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SDL_systimer.c
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SDL_systimer.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2009 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#ifdef SDL_TIMER_DC
#include <kos.h>
#include "SDL_thread.h"
#include "SDL_timer.h"
#include "../SDL_timer_c.h"
static unsigned start;
/*
jif = ms * HZ /1000
ms = jif * 1000/HZ
*/
void
SDL_StartTicks(void)
{
/* Set first ticks value */
start = jiffies;
}
Uint32
SDL_GetTicks(void)
{
return ((jiffies - start) * 1000 / HZ);
}
void
SDL_Delay(Uint32 ms)
{
thd_sleep(ms);
}
/* 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(10);
}
return (0);
}
/* This is only called if the event thread is not running */
int
SDL_SYS_TimerInit(void)
{
timer_alive = 1;
timer = SDL_CreateThread(RunTimer, NULL);
if (timer == NULL)
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: DC uses threaded timer");
return (-1);
}
void
SDL_SYS_StopTimer(void)
{
return;
}
#endif /* SDL_TIMER_DC */
/* vi: set ts=4 sw=4 expandtab: */