. Used for removal on
  46          * destruction.
  47          */
  48         struct cds_lfht *sessions_ht;
  49         uint64_t consumed_data_size;
  50         struct {
  51                 /* Whether a rotation is ongoing for this session. */
  52                 bool ongoing;
  53                 /* Identifier of the currently ongoing rotation. */
  54                 uint64_t id;
  55         } rotation;
  56 };
  57
  58 struct channel_info {
  59         struct channel_key key;
  60         char *name;
  61         uint64_t capacity;
  62         /*
  63          * A channel info holds a reference (lttng_ref) on session_info.
  64          * session_info, in return, holds a weak reference to the channel.
  65          */
  66         struct session_info *session_info;
  67         /* Node in the notification thread state's channels_ht. */
  68         struct cds_lfht_node channels_ht_node;
  69         /* Node in the session_info's channels_ht. */
  70         struct cds_lfht_node session_info_channels_ht_node;
  71 };
  72
  73 #endif /* NOTIFICATION_THREAD_INTERNAL_H */