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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 #ifdef SDL_TIMER_DC |
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25 |
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26 #include <kos.h> |
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27 |
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28 #include "SDL_thread.h" |
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29 #include "SDL_timer.h" |
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30 #include "../SDL_timer_c.h" |
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31 |
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32 static unsigned start; |
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33 |
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34 /* |
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35 jif = ms * HZ /1000 |
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36 ms = jif * 1000/HZ |
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37 */ |
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38 |
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39 void SDL_StartTicks(void) |
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40 { |
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41 /* Set first ticks value */ |
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42 start = jiffies; |
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43 } |
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44 |
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45 Uint32 SDL_GetTicks(void) |
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46 { |
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47 return((jiffies-start)*1000/HZ); |
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48 } |
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49 |
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50 void SDL_Delay(Uint32 ms) |
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51 { |
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52 thd_sleep(ms); |
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53 } |
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54 |
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55 /* Data to handle a single periodic alarm */ |
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56 static int timer_alive = 0; |
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57 static SDL_Thread *timer = NULL; |
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58 |
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59 static int RunTimer(void *unused) |
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60 { |
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61 while ( timer_alive ) { |
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62 if ( SDL_timer_running ) { |
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63 SDL_ThreadedTimerCheck(); |
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64 } |
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65 SDL_Delay(10); |
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66 } |
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67 return(0); |
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68 } |
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69 |
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70 /* This is only called if the event thread is not running */ |
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71 int SDL_SYS_TimerInit(void) |
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72 { |
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73 timer_alive = 1; |
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74 timer = SDL_CreateThread(RunTimer, NULL); |
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75 if ( timer == NULL ) |
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76 return(-1); |
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77 return(SDL_SetTimerThreaded(1)); |
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78 } |
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79 |
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80 void SDL_SYS_TimerQuit(void) |
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81 { |
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82 timer_alive = 0; |
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83 if ( timer ) { |
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84 SDL_WaitThread(timer, NULL); |
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85 timer = NULL; |
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86 } |
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87 } |
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88 |
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89 int SDL_SYS_StartTimer(void) |
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90 { |
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91 SDL_SetError("Internal logic error: DC uses threaded timer"); |
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92 return(-1); |
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93 } |
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94 |
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95 void SDL_SYS_StopTimer(void) |
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96 { |
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97 return; |
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98 } |
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99 |
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100 #endif /* SDL_TIMER_DC */ |