src/bin/lttng-sessiond/tracker.h

   1 #ifndef _LTT_TRACKER_H
   2 #define _LTT_TRACKER_H
   3
   4 /*
   5  * Copyright (C) 2018 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License, version 2 only,
   9  * as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include <lttng/session.h>
  22 #include <urcu/rculfhash.h>
  23 #include <urcu/list.h>
  24
  25 enum lttng_tracker_list_state {
  26         LTTNG_TRACK_ALL,
  27         LTTNG_TRACK_NONE,
  28         LTTNG_TRACK_LIST,
  29 };
  30
  31 /* Tracker ID */
  32 struct lttng_tracker_list_node {
  33         struct lttng_tracker_id id;
  34
  35         struct cds_list_head list_node;
  36         struct cds_lfht_node ht_node;
  37         struct rcu_head rcu_head;
  38 };
  39
  40 struct lttng_tracker_list {
  41         struct cds_list_head list_head;
  42         /* Hash table for O(1) removal lookup. */
  43         struct cds_lfht *ht;
  44         enum lttng_tracker_list_state state;
  45 };
  46
  47 struct lttng_tracker_list *lttng_tracker_list_create(void);
  48 void lttng_tracker_list_destroy(struct lttng_tracker_list *tracker_list);
  49
  50 int lttng_tracker_list_add(struct lttng_tracker_list *tracker_list,
  51                 const struct lttng_tracker_id *id);
  52 int lttng_tracker_list_remove(struct lttng_tracker_list *tracker_list,
  53                 const struct lttng_tracker_id *id);
  54
  55 int lttng_tracker_id_lookup_string(enum lttng_tracker_type tracker_type,
  56                 const struct lttng_tracker_id *id,
  57                 int *result);
  58 ssize_t lttng_tracker_id_get_list(struct lttng_tracker_list *tracker_list,
  59                 struct lttng_tracker_id **_ids);
  60 int lttng_tracker_id_set_list(struct lttng_tracker_list *tracker_list,
  61                 struct lttng_tracker_id *_ids,
  62                 size_t count);
  63
  64 #endif /* _LTT_TRACKER_H */