[lttng-tools.git] / src / bin / lttng-sessiond / notification-thread-internal.h

/*
 * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License, version 2 only, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef NOTIFICATION_THREAD_INTERNAL_H
#define NOTIFICATION_THREAD_INTERNAL_H

#include <lttng/ref-internal.h>
#include <urcu/rculfhash.h>
#include <unistd.h>

struct channel_key {
	uint64_t key;
	enum lttng_domain_type domain;
};

struct session_info {
	struct lttng_ref ref;
	char *name;
	uid_t uid;
	gid_t gid;
	/*
	 * Hashtable containing back-refs (weak) to all channels in this session.
	 * The hashtable's key is a hash of (struct channel_key) and
	 * the value is of type (struct channel_info *).
	 */
	struct cds_lfht *channel_infos_ht;
	struct lttng_session_trigger_list *trigger_list;
	/* Node in the notification thread state's sessions_ht. */
	struct cds_lfht_node sessions_ht_node;
	/*
	 * Weak reference to the thread state's sessions_ht. Used for removal on
	 * destruction.
	 */
	struct cds_lfht *sessions_ht;
	uint64_t consumed_data_size;
	struct {
		/* Whether a rotation is ongoing for this session. */
		bool ongoing;
		/* Identifier of the currently ongoing rotation. */
		uint64_t id;
	} rotation;
	/* call_rcu delayed reclaim. */
	struct rcu_head rcu_node;
};

struct channel_info {
	struct channel_key key;
	char *name;
	uint64_t capacity;
	/*
	 * A channel info holds a reference (lttng_ref) on session_info.
	 * session_info, in return, holds a weak reference to the channel.
	 */
	struct session_info *session_info;
	/* Node in the notification thread state's channels_ht. */
	struct cds_lfht_node channels_ht_node;
	/* Node in the session_info's channels_ht. */
	struct cds_lfht_node session_info_channels_ht_node;
	/* call_rcu delayed reclaim. */
	struct rcu_head rcu_node;
};

#endif /* NOTIFICATION_THREAD_INTERNAL_H */
Commit	Line	Data
	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	/* call_rcu delayed reclaim. */
	57	struct rcu_head rcu_node;
	58	};
	59
	60	struct channel_info {
	61	struct channel_key key;
	62	char *name;
	63	uint64_t capacity;
	64	/*
	65	* A channel info holds a reference (lttng_ref) on session_info.
	66	* session_info, in return, holds a weak reference to the channel.
	67	*/
	68	struct session_info *session_info;
	69	/* Node in the notification thread state's channels_ht. */
	70	struct cds_lfht_node channels_ht_node;
	71	/* Node in the session_info's channels_ht. */
	72	struct cds_lfht_node session_info_channels_ht_node;
	73	/* call_rcu delayed reclaim. */
	74	struct rcu_head rcu_node;
	75	};
	76
	77	#endif /* NOTIFICATION_THREAD_INTERNAL_H */