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

/*
 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
 *
 * 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 _LTT_SESSIOND_H
#define _LTT_SESSIOND_H

#define _LGPL_SOURCE
#include <urcu.h>
#include <urcu/wfqueue.h>

#include <common/sessiond-comm/sessiond-comm.h>
#include <common/compat/poll.h>
#include <common/compat/socket.h>

#include "session.h"
#include "ust-app.h"

extern const char default_home_dir[],
	default_tracing_group[],
	default_ust_sock_dir[],
	default_global_apps_pipe[];

/* Set in main.c at boot time of the daemon */
extern int kernel_tracer_fd;

/*
 * This contains extra data needed for processing a command received by the
 * session daemon from the lttng client.
 */
struct command_ctx {
	int ust_sock;
	unsigned int lttng_msg_size;
	struct ltt_session *session;
	struct lttcomm_lttng_msg *llm;
	struct lttcomm_session_msg *lsm;
	lttng_sock_cred creds;
};

struct ust_command {
	int sock;
	struct ust_register_msg reg_msg;
	struct cds_wfq_node node;
};

/*
 * Queue used to enqueue UST registration request (ust_commant) and protected
 * by a futex with a scheme N wakers / 1 waiters. See futex.c/.h
 */
struct ust_cmd_queue {
	int32_t futex;
	struct cds_wfq_queue queue;
};

/*
 * This pipe is used to inform the thread managing application notify
 * communication that a command is queued and ready to be processed.
 */
extern int apps_cmd_notify_pipe[2];

/*
 * Used to notify that a hash table needs to be destroyed by dedicated
 * thread. Required by design because we don't want to move destroy
 * paths outside of large RCU read-side lock paths, and destroy cannot
 * be called by call_rcu thread, because it may hang (waiting for
 * call_rcu completion).
 */
extern int ht_cleanup_pipe[2];

/*
 * Populated when the daemon starts with the current page size of the system.
 */
extern long page_size;

int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size);
int sessiond_check_thread_quit_pipe(int fd, uint32_t events);

void *thread_ht_cleanup(void *data);

#endif /* _LTT_SESSIOND_H */
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
	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,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for 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 _LTT_SESSIOND_H
	19	#define _LTT_SESSIOND_H
	20
	21	#define _LGPL_SOURCE
	22	#include <urcu.h>
	23	#include <urcu/wfqueue.h>
	24
	25	#include <common/sessiond-comm/sessiond-comm.h>
	26	#include <common/compat/poll.h>
	27	#include <common/compat/socket.h>
	28
	29	#include "session.h"
	30	#include "ust-app.h"
	31
	32	extern const char default_home_dir[],
	33	default_tracing_group[],
	34	default_ust_sock_dir[],
	35	default_global_apps_pipe[];
	36
	37	/* Set in main.c at boot time of the daemon */
	38	extern int kernel_tracer_fd;
	39
	40	/*
	41	* This contains extra data needed for processing a command received by the
	42	* session daemon from the lttng client.
	43	*/
	44	struct command_ctx {
	45	int ust_sock;
	46	unsigned int lttng_msg_size;
	47	struct ltt_session *session;
	48	struct lttcomm_lttng_msg *llm;
	49	struct lttcomm_session_msg *lsm;
	50	lttng_sock_cred creds;
	51	};
	52
	53	struct ust_command {
	54	int sock;
	55	struct ust_register_msg reg_msg;
	56	struct cds_wfq_node node;
	57	};
	58
	59	/*
	60	* Queue used to enqueue UST registration request (ust_commant) and protected
	61	* by a futex with a scheme N wakers / 1 waiters. See futex.c/.h
	62	*/
	63	struct ust_cmd_queue {
	64	int32_t futex;
	65	struct cds_wfq_queue queue;
	66	};
	67
	68	/*
	69	* This pipe is used to inform the thread managing application notify
	70	* communication that a command is queued and ready to be processed.
	71	*/
	72	extern int apps_cmd_notify_pipe[2];
	73
	74	/*
	75	* Used to notify that a hash table needs to be destroyed by dedicated
	76	* thread. Required by design because we don't want to move destroy
	77	* paths outside of large RCU read-side lock paths, and destroy cannot
	78	* be called by call_rcu thread, because it may hang (waiting for
	79	* call_rcu completion).
	80	*/
	81	extern int ht_cleanup_pipe[2];
	82
	83	/*
	84	* Populated when the daemon starts with the current page size of the system.
	85	*/
	86	extern long page_size;
	87
	88	int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size);
	89	int sessiond_check_thread_quit_pipe(int fd, uint32_t events);
	90
	91	void thread_ht_cleanup(void data);
	92
	93	#endif /* _LTT_SESSIOND_H */