Add time validation to health check
[lttng-tools.git] / src / bin / lttng-sessiond / health.h
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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>
8809eec0 22#include <time.h>
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23#include <urcu/uatomic.h>
24
25/*
26 * These are the value added to the current state depending of the position in
27 * the thread where is either waiting on a poll() or running in the code.
28 */
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29#define HEALTH_POLL_VALUE (1UL << 0)
30#define HEALTH_CODE_VALUE (1UL << 1)
44a5e5eb 31
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32#define HEALTH_IS_IN_POLL(x) ((x) & HEALTH_POLL_VALUE)
33
34enum health_flags {
8809eec0 35 HEALTH_EXIT = (1U << 0),
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36 HEALTH_ERROR = (1U << 1),
37};
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38
39struct health_state {
139ac872 40 /*
8809eec0 41 * last counter and last_time are only read and updated by the health_check
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42 * thread (single updater).
43 */
44 unsigned long last;
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45 struct timespec last_time;
46
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47 /*
48 * current and flags are updated by multiple threads concurrently.
49 */
50 unsigned long current; /* progress counter, updated atomically */
51 enum health_flags flags; /* other flags, updated atomically */
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52};
53
54/* Health state counters for the client command thread */
55extern struct health_state health_thread_cmd;
56
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57/* Health state counters for the application management thread */
58extern struct health_state health_thread_app_manage;
59
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60/* Health state counters for the application registration thread */
61extern struct health_state health_thread_app_reg;
62
63/* Health state counters for the kernel thread */
64extern struct health_state health_thread_kernel;
65
66/*
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67 * Update current counter by 1 to indicate that the thread entered or
68 * left a blocking state caused by a poll().
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69 */
70static inline void health_poll_update(struct health_state *state)
71{
72 assert(state);
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73 uatomic_add(&state->current, HEALTH_POLL_VALUE);
74}
75
76/*
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77 * Update current counter by 2 indicates progress in execution of a
78 * thread.
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79 */
80static inline void health_code_update(struct health_state *state)
81{
82 assert(state);
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83 uatomic_add(&state->current, HEALTH_CODE_VALUE);
84}
85
86/*
139ac872 87 * Set health "exit" flag.
44a5e5eb 88 */
139ac872 89static inline void health_exit(struct health_state *state)
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90{
91 assert(state);
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92 uatomic_or(&state->flags, HEALTH_EXIT);
93}
44a5e5eb 94
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95/*
96 * Set health "error" flag.
97 */
98static inline void health_error(struct health_state *state)
99{
100 assert(state);
101 uatomic_or(&state->flags, HEALTH_ERROR);
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102}
103
104/*
105 * Init health state.
106 */
107static inline void health_init(struct health_state *state)
108{
109 assert(state);
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110 state->last = 0;
111 state->last_time.tv_sec = 0;
112 state->last_time.tv_nsec = 0;
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113 uatomic_set(&state->current, 0);
114 uatomic_set(&state->flags, 0);
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115}
116
117int health_check_state(struct health_state *state);
118
119#endif /* _HEALTH_H */
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