1 /***
2 This file is part of PulseAudio.
3
4 Copyright 2009 Lennart Poettering
5
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
10
11 PulseAudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
18 ***/
19
20 #ifdef HAVE_CONFIG_H
21 #include <config.h>
22 #endif
23
24 #include <pulse/rtclock.h>
25
26 #include <pulsecore/log.h>
27 #include <pulsecore/mutex.h>
28
29 #include "ratelimit.h"
30
31 static pa_static_mutex mutex = PA_STATIC_MUTEX_INIT;
32
33 /* Modelled after Linux' lib/ratelimit.c by Dave Young
34 * <hidave.darkstar@gmail.com>, which is licensed GPLv2. */
35
pa_ratelimit_test(pa_ratelimit * r,pa_log_level_t t)36 bool pa_ratelimit_test(pa_ratelimit *r, pa_log_level_t t) {
37 pa_usec_t now;
38 pa_mutex *m;
39
40 now = pa_rtclock_now();
41
42 m = pa_static_mutex_get(&mutex, false, false);
43 pa_mutex_lock(m);
44
45 pa_assert(r);
46 pa_assert(r->interval > 0);
47 pa_assert(r->burst > 0);
48
49 if (r->begin <= 0 ||
50 r->begin + r->interval < now) {
51
52 if (r->n_missed > 0)
53 pa_logl(t, "%u events suppressed", r->n_missed);
54
55 r->begin = now;
56
57 /* Reset counters */
58 r->n_printed = 0;
59 r->n_missed = 0;
60 goto good;
61 }
62
63 if (r->n_printed <= r->burst)
64 goto good;
65
66 r->n_missed++;
67 pa_mutex_unlock(m);
68 return false;
69
70 good:
71 r->n_printed++;
72 pa_mutex_unlock(m);
73 return true;
74 }
75