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annotate src/timer/dc/SDL_systimer.c @ 1440:ae78374ac894

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Passing a NULL GL library does the right thing nowadays.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 26 Feb 2006 13:40:26 +0000
parents d910939febfa
children 92947e3a18db
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include <kos.h>
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25
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26 #include "SDL_thread.h"
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27 #include "SDL_timer.h"
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28 #include "../SDL_timer_c.h"
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29
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30 static unsigned start;
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31
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32 /*
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33 jif = ms * HZ /1000
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34 ms = jif * 1000/HZ
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35 */
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36
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37 void SDL_StartTicks(void)
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38 {
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39 /* Set first ticks value */
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40 start = jiffies;
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41 }
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42
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43 Uint32 SDL_GetTicks(void)
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44 {
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45 return((jiffies-start)*1000/HZ);
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46 }
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47
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48 void SDL_Delay(Uint32 ms)
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49 {
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50 thd_sleep(ms);
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51 }
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52
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53 /* Data to handle a single periodic alarm */
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54 static int timer_alive = 0;
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55 static SDL_Thread *timer = NULL;
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56
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57 static int RunTimer(void *unused)
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58 {
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59 while ( timer_alive ) {
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60 if ( SDL_timer_running ) {
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61 SDL_ThreadedTimerCheck();
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62 }
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63 SDL_Delay(10);
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64 }
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65 return(0);
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66 }
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67
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68 /* This is only called if the event thread is not running */
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69 int SDL_SYS_TimerInit(void)
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70 {
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71 timer_alive = 1;
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72 timer = SDL_CreateThread(RunTimer, NULL);
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73 if ( timer == NULL )
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74 return(-1);
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75 return(SDL_SetTimerThreaded(1));
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76 }
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77
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78 void SDL_SYS_TimerQuit(void)
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79 {
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80 timer_alive = 0;
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81 if ( timer ) {
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82 SDL_WaitThread(timer, NULL);
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83 timer = NULL;
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84 }
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85 }
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86
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87 int SDL_SYS_StartTimer(void)
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88 {
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89 SDL_SetError("Internal logic error: DC uses threaded timer");
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90 return(-1);
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91 }
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92
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93 void SDL_SYS_StopTimer(void)
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94 {
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95 return;
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96 }