Home | History | Annotate | Download | only in symbian 
      1 /*
      2     SDL - Simple DirectMedia Layer
      3     Copyright (C) 1997-2012 Sam Lantinga
      4 
      5     This library is free software; you can redistribute it and/or
      6     modify it under the terms of the GNU Library General Public
      7     License as published by the Free Software Foundation; either
      8     version 2 of the License, or (at your option) any later version.
      9 
     10     This library is distributed in the hope that it will be useful,
     11     but WITHOUT ANY WARRANTY; without even the implied warranty of
     12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13     Library General Public License for more details.
     14 
     15     You should have received a copy of the GNU Library General Public
     16     License along with this library; if not, write to the Free
     17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
     18 
     19     Sam Lantinga
     20     slouken (at) devolution.com
     21 */
     22 
     23 /*
     24     SDL_systimer.cpp
     25 
     26     Epoc version by Hannu Viitala (hannu.j.viitala (at) mbnet.fi)
     27     Markus Mertama
     28 */
     29 
     30 #include <e32std.h>
     31 #include <e32hal.h>
     32 
     33 extern "C" {
     34 #include "SDL_error.h"
     35 #include "SDL_thread.h"
     36 #include "SDL_timer.h"
     37 #include "SDL_timer_c.h"
     38 
     39 static TUint start = 0;
     40 static TInt tickPeriodMilliSeconds;
     41 
     42 
     43 void SDL_StartTicks(void)
     44 	{
     45 	/* Set first ticks value */
     46     start = User::TickCount();
     47 
     48     TTimeIntervalMicroSeconds32 period;
     49 	TInt tmp = UserHal::TickPeriod(period);
     50     tickPeriodMilliSeconds = period.Int() / 1000;
     51 	}
     52 
     53 Uint32 SDL_GetTicks(void)
     54 	{
     55     TUint deltaTics = User::TickCount() - start;
     56 	return(deltaTics * tickPeriodMilliSeconds);
     57 	}
     58 
     59 void SDL_Delay(Uint32 ms)
     60 	{
     61     User::After(TTimeIntervalMicroSeconds32(ms*1000));
     62 	}
     63 
     64 /* Data to handle a single periodic alarm */
     65 static int timer_alive = 0;
     66 static SDL_Thread *timer = NULL;
     67 
     68 static int RunTimer(void *unused)
     69 	{
     70 	while ( timer_alive )
     71 		{
     72 		if (SDL_timer_running)
     73 			{
     74 			SDL_ThreadedTimerCheck();
     75 			}
     76 		SDL_Delay(10);
     77 		}
     78 	return(0);
     79 	}
     80 
     81 /* This is only called if the event thread is not running */
     82 int SDL_SYS_TimerInit(void)
     83 	{
     84 	if(timer != NULL)
     85 		return (-1);
     86 	timer_alive = 1;
     87 	timer = SDL_CreateThread(RunTimer, NULL);
     88 	if ( timer == NULL )
     89 		return(-1);
     90 	return(SDL_SetTimerThreaded(1));
     91 	}
     92 
     93 void SDL_SYS_TimerQuit(void)
     94 	{
     95 	timer_alive = 0;
     96 	if ( timer )
     97 		{
     98 		SDL_WaitThread(timer, NULL);
     99 		timer = NULL;
    100 		}
    101 	}
    102 
    103 int SDL_SYS_StartTimer(void)
    104 	{
    105 	SDL_SetError("Internal logic error: Epoc uses threaded timer");
    106 	return(-1);
    107 	}
    108 
    109 void SDL_SYS_StopTimer(void)
    110 	{
    111 	return;
    112 	}
    113 
    114 } // extern "C"
    115