2 /* $KAME: timer.c,v 1.9 2002/06/10 19:59:47 itojun Exp $ */
5 * Copyright (C) 1998 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 static struct rtadvd_timer timer_head;
44 #define MILLION 1000000
45 #define TIMEVAL_EQUAL(t1,t2) ((t1)->tv_sec == (t2)->tv_sec &&\
46 (t1)->tv_usec == (t2)->tv_usec)
48 static struct timeval tm_max = {0x7fffffff, 0x7fffffff};
53 memset(&timer_head, 0, sizeof(timer_head));
55 timer_head.next = timer_head.prev = &timer_head;
56 timer_head.tm = tm_max;
60 rtadvd_add_timer(struct rtadvd_timer *(*timeout) __P((void *)),
61 void (*update) __P((void *, struct timeval *)),
62 void *timeodata, void *updatedata)
64 struct rtadvd_timer *newtimer;
66 if ((newtimer = malloc(sizeof(*newtimer))) == NULL) {
68 "<%s> can't allocate memory", __func__);
72 memset(newtimer, 0, sizeof(*newtimer));
74 if (timeout == NULL) {
76 "<%s> timeout function unspecified", __func__);
79 newtimer->expire = timeout;
80 newtimer->update = update;
81 newtimer->expire_data = timeodata;
82 newtimer->update_data = updatedata;
83 newtimer->tm = tm_max;
86 insque(newtimer, &timer_head);
92 rtadvd_remove_timer(struct rtadvd_timer **timer)
100 rtadvd_set_timer(struct timeval *tm, struct rtadvd_timer *timer)
104 /* reset the timer */
105 gettimeofday(&now, NULL);
107 TIMEVAL_ADD(&now, tm, &timer->tm);
109 /* update the next expiration time */
110 if (TIMEVAL_LT(timer->tm, timer_head.tm))
111 timer_head.tm = timer->tm;
117 * Check expiration for each timer. If a timer expires,
118 * call the expire function for the timer and update the timer.
119 * Return the next interval for select() call.
124 static struct timeval returnval;
126 struct rtadvd_timer *tm = timer_head.next, *tm_next;
128 gettimeofday(&now, NULL);
130 timer_head.tm = tm_max;
132 for (tm = timer_head.next; tm != &timer_head; tm = tm_next) {
135 if (TIMEVAL_LEQ(tm->tm, now)) {
136 if (((*tm->expire)(tm->expire_data) == NULL))
137 continue; /* the timer was removed */
139 (*tm->update)(tm->update_data, &tm->tm);
140 TIMEVAL_ADD(&tm->tm, &now, &tm->tm);
143 if (TIMEVAL_LT(tm->tm, timer_head.tm))
144 timer_head.tm = tm->tm;
147 if (TIMEVAL_EQUAL(&tm_max, &timer_head.tm)) {
148 /* no need to timeout */
150 } else if (TIMEVAL_LT(timer_head.tm, now)) {
151 /* this may occur when the interval is too small */
152 returnval.tv_sec = returnval.tv_usec = 0;
154 TIMEVAL_SUB(&timer_head.tm, &now, &returnval);
159 rtadvd_timer_rest(struct rtadvd_timer *timer)
161 static struct timeval returnval, now;
163 gettimeofday(&now, NULL);
164 if (TIMEVAL_LEQ(timer->tm, now)) {
166 "<%s> a timer must be expired, but not yet",
168 returnval.tv_sec = returnval.tv_usec = 0;
171 TIMEVAL_SUB(&timer->tm, &now, &returnval);
178 TIMEVAL_ADD(struct timeval *a, struct timeval *b, struct timeval *result)
182 if ((l = a->tv_usec + b->tv_usec) < MILLION) {
184 result->tv_sec = a->tv_sec + b->tv_sec;
187 result->tv_usec = l - MILLION;
188 result->tv_sec = a->tv_sec + b->tv_sec + 1;
194 * XXX: this function assumes that a >= b.
197 TIMEVAL_SUB(struct timeval *a, struct timeval *b, struct timeval *result)
201 if ((l = a->tv_usec - b->tv_usec) >= 0) {
203 result->tv_sec = a->tv_sec - b->tv_sec;
206 result->tv_usec = MILLION + l;
207 result->tv_sec = a->tv_sec - b->tv_sec - 1;