diff options
author | Lennart Poettering <lennart@poettering.net> | 2005-08-12 19:09:50 +0000 |
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committer | Lennart Poettering <lennart@poettering.net> | 2005-08-12 19:09:50 +0000 |
commit | 5d047523c87ba11aad8c384f7ffde25b4dd746ed (patch) | |
tree | b160aa74a0c9e77db3bc9b864f503771adaa6758 /avahi-common/timeval.c | |
parent | f8c479234af6b676027df4fb6b38ce8e22949049 (diff) |
implement new main loop abstraction layer
git-svn-id: file:///home/lennart/svn/public/avahi/trunk@305 941a03a8-eaeb-0310-b9a0-b1bbd8fe43fe
Diffstat (limited to 'avahi-common/timeval.c')
-rw-r--r-- | avahi-common/timeval.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/avahi-common/timeval.c b/avahi-common/timeval.c new file mode 100644 index 0000000..e5732cd --- /dev/null +++ b/avahi-common/timeval.c @@ -0,0 +1,101 @@ +/* $Id$ */ + +/*** + This file is part of avahi. + + avahi is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + avahi is distributed in the hope that it will be useful, but WITHOUT + ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General + Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with avahi; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdlib.h> +#include <assert.h> + +#include "timeval.h" + +int avahi_timeval_compare(const struct timeval *a, const struct timeval *b) { + assert(a); + assert(b); + + if (a->tv_sec < b->tv_sec) + return -1; + + if (a->tv_sec > b->tv_sec) + return 1; + + if (a->tv_usec < b->tv_usec) + return -1; + + if (a->tv_usec > b->tv_usec) + return 1; + + return 0; +} + +AvahiUsec avahi_timeval_diff(const struct timeval *a, const struct timeval *b) { + assert(a); + assert(b); + + if (avahi_timeval_compare(a, b) < 0) + return - avahi_timeval_diff(b, a); + + return ((AvahiUsec) a->tv_sec - b->tv_sec)*1000000 + a->tv_usec - b->tv_usec; +} + +struct timeval* avahi_timeval_add(struct timeval *a, AvahiUsec usec) { + AvahiUsec u; + assert(a); + + u = usec + a->tv_usec; + + if (u < 0) { + a->tv_usec = (long) (1000000 + (u % 1000000)); + a->tv_sec += (long) (-1 + (u / 1000000)); + } else { + a->tv_usec = (long) (u % 1000000); + a->tv_sec += (long) (u / 1000000); + } + + return a; +} + +AvahiUsec avahi_age(const struct timeval *a) { + struct timeval now; + + assert(a); + + gettimeofday(&now, NULL); + + return avahi_timeval_diff(&now, a); +} + + +struct timeval *avahi_elapse_time(struct timeval *tv, unsigned msec, unsigned jitter) { + assert(tv); + + gettimeofday(tv, NULL); + + if (msec) + avahi_timeval_add(tv, (AvahiUsec) msec*1000); + + if (jitter) + avahi_timeval_add(tv, (AvahiUsec) (jitter*1000.0*rand()/(RAND_MAX+1.0))); + + return tv; +} + |