Fix: Multiple health monitoring fixes
[lttng-tools.git] / src / bin / lttng-sessiond / health.h
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@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 _HEALTH_H
19 #define _HEALTH_H
20
21 #include <stdint.h>
22 #include <urcu/uatomic.h>
23
24 /*
25 * These are the value added to the current state depending of the position in
26 * the thread where is either waiting on a poll() or running in the code.
27 */
28 #define HEALTH_POLL_VALUE (1UL << 0)
29 #define HEALTH_CODE_VALUE (1UL << 1)
30
31 #define HEALTH_IS_IN_POLL(x) ((x) & HEALTH_POLL_VALUE)
32
33 enum health_flags {
34 HEALTH_EXIT = (1U << 0),
35 HEALTH_ERROR = (1U << 1),
36 };
37
38 struct health_state {
39 /*
40 * last counter is only read and updated by the health_check
41 * thread (single updater).
42 */
43 unsigned long last;
44 /*
45 * current and flags are updated by multiple threads concurrently.
46 */
47 unsigned long current; /* progress counter, updated atomically */
48 enum health_flags flags; /* other flags, updated atomically */
49 };
50
51 /* Health state counters for the client command thread */
52 extern struct health_state health_thread_cmd;
53
54 /* Health state counters for the application management thread */
55 extern struct health_state health_thread_app_manage;
56
57 /* Health state counters for the application registration thread */
58 extern struct health_state health_thread_app_reg;
59
60 /* Health state counters for the kernel thread */
61 extern struct health_state health_thread_kernel;
62
63 /*
64 * Update current counter by 1 to indicate that the thread entered or
65 * left a blocking state caused by a poll().
66 */
67 static inline void health_poll_update(struct health_state *state)
68 {
69 assert(state);
70 uatomic_add(&state->current, HEALTH_POLL_VALUE);
71 }
72
73 /*
74 * Update current counter by 2 indicates progress in execution of a
75 * thread.
76 */
77 static inline void health_code_update(struct health_state *state)
78 {
79 assert(state);
80 uatomic_add(&state->current, HEALTH_CODE_VALUE);
81 }
82
83 /*
84 * Set health "exit" flag.
85 */
86 static inline void health_exit(struct health_state *state)
87 {
88 assert(state);
89 uatomic_or(&state->flags, HEALTH_EXIT);
90 }
91
92 /*
93 * Set health "error" flag.
94 */
95 static inline void health_error(struct health_state *state)
96 {
97 assert(state);
98 uatomic_or(&state->flags, HEALTH_ERROR);
99 }
100
101 /*
102 * Init health state.
103 */
104 static inline void health_init(struct health_state *state)
105 {
106 assert(state);
107 uatomic_set(&state->last, 0);
108 uatomic_set(&state->current, 0);
109 uatomic_set(&state->flags, 0);
110 }
111
112 int health_check_state(struct health_state *state);
113
114 #endif /* _HEALTH_H */
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