2 This file is part of avahi.
4 avahi is free software; you can redistribute it and/or modify it
5 under the terms of the GNU Lesser General Public License as
6 published by the Free Software Foundation; either version 2.1 of the
7 License, or (at your option) any later version.
9 avahi is distributed in the hope that it will be useful, but WITHOUT
10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
12 Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with avahi; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
30 int avahi_timeval_compare(const struct timeval *a, const struct timeval *b) {
34 if (a->tv_sec < b->tv_sec)
37 if (a->tv_sec > b->tv_sec)
40 if (a->tv_usec < b->tv_usec)
43 if (a->tv_usec > b->tv_usec)
49 AvahiUsec avahi_timeval_diff(const struct timeval *a, const struct timeval *b) {
53 if (avahi_timeval_compare(a, b) < 0)
54 return - avahi_timeval_diff(b, a);
56 return ((AvahiUsec) a->tv_sec - b->tv_sec)*1000000 + a->tv_usec - b->tv_usec;
59 struct timeval* avahi_timeval_add(struct timeval *a, AvahiUsec usec) {
63 u = usec + a->tv_usec;
66 a->tv_usec = (long) (1000000 + (u % 1000000));
67 a->tv_sec += (long) (-1 + (u / 1000000));
69 a->tv_usec = (long) (u % 1000000);
70 a->tv_sec += (long) (u / 1000000);
76 AvahiUsec avahi_age(const struct timeval *a) {
81 gettimeofday(&now, NULL);
83 return avahi_timeval_diff(&now, a);
86 struct timeval *avahi_elapse_time(struct timeval *tv, unsigned msec, unsigned jitter) {
89 gettimeofday(tv, NULL);
92 avahi_timeval_add(tv, (AvahiUsec) msec*1000);
95 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
97 static time_t timestamp = 0;
104 pthread_mutex_lock(&mutex);
105 if (now >= timestamp + 10) {
112 pthread_mutex_unlock(&mutex);
114 /* We use the same jitter for 10 seconds. That way our
115 * time events elapse in bursts which has the advantage that
116 * packet data can be aggregated better */
118 avahi_timeval_add(tv, (AvahiUsec) (jitter*1000.0*r/(RAND_MAX+1.0)));