2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
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.
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.
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.
18 #ifndef _LTT_SESSIOND_H
19 #define _LTT_SESSIOND_H
23 #include <urcu/wfqueue.h>
25 #include <common/sessiond-comm/sessiond-comm.h>
26 #include <common/compat/poll.h>
27 #include <common/compat/socket.h>
32 extern const char default_home_dir
[],
33 default_tracing_group
[],
34 default_ust_sock_dir
[],
35 default_global_apps_pipe
[];
37 /* Set in main.c at boot time of the daemon */
38 extern int kernel_tracer_fd
;
41 * This contains extra data needed for processing a command received by the
42 * session daemon from the lttng client.
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
;
55 struct ust_register_msg reg_msg
;
56 struct cds_wfq_node node
;
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
63 struct ust_cmd_queue
{
65 struct cds_wfq_queue queue
;
69 * This is the wait queue containing wait nodes during the application
70 * registration process.
72 struct ust_reg_wait_queue
{
74 struct cds_list_head head
;
78 * Use by the dispatch registration to queue UST command socket to wait for the
81 struct ust_reg_wait_node
{
83 struct cds_list_head head
;
87 * This pipe is used to inform the thread managing application notify
88 * communication that a command is queued and ready to be processed.
90 extern int apps_cmd_notify_pipe
[2];
93 * Used to notify that a hash table needs to be destroyed by dedicated
94 * thread. Required by design because we don't want to move destroy
95 * paths outside of large RCU read-side lock paths, and destroy cannot
96 * be called by call_rcu thread, because it may hang (waiting for
97 * call_rcu completion).
99 extern int ht_cleanup_pipe
[2];
102 * Populated when the daemon starts with the current page size of the system.
104 extern long page_size
;
106 int sessiond_set_thread_pollset(struct lttng_poll_event
*events
, size_t size
);
107 int sessiond_check_thread_quit_pipe(int fd
, uint32_t events
);
109 void *thread_ht_cleanup(void *data
);
111 #endif /* _LTT_SESSIOND_H */
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