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/*
* Ivy, C interface
*
* Copyright (C) 1997-2000
* Centre d'Études de la Navigation Aérienne
*
* Timers used in select based main loop
*
* Authors: François-Régis Colin <fcolin@cena.fr>
*
* $Id$
*
* Please refer to file version.h for the
* copyright notice regarding this software
*/
/* Module de gestion des timers autour d'un select */
#include <stdio.h>
#include <sys/types.h>
#include <time.h>
#include <stdlib.h>
#include <memory.h>
#ifdef WIN32
#include <windows.h>
#else
#include <sys/time.h>
#endif
#include "list.h"
#include "timer.h"
#define BIGVALUE 2147483647
#define MILLISEC 1000
static struct timeval *timeoutptr = NULL;
static struct timeval selectTimeout = { BIGVALUE, 0 };
/* la prochaine echeance */
static unsigned long nextTimeout = BIGVALUE;
struct _timer {
struct _timer *next;
int repeat;
unsigned long period;
unsigned long when;
TimerCb callback;
void *user_data;
};
/* liste des timers */
TimerId timers = NULL;
static long currentTime()
{
unsigned long current;
#ifdef WIN32
current = GetTickCount();
#else
struct timeval stamp;
gettimeofday( &stamp, NULL );
current = stamp.tv_sec * MILLISEC + stamp.tv_usec/MILLISEC;
#endif
return current;
}
static void SetNewTimeout( unsigned long current, unsigned long when )
{
unsigned long time;
time = when - current;
nextTimeout = when;
selectTimeout.tv_sec = time / MILLISEC;
selectTimeout.tv_usec = (time - selectTimeout.tv_sec* MILLISEC) * MILLISEC;
if ( timeoutptr == NULL )
timeoutptr = &selectTimeout;
/*printf("New timeout %lu\n", time );*/
}
static void AdjTimeout(unsigned long current)
{
unsigned long newTimeout;
TimerId timer;
if ( timers )
{
/* recherche de la plus courte echeance dans la liste */
newTimeout = timers->when ; /* remise a la premiere valeur */
IVY_LIST_EACH( timers , timer )
{
if ( timer->when < newTimeout )
newTimeout = timer->when;
}
SetNewTimeout( current, newTimeout );
}
else
{
timeoutptr = NULL;
}
}
/* API */
TimerId TimerRepeatAfter( int count, long time, TimerCb cb, void *user_data )
{
unsigned long stamp;
TimerId timer;
/* si y a rien a faire et ben on fait rien */
if ( cb == NULL ) return NULL;
IVY_LIST_ADD( timers, timer )
if ( timer )
{
timer->repeat = count;
timer->callback = cb;
timer->user_data = user_data;
stamp = currentTime();
timer->period = time;
timer->when = stamp + time;
if ( (timer->when < nextTimeout) || (timeoutptr == NULL))
SetNewTimeout( stamp, timer->when );
}
return timer;
}
void TimerRemove( TimerId timer )
{
unsigned long stamp;
if ( !timer ) return;
IVY_LIST_REMOVE( timers, timer );
stamp = currentTime();
AdjTimeout(stamp);
}
void TimerModify( TimerId timer, long time )
{
unsigned long stamp;
if ( !timer ) return;
stamp = currentTime();
timer->period = time;
timer->when = stamp + time;
AdjTimeout(stamp);
}
/* Interface avec select */
struct timeval *TimerGetSmallestTimeout()
{
return timeoutptr;
}
void TimerScan()
{
unsigned long stamp;
TimerId timer;
TimerId next;
unsigned long delta;
int timer_echu = 0;
stamp = currentTime();
/* recherche des timers echu dans la liste */
IVY_LIST_EACH_SAFE( timers , timer, next )
{
if ( timer->when <= stamp )
{
timer_echu++;
delta = stamp - timer->when;
/* call callback */
(*timer->callback)( timer, timer->user_data, delta );
if ( timer->repeat == TIMER_LOOP || --(timer->repeat) )
{
timer->when = stamp + timer->period;
}
else
{
IVY_LIST_REMOVE( timers, timer );
}
}
}
/* recalcul du prochain timeout */
AdjTimeout( stamp );
}
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