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/* $OpenBSD: timer.c,v 1.2 1998/11/15 00:44:03 niklas Exp $ */
/*
* Copyright (c) 1998 Niklas Hallqvist. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Ericsson Radio Systems.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This code was written under funding by Ericsson Radio Systems.
*/
#include <sys/queue.h>
#include <stdlib.h>
#include <string.h>
#include "log.h"
#include "timer.h"
static TAILQ_HEAD (event_list, event) events;
void
timer_init ()
{
TAILQ_INIT (&events);
}
void
timer_next_event (struct timeval **timeout)
{
struct timeval now;
if (TAILQ_FIRST (&events))
{
gettimeofday (&now, 0);
if (timercmp (&now, &TAILQ_FIRST (&events)->expiration, >=))
timerclear (*timeout);
else
timersub (&TAILQ_FIRST (&events)->expiration, &now, *timeout);
}
else
*timeout = 0;
}
void
timer_handle_expirations ()
{
struct timeval now;
struct event *n;
gettimeofday (&now, 0);
for (n = TAILQ_FIRST (&events); n && timercmp (&now, &n->expiration, >=);
n = TAILQ_FIRST (&events))
{
log_debug (LOG_TIMER, 10,
"timer_handle_expirations: event %s(%p)", n->name, n->arg);
TAILQ_REMOVE (&events, n, link);
(*n->func) (n->arg);
free (n);
}
}
struct event *
timer_add_event (char *name, void (*func) (void *), void *arg,
struct timeval *expiration)
{
struct event *ev = (struct event *)malloc (sizeof *ev);
struct event *n;
if (!ev)
return 0;
ev->name = name;
ev->func = func;
ev->arg = arg;
memcpy (&ev->expiration, expiration, sizeof *expiration);
for (n = TAILQ_FIRST (&events);
n && timercmp (expiration, &n->expiration, >=);
n = TAILQ_NEXT (n, link))
;
if (n)
{
log_debug (LOG_TIMER, 10,
"timer_add_event: event %s(%p) added before %s(%p)", name,
arg, n->name, n->arg);
TAILQ_INSERT_BEFORE (n, ev, link);
}
else
{
log_debug (LOG_TIMER, 10, "timer_add_event: event %s(%p) added last",
name, arg);
TAILQ_INSERT_TAIL (&events, ev, link);
}
return ev;
}
void
timer_remove_event (struct event *ev)
{
log_debug (LOG_TIMER, 10, "timer_remove_event: removing event %s(%p)",
ev->name, ev->arg);
TAILQ_REMOVE (&events, ev, link);
free (ev);
}
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