141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/* $OpenBSD: timer.c,v 1.18 2017/12/05 20:31:45 jca Exp $ */
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/* $EOM: timer.c,v 1.13 2000/02/20 19:58:42 niklas Exp $ */
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/*
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* Copyright (c) 1998, 1999 Niklas Hallqvist. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This code was written under funding by Ericsson Radio Systems.
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*/
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#include <sys/queue.h>
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#include <sys/time.h>
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#include <stdlib.h>
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#include <string.h>
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#include "log.h"
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#include "timer.h"
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static TAILQ_HEAD(event_list, event) events;
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void
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timer_init(void)
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{
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TAILQ_INIT(&events);
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}
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void
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timer_next_event(struct timespec **timeout)
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{
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struct timespec now;
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if (TAILQ_FIRST(&events)) {
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clock_gettime(CLOCK_MONOTONIC, &now);
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if (timespeccmp(&now, &TAILQ_FIRST(&events)->expiration, >=))
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timespecclear(*timeout);
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else
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timespecsub(&TAILQ_FIRST(&events)->expiration, &now,
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*timeout);
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} else
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*timeout = 0;
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}
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void
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timer_handle_expirations(void)
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{
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struct timespec now;
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struct event *n;
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clock_gettime(CLOCK_MONOTONIC, &now);
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for (n = TAILQ_FIRST(&events);
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n && timespeccmp(&now, &n->expiration, >=);
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n = TAILQ_FIRST(&events)) {
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LOG_DBG((LOG_TIMER, 10,
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"timer_handle_expirations: event %s(%p)", n->name,
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n->arg));
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TAILQ_REMOVE(&events, n, link);
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(*n->func)(n->arg);
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free(n);
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}
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}
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struct event *
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timer_add_event(char *name, void (*func)(void *), void *arg,
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struct timespec *expiration)
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{
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struct event *ev = malloc(sizeof *ev);
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struct event *n;
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struct timespec now;
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if (!ev)
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return 0;
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ev->name = name;
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ev->func = func;
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ev->arg = arg;
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clock_gettime(CLOCK_MONOTONIC, &now);
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memcpy(&ev->expiration, expiration, sizeof *expiration);
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for (n = TAILQ_FIRST(&events);
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n && timespeccmp(expiration, &n->expiration, >=);
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n = TAILQ_NEXT(n, link))
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;
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if (n) {
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LOG_DBG((LOG_TIMER, 10,
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"timer_add_event: event %s(%p) added before %s(%p), "
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"expiration in %llds", name, arg, n->name, n->arg,
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(long long)(expiration->tv_sec - now.tv_sec)));
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TAILQ_INSERT_BEFORE(n, ev, link);
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} else {
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LOG_DBG((LOG_TIMER, 10, "timer_add_event: event %s(%p) added "
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"last, expiration in %ds", name, arg,
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(int)(expiration->tv_sec - now.tv_sec)));
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TAILQ_INSERT_TAIL(&events, ev, link);
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}
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return ev;
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}
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void
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timer_remove_event(struct event *ev)
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{
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LOG_DBG((LOG_TIMER, 10, "timer_remove_event: removing event %s(%p)",
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ev->name, ev->arg));
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TAILQ_REMOVE(&events, ev, link);
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free(ev);
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}
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void
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timer_report(void)
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{
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struct event *ev;
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struct timespec now;
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clock_gettime(CLOCK_MONOTONIC, &now);
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for (ev = TAILQ_FIRST(&events); ev; ev = TAILQ_NEXT(ev, link))
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LOG_DBG((LOG_REPORT, 0,
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"timer_report: event %s(%p) scheduled in %d seconds",
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(ev->name ? ev->name : "<unknown>"), ev,
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(int) (ev->expiration.tv_sec - now.tv_sec)));
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}
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