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/* $Id: timer.c,v 1.2 2004/01/18 09:01:45 reinelt Exp $
*
* generic timer handling
*
* Copyright 2003,2004 Michael Reinelt <reinelt@eunet.at>
* Copyright 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.
*
*
* $Log: timer.c,v $
* Revision 1.2 2004/01/18 09:01:45 reinelt
* /proc/stat parsing finished
*
* Revision 1.1 2004/01/13 08:18:20 reinelt
* timer queues added
* liblcd4linux deactivated turing transformation to new layout
*
*/
/*
* exported functions:
*
* int timer_junk(void)
* Fixme: document me :-(
*
*/
#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"
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, 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, int interval, int one_shot)
{
int i;
struct timeval now;
gettimeofday(&now, NULL);
// 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));
}
// 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;
return 0;
}
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