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/* $Id$
* $URL$
*
* generic timer handling
*
* Copyright (C) 2003, 2004 Michael Reinelt <michael@reinelt.co.at>
* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* exported functions:
*
* int timer_add (void(*callback)(void *data), void *data, int interval, int one_shot);
* adds a timer to the queue
*
* int timer_process (struct timespec *delay);
* process timer queue
*
* void timer_exit();
* release all timers
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <time.h>
#include "debug.h"
#include "cfg.h"
#include "timer.h"
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif
#define CLOCK_SKEW_DETECT_TIME_IN_S 1
typedef struct TIMER {
void (*callback) (void *data);
void *data;
struct timeval when;
int interval;
int one_shot;
int active;
} TIMER;
TIMER *Timers = NULL;
int nTimers = 0;
static void timer_inc(struct timeval *tv, const int msec)
{
tv->tv_sec += msec / 1000;
tv->tv_usec += (msec - 1000 * (msec / 1000)) * 1000;
if (tv->tv_usec >= 1000000) {
tv->tv_usec -= 1000000;
tv->tv_sec++;
}
}
int timer_add(void (*callback) (void *data), void *data, const int interval, const int one_shot)
{
int i;
struct timeval now;
/* find a free slot */
for (i = 0; i < nTimers; i++) {
if (Timers[i].active == 0)
break;
}
/* none found, allocate a new slot */
if (i >= nTimers) {
nTimers++;
Timers = realloc(Timers, nTimers * sizeof(*Timers));
}
gettimeofday(&now, NULL);
/* fill slot */
Timers[i].callback = callback;
Timers[i].data = data;
Timers[i].when = now;
Timers[i].interval = interval;
Timers[i].one_shot = one_shot;
Timers[i].active = 1;
/* if one-shot timer, don't fire now */
if (one_shot) {
timer_inc(&Timers[i].when, interval);
}
return 0;
}
int timer_process(struct timespec *delay)
{
int i, flag, min;
struct timeval now;
/* the current moment */
gettimeofday(&now, NULL);
/* sanity check */
if (nTimers == 0) {
error("huh? not one single timer to process? dazed and confused...");
return -1;
}
/* process expired timers */
flag = 0;
for (i = 0; i < nTimers; i++) {
if (Timers[i].active == 0)
continue;
if (timercmp(&Timers[i].when, &now, <=)) {
flag = 1;
/* callback */
if (Timers[i].callback != NULL) {
Timers[i].callback(Timers[i].data);
}
/* respawn or delete timer */
if (Timers[i].one_shot) {
Timers[i].active = 0;
} else {
Timers[i].when = now;
timer_inc(&Timers[i].when, Timers[i].interval);
}
}
}
/* find next timer */
flag = 1;
min = -1;
for (i = 0; i < nTimers; i++) {
if (Timers[i].active == 0)
continue;
if (flag || timercmp(&Timers[i].when, &Timers[min].when, <)) {
flag = 0;
min = i;
}
}
if (min < 0) {
error("huh? not one single timer left? dazed and confused...");
return -1;
}
/* delay until next timer event */
delay->tv_sec = Timers[min].when.tv_sec - now.tv_sec;
delay->tv_nsec = Timers[min].when.tv_usec - now.tv_usec;
if (delay->tv_nsec < 0) {
delay->tv_sec--;
delay->tv_nsec += 1000000;
}
/* nanoseconds!! */
delay->tv_nsec *= 1000;
/* check if date changed */
if ((delay->tv_sec) > CLOCK_SKEW_DETECT_TIME_IN_S) {
delay->tv_sec = 0;
delay->tv_nsec = 0;
warn("Oops, clock skewed, update timestamp");
gettimeofday(&now, NULL);
Timers[min].when = now;
}
return 0;
}
void timer_exit(void)
{
nTimers = 0;
if (Timers != NULL) {
free(Timers);;
Timers = NULL;
}
}
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