2 /* $KAME: timer.c,v 1.4 2000/05/27 11:30:43 jinmei 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
39 #if defined(__NetBSD__) || defined(__OpenBSD__)
44 static struct rtadvd_timer timer_head;
46 #define MILLION 1000000
47 #define TIMEVAL_EQUAL(t1,t2) ((t1)->tv_sec == (t2)->tv_sec &&\
48 (t1)->tv_usec == (t2)->tv_usec)
50 static struct timeval tm_max = {0x7fffffff, 0x7fffffff};
55 memset(&timer_head, 0, sizeof(timer_head));
57 timer_head.next = timer_head.prev = &timer_head;
58 timer_head.tm = tm_max;
62 rtadvd_add_timer(struct rtadvd_timer *(*timeout) __P((void *)),
63 void (*update) __P((void *, struct timeval *)),
64 void *timeodata, void *updatedata)
66 struct rtadvd_timer *newtimer;
68 if ((newtimer = malloc(sizeof(*newtimer))) == NULL) {
70 "<%s> can't allocate memory", __FUNCTION__);
74 memset(newtimer, 0, sizeof(*newtimer));
76 if (timeout == NULL) {
78 "<%s> timeout function unspecfied", __FUNCTION__);
81 newtimer->expire = timeout;
82 newtimer->update = update;
83 newtimer->expire_data = timeodata;
84 newtimer->update_data = updatedata;
85 newtimer->tm = tm_max;
88 insque(newtimer, &timer_head);
94 rtadvd_remove_timer(struct rtadvd_timer **timer)
102 rtadvd_set_timer(struct timeval *tm, struct rtadvd_timer *timer)
106 /* reset the timer */
107 gettimeofday(&now, NULL);
109 TIMEVAL_ADD(&now, tm, &timer->tm);
111 /* update the next expiration time */
112 if (TIMEVAL_LT(timer->tm, timer_head.tm))
113 timer_head.tm = timer->tm;
119 * Check expiration for each timer. If a timer expires,
120 * call the expire function for the timer and update the timer.
121 * Return the next interval for select() call.
126 static struct timeval returnval;
128 struct rtadvd_timer *tm = timer_head.next, *tm_next;
130 gettimeofday(&now, NULL);
132 timer_head.tm = tm_max;
134 for (tm = timer_head.next; tm != &timer_head; tm = tm_next) {
137 if (TIMEVAL_LEQ(tm->tm, now)) {
138 if (((*tm->expire)(tm->expire_data) == NULL))
139 continue; /* the timer was removed */
141 (*tm->update)(tm->update_data, &tm->tm);
142 TIMEVAL_ADD(&tm->tm, &now, &tm->tm);
145 if (TIMEVAL_LT(tm->tm, timer_head.tm))
146 timer_head.tm = tm->tm;
149 if (TIMEVAL_EQUAL(&tm_max, &timer_head.tm)) {
150 /* no need to timeout */
153 else if (TIMEVAL_LT(timer_head.tm, now)) {
154 /* this may occur when the interval is too small */
155 returnval.tv_sec = returnval.tv_usec = 0;
158 TIMEVAL_SUB(&timer_head.tm, &now, &returnval);
163 rtadvd_timer_rest(struct rtadvd_timer *timer)
165 static struct timeval returnval, now;
167 gettimeofday(&now, NULL);
168 if (TIMEVAL_LEQ(timer->tm, now)) {
170 "<%s> a timer must be expired, but not yet",
172 returnval.tv_sec = returnval.tv_usec = 0;
175 TIMEVAL_SUB(&timer->tm, &now, &returnval);
182 TIMEVAL_ADD(struct timeval *a, struct timeval *b, struct timeval *result)
186 if ((l = a->tv_usec + b->tv_usec) < MILLION) {
188 result->tv_sec = a->tv_sec + b->tv_sec;
191 result->tv_usec = l - MILLION;
192 result->tv_sec = a->tv_sec + b->tv_sec + 1;
198 * XXX: this function assumes that a >= b.
201 TIMEVAL_SUB(struct timeval *a, struct timeval *b, struct timeval *result)
205 if ((l = a->tv_usec - b->tv_usec) >= 0) {
207 result->tv_sec = a->tv_sec - b->tv_sec;
210 result->tv_usec = MILLION + l;
211 result->tv_sec = a->tv_sec - b->tv_sec - 1;