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annotate src/timer/dc/SDL_systimer.c @ 769:b8d311d90021

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Updated copyright information for 2004 (Happy New Year!)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 16:49:27 +0000
parents dad72daf44b3
children c9b51268668f
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga
509
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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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 BERO
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20 bero@geocities.co.jp
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21
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22 based on win32/SDL_systimer.c
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23
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24 Sam Lantinga
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25 slouken@libsdl.org
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26 */
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27
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28 #ifdef SAVE_RCSID
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29 static char rcsid =
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30 "@(#) $Id$";
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31 #endif
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32
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33 #include <kos.h>
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34
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35 #include "SDL_thread.h"
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36 #include "SDL_timer.h"
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37 #include "SDL_error.h"
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38 #include "SDL_timer_c.h"
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39
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40 static unsigned start;
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41
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42 /*
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43 jif = ms * HZ /1000
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44 ms = jif * 1000/HZ
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45 */
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46
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47 void SDL_StartTicks(void)
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48 {
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49 /* Set first ticks value */
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50 start = jiffies;
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51 }
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52
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53 Uint32 SDL_GetTicks(void)
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54 {
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55 return((jiffies-start)*1000/HZ);
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56 }
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57
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58 void SDL_Delay(Uint32 ms)
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59 {
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60 thd_sleep(ms);
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61 }
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62
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63 /* Data to handle a single periodic alarm */
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64 static int timer_alive = 0;
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65 static SDL_Thread *timer = NULL;
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66
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67 static int RunTimer(void *unused)
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68 {
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69 while ( timer_alive ) {
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70 if ( SDL_timer_running ) {
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71 SDL_ThreadedTimerCheck();
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72 }
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73 SDL_Delay(10);
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74 }
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75 return(0);
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76 }
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77
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78 /* This is only called if the event thread is not running */
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79 int SDL_SYS_TimerInit(void)
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80 {
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81 timer_alive = 1;
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82 timer = SDL_CreateThread(RunTimer, NULL);
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83 if ( timer == NULL )
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84 return(-1);
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85 return(SDL_SetTimerThreaded(1));
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86 }
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87
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88 void SDL_SYS_TimerQuit(void)
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89 {
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90 timer_alive = 0;
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91 if ( timer ) {
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92 SDL_WaitThread(timer, NULL);
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93 timer = NULL;
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94 }
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95 }
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96
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97 int SDL_SYS_StartTimer(void)
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98 {
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99 SDL_SetError("Internal logic error: DC uses threaded timer");
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100 return(-1);
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101 }
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102
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103 void SDL_SYS_StopTimer(void)
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104 {
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105 return;
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106 }