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SDL_systimer.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@devolution.com
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif
#include <stdio.h>
#include <sys/time.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "SDL_error.h"
#include "SDL_timer.h"
#include "SDL_timer_c.h"
/* The first ticks value of the application */
static struct timeval start;
void SDL_StartTicks(void)
{
/* Set first ticks value */
gettimeofday(&start, NULL);
}
Uint32 SDL_GetTicks (void)
{
struct timeval now;
Uint32 ticks;
gettimeofday(&now, NULL);
ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000;
return(ticks);
}
void SDL_Delay (Uint32 ms)
{
int was_error;
#ifndef linux /* Non-Linux implementations need to calculate time left */
Uint32 then, now, elapsed;
#endif
struct timeval tv;
/* Set the timeout interval - Linux only needs to do this once */
#ifdef linux
tv.tv_sec = ms/1000;
tv.tv_usec = (ms%1000)*1000;
#else
then = SDL_GetTicks();
#endif
do {
errno = 0;
#ifndef linux
/* Calculate the time interval left (in case of interrupt) */
now = SDL_GetTicks();
elapsed = (now-then);
then = now;
if ( elapsed >= ms ) {
break;
}
ms -= elapsed;
tv.tv_sec = ms/1000;
tv.tv_usec = (ms%1000)*1000;
#endif
was_error = select(0, NULL, NULL, NULL, &tv);
} while ( was_error && (errno == EINTR) );
}
#include "SDL_thread.h"
/* Data to handle a single periodic alarm */
static int timer_alive = 0;
static SDL_Thread *timer = NULL;
static int RunTimer(void *unused)
{
while ( timer_alive ) {
if ( SDL_timer_running ) {
SDL_ThreadedTimerCheck();
}
SDL_Delay(1);
}
return(0);
}
/* This is only called if the event thread is not running */
int SDL_SYS_TimerInit(void)
{
#ifdef NO_AMIGADEBUG
fprintf(stderr,"Creo il thread per il timer (NOITMER)...\n");
#endif
timer_alive = 1;
timer = SDL_CreateThread(RunTimer, NULL);
if ( timer == NULL )
{
#ifdef NO_AMIGADEBUG
fprintf(stderr,"Creazione del thread fallita...\n");
#endif
return(-1);
}
return(SDL_SetTimerThreaded(1));
}
void SDL_SYS_TimerQuit(void)
{
timer_alive = 0;
if ( timer ) {
SDL_WaitThread(timer, NULL);
timer = NULL;
}
}
int SDL_SYS_StartTimer(void)
{
SDL_SetError("Internal logic error: Linux uses threaded timer");
return(-1);
}
void SDL_SYS_StopTimer(void)
{
return;
}