Commit | Line | Data |
---|---|---|
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 | #define _GNU_SOURCE | |
19 | #include <assert.h> | |
20 | #include <inttypes.h> | |
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
8809eec0 | 23 | #include <time.h> |
44a5e5eb | 24 | |
8809eec0 | 25 | #include <common/defaults.h> |
44a5e5eb DG |
26 | #include <common/error.h> |
27 | ||
28 | #include "health.h" | |
29 | ||
8809eec0 MD |
30 | static const struct timespec time_delta = { |
31 | .tv_sec = DEFAULT_HEALTH_CHECK_DELTA_S, | |
32 | .tv_nsec = DEFAULT_HEALTH_CHECK_DELTA_NS, | |
33 | }; | |
34 | ||
35 | /* | |
36 | * Set time difference in res from time_a and time_b. | |
37 | */ | |
38 | static void time_diff(const struct timespec *time_a, | |
39 | const struct timespec *time_b, struct timespec *res) | |
40 | { | |
41 | if (time_a->tv_nsec - time_b->tv_nsec < 0) { | |
42 | res->tv_sec = time_a->tv_sec - time_b->tv_sec - 1; | |
43 | res->tv_nsec = 1000000000L + time_a->tv_sec - time_b->tv_sec; | |
44 | } else { | |
45 | res->tv_sec = time_a->tv_sec - time_b->tv_sec; | |
931a97e5 | 46 | res->tv_nsec = time_a->tv_nsec - time_b->tv_nsec; |
8809eec0 MD |
47 | } |
48 | } | |
49 | ||
50 | /* | |
51 | * Return true if time_a - time_b > diff, else false. | |
52 | */ | |
53 | static int time_diff_gt(const struct timespec *time_a, | |
54 | const struct timespec *time_b, const struct timespec *diff) | |
55 | { | |
56 | struct timespec res; | |
57 | ||
58 | time_diff(time_a, time_b, &res); | |
59 | time_diff(&res, diff, &res); | |
60 | ||
61 | if (res.tv_sec > 0) { | |
62 | return 1; | |
63 | } else if (res.tv_sec == 0 && res.tv_nsec > 0) { | |
64 | return 1; | |
65 | } | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
44a5e5eb DG |
70 | /* |
71 | * Check health of a specific health state counter. | |
72 | * | |
73 | * Return 0 if health is bad or else 1. | |
74 | */ | |
75 | int health_check_state(struct health_state *state) | |
76 | { | |
8809eec0 | 77 | int retval = 1, ret; |
139ac872 | 78 | unsigned long current, last; |
8809eec0 | 79 | struct timespec current_time; |
44a5e5eb DG |
80 | |
81 | assert(state); | |
82 | ||
139ac872 | 83 | last = state->last; |
44a5e5eb | 84 | current = uatomic_read(&state->current); |
44a5e5eb | 85 | |
8809eec0 | 86 | ret = clock_gettime(CLOCK_MONOTONIC, ¤t_time); |
931a97e5 | 87 | if (ret < 0) { |
8809eec0 | 88 | PERROR("Error reading time\n"); |
139ac872 | 89 | /* error */ |
8809eec0 MD |
90 | retval = 0; |
91 | goto end; | |
44a5e5eb DG |
92 | } |
93 | ||
8809eec0 MD |
94 | /* |
95 | * Thread is in bad health if flag HEALTH_ERROR is set. It is also in bad | |
96 | * health if, after the delta delay has passed, its the progress counter | |
97 | * has not moved and it has NOT been waiting for a poll() call. | |
98 | */ | |
99 | if (uatomic_read(&state->flags) & HEALTH_ERROR) { | |
100 | retval = 0; | |
101 | goto end; | |
102 | } | |
44a5e5eb | 103 | |
139ac872 | 104 | /* |
8809eec0 MD |
105 | * Initial condition need to update the last counter and sample time, but |
106 | * should not check health in this initial case, because we don't know how | |
107 | * much time has passed. | |
139ac872 | 108 | */ |
8809eec0 MD |
109 | if (state->last_time.tv_sec == 0 && state->last_time.tv_nsec == 0) { |
110 | /* update last counter and last sample time */ | |
111 | state->last = current; | |
112 | memcpy(&state->last_time, ¤t_time, sizeof(current_time)); | |
113 | } else { | |
114 | if (time_diff_gt(¤t_time, &state->last_time, &time_delta)) { | |
115 | if (current == last && !HEALTH_IS_IN_POLL(current)) { | |
116 | /* error */ | |
117 | retval = 0; | |
118 | } | |
119 | /* update last counter and last sample time */ | |
120 | state->last = current; | |
121 | memcpy(&state->last_time, ¤t_time, sizeof(current_time)); | |
122 | } | |
123 | } | |
124 | ||
125 | end: | |
77c7c900 | 126 | DBG("Health state current %lu, last %lu, ret %d", |
8809eec0 | 127 | current, last, ret); |
139ac872 | 128 | |
8809eec0 | 129 | return retval; |
44a5e5eb | 130 | } |