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44a5e5eb DG |
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 | ||
86acf0da | 21 | #include <assert.h> |
8809eec0 | 22 | #include <time.h> |
44a5e5eb DG |
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 | */ | |
139ac872 MD |
29 | #define HEALTH_POLL_VALUE (1UL << 0) |
30 | #define HEALTH_CODE_VALUE (1UL << 1) | |
44a5e5eb | 31 | |
139ac872 MD |
32 | #define HEALTH_IS_IN_POLL(x) ((x) & HEALTH_POLL_VALUE) |
33 | ||
34 | enum health_flags { | |
8809eec0 | 35 | HEALTH_EXIT = (1U << 0), |
139ac872 MD |
36 | HEALTH_ERROR = (1U << 1), |
37 | }; | |
44a5e5eb DG |
38 | |
39 | struct health_state { | |
139ac872 | 40 | /* |
8809eec0 | 41 | * last counter and last_time are only read and updated by the health_check |
139ac872 MD |
42 | * thread (single updater). |
43 | */ | |
44 | unsigned long last; | |
8809eec0 MD |
45 | struct timespec last_time; |
46 | ||
139ac872 MD |
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 */ | |
44a5e5eb DG |
52 | }; |
53 | ||
54 | /* Health state counters for the client command thread */ | |
55 | extern struct health_state health_thread_cmd; | |
56 | ||
139ac872 MD |
57 | /* Health state counters for the application management thread */ |
58 | extern struct health_state health_thread_app_manage; | |
59 | ||
44a5e5eb DG |
60 | /* Health state counters for the application registration thread */ |
61 | extern struct health_state health_thread_app_reg; | |
62 | ||
63 | /* Health state counters for the kernel thread */ | |
64 | extern struct health_state health_thread_kernel; | |
65 | ||
66 | /* | |
139ac872 MD |
67 | * Update current counter by 1 to indicate that the thread entered or |
68 | * left a blocking state caused by a poll(). | |
44a5e5eb DG |
69 | */ |
70 | static inline void health_poll_update(struct health_state *state) | |
71 | { | |
72 | assert(state); | |
44a5e5eb DG |
73 | uatomic_add(&state->current, HEALTH_POLL_VALUE); |
74 | } | |
75 | ||
76 | /* | |
139ac872 MD |
77 | * Update current counter by 2 indicates progress in execution of a |
78 | * thread. | |
44a5e5eb DG |
79 | */ |
80 | static inline void health_code_update(struct health_state *state) | |
81 | { | |
82 | assert(state); | |
44a5e5eb DG |
83 | uatomic_add(&state->current, HEALTH_CODE_VALUE); |
84 | } | |
85 | ||
86 | /* | |
139ac872 | 87 | * Set health "exit" flag. |
44a5e5eb | 88 | */ |
139ac872 | 89 | static inline void health_exit(struct health_state *state) |
44a5e5eb DG |
90 | { |
91 | assert(state); | |
139ac872 MD |
92 | uatomic_or(&state->flags, HEALTH_EXIT); |
93 | } | |
44a5e5eb | 94 | |
139ac872 MD |
95 | /* |
96 | * Set health "error" flag. | |
97 | */ | |
98 | static inline void health_error(struct health_state *state) | |
99 | { | |
100 | assert(state); | |
101 | uatomic_or(&state->flags, HEALTH_ERROR); | |
44a5e5eb DG |
102 | } |
103 | ||
104 | /* | |
105 | * Init health state. | |
106 | */ | |
107 | static inline void health_init(struct health_state *state) | |
108 | { | |
109 | assert(state); | |
8809eec0 MD |
110 | state->last = 0; |
111 | state->last_time.tv_sec = 0; | |
112 | state->last_time.tv_nsec = 0; | |
139ac872 MD |
113 | uatomic_set(&state->current, 0); |
114 | uatomic_set(&state->flags, 0); | |
44a5e5eb DG |
115 | } |
116 | ||
117 | int health_check_state(struct health_state *state); | |
118 | ||
119 | #endif /* _HEALTH_H */ |