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      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 Lesser General Public
      7     License as published by the Free Software Foundation; either
      8     version 2.1 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     Lesser General Public License for more details.
     14 
     15     You should have received a copy of the GNU Lesser General Public
     16     License along with this library; if not, write to the Free Software
     17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
     18 
     19     Sam Lantinga
     20     slouken (at) libsdl.org
     21 */
     22 #include "SDL_config.h"
     23 
     24 #ifdef SDL_TIMER_BEOS
     25 
     26 #include <be/kernel/OS.h>
     27 
     28 #include "SDL_thread.h"
     29 #include "SDL_timer.h"
     30 #include "../SDL_timer_c.h"
     31 
     32 static bigtime_t start;
     33 
     34 void SDL_StartTicks(void)
     35 {
     36 	/* Set first ticks value */
     37 	start = system_time();
     38 }
     39 
     40 Uint32 SDL_GetTicks(void)
     41 {
     42 	return((system_time()-start)/1000);
     43 }
     44 
     45 void SDL_Delay(Uint32 ms)
     46 {
     47 	snooze(ms*1000);
     48 }
     49 
     50 /* Data to handle a single periodic alarm */
     51 static int timer_alive = 0;
     52 static SDL_Thread *timer = NULL;
     53 
     54 static int RunTimer(void *unused)
     55 {
     56 	while ( timer_alive ) {
     57 		if ( SDL_timer_running ) {
     58 			SDL_ThreadedTimerCheck();
     59 		}
     60 		SDL_Delay(10);
     61 	}
     62 	return(0);
     63 }
     64 
     65 /* This is only called if the event thread is not running */
     66 int SDL_SYS_TimerInit(void)
     67 {
     68 	timer_alive = 1;
     69 	timer = SDL_CreateThread(RunTimer, NULL);
     70 	if ( timer == NULL )
     71 		return(-1);
     72 	return(SDL_SetTimerThreaded(1));
     73 }
     74 
     75 void SDL_SYS_TimerQuit(void)
     76 {
     77 	timer_alive = 0;
     78 	if ( timer ) {
     79 		SDL_WaitThread(timer, NULL);
     80 		timer = NULL;
     81 	}
     82 }
     83 
     84 int SDL_SYS_StartTimer(void)
     85 {
     86 	SDL_SetError("Internal logic error: BeOS uses threaded timer");
     87 	return(-1);
     88 }
     89 
     90 void SDL_SYS_StopTimer(void)
     91 {
     92 	return;
     93 }
     94 
     95 #endif /* SDL_TIMER_BEOS */
     96