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1e2e8133 LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
2 | ||
3 | #include <assert.h> | |
4 | ||
5 | #include "ratelimit.h" | |
6 | #include "log.h" | |
7 | ||
8 | /* Modelled after Linux' lib/ratelimit.c by Dave Young | |
9 | * <hidave.darkstar@gmail.com>, which is licensed GPLv2. */ | |
10 | ||
11 | bool ratelimit_test(RateLimit *r) { | |
12 | usec_t timestamp; | |
13 | ||
14 | timestamp = now(CLOCK_MONOTONIC); | |
15 | ||
16 | assert(r); | |
17 | assert(r->interval > 0); | |
18 | assert(r->burst > 0); | |
19 | ||
20 | if (r->begin <= 0 || | |
21 | r->begin + r->interval < timestamp) { | |
22 | ||
23 | if (r->n_missed > 0) | |
24 | log_warning("%u events suppressed", r->n_missed); | |
25 | ||
26 | r->begin = timestamp; | |
27 | ||
28 | /* Reset counters */ | |
29 | r->n_printed = 0; | |
30 | r->n_missed = 0; | |
31 | goto good; | |
32 | } | |
33 | ||
34 | if (r->n_printed <= r->burst) | |
35 | goto good; | |
36 | ||
37 | r->n_missed++; | |
38 | return false; | |
39 | ||
40 | good: | |
41 | r->n_printed++; | |
42 | return true; | |
43 | } |