1 /* $OpenBSD: timer.c,v 1.15 2005/04/08 22:32:10 cloder Exp $ */ 2 /* $EOM: timer.c,v 1.13 2000/02/20 19:58:42 niklas Exp $ */ 3 4 /* 5 * Copyright (c) 1998, 1999 Niklas Hallqvist. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 /* 29 * This code was written under funding by Ericsson Radio Systems. 30 */ 31 32 #include <sys/queue.h> 33 #include <stdlib.h> 34 #include <string.h> 35 36 #include "log.h" 37 #include "timer.h" 38 39 static TAILQ_HEAD(event_list, event) events; 40 41 void 42 timer_init(void) 43 { 44 TAILQ_INIT(&events); 45 } 46 47 void 48 timer_next_event(struct timeval **timeout) 49 { 50 struct timeval now; 51 52 if (TAILQ_FIRST(&events)) { 53 gettimeofday(&now, 0); 54 if (timercmp(&now, &TAILQ_FIRST(&events)->expiration, >=)) 55 timerclear(*timeout); 56 else 57 timersub(&TAILQ_FIRST(&events)->expiration, &now, 58 *timeout); 59 } else 60 *timeout = 0; 61 } 62 63 void 64 timer_handle_expirations(void) 65 { 66 struct timeval now; 67 struct event *n; 68 69 gettimeofday(&now, 0); 70 for (n = TAILQ_FIRST(&events); n && timercmp(&now, &n->expiration, >=); 71 n = TAILQ_FIRST(&events)) { 72 LOG_DBG((LOG_TIMER, 10, 73 "timer_handle_expirations: event %s(%p)", n->name, 74 n->arg)); 75 TAILQ_REMOVE(&events, n, link); 76 (*n->func)(n->arg); 77 free(n); 78 } 79 } 80 81 struct event * 82 timer_add_event(char *name, void (*func)(void *), void *arg, 83 struct timeval *expiration) 84 { 85 struct event *ev = (struct event *) malloc(sizeof *ev); 86 struct event *n; 87 struct timeval now; 88 89 if (!ev) 90 return 0; 91 ev->name = name; 92 ev->func = func; 93 ev->arg = arg; 94 gettimeofday(&now, 0); 95 memcpy(&ev->expiration, expiration, sizeof *expiration); 96 for (n = TAILQ_FIRST(&events); 97 n && timercmp(expiration, &n->expiration, >=); 98 n = TAILQ_NEXT(n, link)) 99 ; 100 if (n) { 101 LOG_DBG((LOG_TIMER, 10, 102 "timer_add_event: event %s(%p) added before %s(%p), " 103 "expiration in %lds", name, 104 arg, n->name, n->arg, expiration->tv_sec - now.tv_sec)); 105 TAILQ_INSERT_BEFORE(n, ev, link); 106 } else { 107 LOG_DBG((LOG_TIMER, 10, "timer_add_event: event %s(%p) added " 108 "last, expiration in %lds", name, arg, 109 expiration->tv_sec - now.tv_sec)); 110 TAILQ_INSERT_TAIL(&events, ev, link); 111 } 112 return ev; 113 } 114 115 void 116 timer_remove_event(struct event *ev) 117 { 118 LOG_DBG((LOG_TIMER, 10, "timer_remove_event: removing event %s(%p)", 119 ev->name, ev->arg)); 120 TAILQ_REMOVE(&events, ev, link); 121 free(ev); 122 } 123 124 void 125 timer_report(void) 126 { 127 struct event *ev; 128 struct timeval now; 129 130 gettimeofday(&now, 0); 131 132 for (ev = TAILQ_FIRST(&events); ev; ev = TAILQ_NEXT(ev, link)) 133 LOG_DBG((LOG_REPORT, 0, 134 "timer_report: event %s(%p) scheduled in %d seconds", 135 (ev->name ? ev->name : "<unknown>"), ev, 136 (int) (ev->expiration.tv_sec - now.tv_sec))); 137 } 138