Mercurial > sdl-ios-xcode

annotate src/timer/dc/SDL_systimer.c @ 3784:37c9c4590689 SDL-ryan-multiple-audio-device

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First batch of heavy lifting on supporting multiple audio devices at once. This has a long way to go yet, most of the drivers aren't updated for the new interfaces, and it's still got some obvious bugs, FIXMEs, and wistlist items. Don't use yet.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 01 Oct 2006 05:24:03 +0000
parents c121d94672cb
children 99210400e8b9
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 #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
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40 SDL_StartTicks(void)
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41 {
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42 /* Set first ticks value */
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43 start = jiffies;
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44 }
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45
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46 Uint32
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47 SDL_GetTicks(void)
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48 {
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49 return ((jiffies - start) * 1000 / HZ);
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50 }
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51
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52 void
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53 SDL_Delay(Uint32 ms)
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54 {
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55 thd_sleep(ms);
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56 }
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57
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58 /* Data to handle a single periodic alarm */
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59 static int timer_alive = 0;
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60 static SDL_Thread *timer = NULL;
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61
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62 static int
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63 RunTimer(void *unused)
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64 {
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65 while (timer_alive) {
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66 if (SDL_timer_running) {
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67 SDL_ThreadedTimerCheck();
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68 }
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69 SDL_Delay(10);
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70 }
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71 return (0);
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72 }
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73
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74 /* This is only called if the event thread is not running */
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75 int
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76 SDL_SYS_TimerInit(void)
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77 {
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78 timer_alive = 1;
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79 timer = SDL_CreateThread(RunTimer, NULL);
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80 if (timer == NULL)
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81 return (-1);
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82 return (SDL_SetTimerThreaded(1));
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83 }
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84
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85 void
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86 SDL_SYS_TimerQuit(void)
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87 {
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88 timer_alive = 0;
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89 if (timer) {
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90 SDL_WaitThread(timer, NULL);
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91 timer = NULL;
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92 }
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93 }
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94
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95 int
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96 SDL_SYS_StartTimer(void)
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97 {
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98 SDL_SetError("Internal logic error: DC uses threaded timer");
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99 return (-1);
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100 }
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101
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102 void
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103 SDL_SYS_StopTimer(void)
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104 {
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105 return;
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106 }
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107
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108 #endif /* SDL_TIMER_DC */
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109 /* vi: set ts=4 sw=4 expandtab: */