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annotate src/timer/dc/SDL_systimer.c @ 1401:1819fd069e89

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author Sam Lantinga <slouken@libsdl.org>
date Tue, 21 Feb 2006 08:34:45 +0000
parents 19418e4422cb
children d910939febfa
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
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23 #include <kos.h>
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24
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25 #include "SDL_thread.h"
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26 #include "SDL_timer.h"
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27 #include "../SDL_timer_c.h"
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28
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29 static unsigned start;
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30
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31 /*
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32 jif = ms * HZ /1000
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33 ms = jif * 1000/HZ
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34 */
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35
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36 void SDL_StartTicks(void)
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37 {
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38 /* Set first ticks value */
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39 start = jiffies;
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40 }
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41
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42 Uint32 SDL_GetTicks(void)
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43 {
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44 return((jiffies-start)*1000/HZ);
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45 }
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46
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47 void SDL_Delay(Uint32 ms)
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48 {
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49 thd_sleep(ms);
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50 }
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51
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52 /* Data to handle a single periodic alarm */
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53 static int timer_alive = 0;
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54 static SDL_Thread *timer = NULL;
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55
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56 static int RunTimer(void *unused)
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57 {
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58 while ( timer_alive ) {
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59 if ( SDL_timer_running ) {
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60 SDL_ThreadedTimerCheck();
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61 }
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62 SDL_Delay(10);
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63 }
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64 return(0);
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65 }
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66
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67 /* This is only called if the event thread is not running */
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68 int SDL_SYS_TimerInit(void)
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69 {
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70 timer_alive = 1;
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71 timer = SDL_CreateThread(RunTimer, NULL);
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72 if ( timer == NULL )
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73 return(-1);
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74 return(SDL_SetTimerThreaded(1));
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75 }
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76
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77 void SDL_SYS_TimerQuit(void)
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78 {
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79 timer_alive = 0;
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80 if ( timer ) {
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81 SDL_WaitThread(timer, NULL);
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82 timer = NULL;
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83 }
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84 }
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85
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86 int SDL_SYS_StartTimer(void)
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87 {
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88 SDL_SetError("Internal logic error: DC uses threaded timer");
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89 return(-1);
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90 }
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91
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92 void SDL_SYS_StopTimer(void)
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93 {
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94 return;
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95 }