1 /* $KAME: timer.c,v 1.4 2000/05/27 11:30:43 jinmei Exp $ */
4 * Copyright (C) 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $FreeBSD: src/usr.sbin/rtadvd/timer.c,v 1.1.2.3 2002/06/29 18:59:53 ume Exp $
40 #if defined(__NetBSD__) || defined(__OpenBSD__)
45 static struct rtadvd_timer timer_head;
47 #define MILLION 1000000
48 #define TIMEVAL_EQUAL(t1,t2) ((t1)->tv_sec == (t2)->tv_sec &&\
49 (t1)->tv_usec == (t2)->tv_usec)
51 static struct timeval tm_max = {0x7fffffff, 0x7fffffff};
56 memset(&timer_head, 0, sizeof(timer_head));
58 timer_head.next = timer_head.prev = &timer_head;
59 timer_head.tm = tm_max;
63 rtadvd_add_timer(struct rtadvd_timer *(*timeout) __P((void *)),
64 void (*update) __P((void *, struct timeval *)),
65 void *timeodata, void *updatedata)
67 struct rtadvd_timer *newtimer;
69 if ((newtimer = malloc(sizeof(*newtimer))) == NULL) {
71 "<%s> can't allocate memory", __FUNCTION__);
75 memset(newtimer, 0, sizeof(*newtimer));
77 if (timeout == NULL) {
79 "<%s> timeout function unspecfied", __FUNCTION__);
82 newtimer->expire = timeout;
83 newtimer->update = update;
84 newtimer->expire_data = timeodata;
85 newtimer->update_data = updatedata;
86 newtimer->tm = tm_max;
89 insque(newtimer, &timer_head);
95 rtadvd_remove_timer(struct rtadvd_timer **timer)
103 rtadvd_set_timer(struct timeval *tm, struct rtadvd_timer *timer)
107 /* reset the timer */
108 gettimeofday(&now, NULL);
110 TIMEVAL_ADD(&now, tm, &timer->tm);
112 /* update the next expiration time */
113 if (TIMEVAL_LT(timer->tm, timer_head.tm))
114 timer_head.tm = timer->tm;
120 * Check expiration for each timer. If a timer expires,
121 * call the expire function for the timer and update the timer.
122 * Return the next interval for select() call.
127 static struct timeval returnval;
129 struct rtadvd_timer *tm = timer_head.next, *tm_next;
131 gettimeofday(&now, NULL);
133 timer_head.tm = tm_max;
135 for (tm = timer_head.next; tm != &timer_head; tm = tm_next) {
138 if (TIMEVAL_LEQ(tm->tm, now)) {
139 if (((*tm->expire)(tm->expire_data) == NULL))
140 continue; /* the timer was removed */
142 (*tm->update)(tm->update_data, &tm->tm);
143 TIMEVAL_ADD(&tm->tm, &now, &tm->tm);
146 if (TIMEVAL_LT(tm->tm, timer_head.tm))
147 timer_head.tm = tm->tm;
150 if (TIMEVAL_EQUAL(&tm_max, &timer_head.tm)) {
151 /* no need to timeout */
154 else if (TIMEVAL_LT(timer_head.tm, now)) {
155 /* this may occur when the interval is too small */
156 returnval.tv_sec = returnval.tv_usec = 0;
159 TIMEVAL_SUB(&timer_head.tm, &now, &returnval);
164 rtadvd_timer_rest(struct rtadvd_timer *timer)
166 static struct timeval returnval, now;
168 gettimeofday(&now, NULL);
169 if (TIMEVAL_LEQ(timer->tm, now)) {
171 "<%s> a timer must be expired, but not yet",
173 returnval.tv_sec = returnval.tv_usec = 0;
176 TIMEVAL_SUB(&timer->tm, &now, &returnval);
183 TIMEVAL_ADD(struct timeval *a, struct timeval *b, struct timeval *result)
187 if ((l = a->tv_usec + b->tv_usec) < MILLION) {
189 result->tv_sec = a->tv_sec + b->tv_sec;
192 result->tv_usec = l - MILLION;
193 result->tv_sec = a->tv_sec + b->tv_sec + 1;
199 * XXX: this function assumes that a >= b.
202 TIMEVAL_SUB(struct timeval *a, struct timeval *b, struct timeval *result)
206 if ((l = a->tv_usec - b->tv_usec) >= 0) {
208 result->tv_sec = a->tv_sec - b->tv_sec;
211 result->tv_usec = MILLION + l;
212 result->tv_sec = a->tv_sec - b->tv_sec - 1;