src/timer/epoc/SDL_systimer.cpp
author Sam Lantinga <slouken@libsdl.org>
Mon, 29 May 2006 04:04:35 +0000
branchSDL-1.3
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#ifdef SDL_TIMER_EPOC
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/*
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    SDL_systimer.cpp
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    Epoc version by Hannu Viitala (hannu.j.viitala@mbnet.fi)
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*/
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#include <e32std.h>
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#include <e32hal.h>
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extern "C" {
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#include "SDL_error.h"
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#include "SDL_thread.h"
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#include "SDL_timer.h"
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#include "../SDL_timer_c.h"
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static TUint start = 0;
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static TInt tickPeriodMilliSeconds;
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void SDL_StartTicks(void)
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{
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	/* Set first ticks value */
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    start = User::TickCount();
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    TTimeIntervalMicroSeconds32 period;
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	TInt tmp = UserHal::TickPeriod(period);
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    tickPeriodMilliSeconds = period.Int() / 1000;
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}
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Uint32 SDL_GetTicks(void)
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{
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    TUint deltaTics = User::TickCount() - start;
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	return(deltaTics * tickPeriodMilliSeconds); 
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}
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void SDL_Delay(Uint32 ms)
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{
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    User::After(TTimeIntervalMicroSeconds32(ms*1000));
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}
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/* Data to handle a single periodic alarm */
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static int timer_alive = 0;
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static SDL_Thread *timer = NULL;
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static int RunTimer(void *unused)
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{
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	Uint32 ms;
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	while ( timer_alive ) {
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		if ( SDL_timer_running ) {
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			SDL_ThreadedTimerCheck();
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		}
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		SDL_Delay(10);
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	}
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	return(0);
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}
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/* This is only called if the event thread is not running */
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int SDL_SYS_TimerInit(void)
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{
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	timer_alive = 1;
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	timer = SDL_CreateThread(RunTimer, NULL);
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	if ( timer == NULL )
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		return(-1);
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	return(SDL_SetTimerThreaded(1));
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}
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void SDL_SYS_TimerQuit(void)
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{
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	timer_alive = 0;
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	if ( timer ) {
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		SDL_WaitThread(timer, NULL);
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		timer = NULL;
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	}
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}
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int SDL_SYS_StartTimer(void)
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{
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	SDL_SetError("Internal logic error: Epoc uses threaded timer");
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	return(-1);
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}
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void SDL_SYS_StopTimer(void)
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{
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	return;
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}
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}; // extern "C"
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#endif /* SDL_TIMER_EPOC */