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annotate src/timer/dc/SDL_systimer.c @ 1180:bdcb8bb4c831

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From: Tyler Montbriand <tsm@accesscomm.ca> To: sdl@libsdl.org Date: Fri, 30 Sep 2005 02:24:50 -0600 Subject: [SDL] WinCE timers, continued Here's a strange timer for Windows CE that doesn't ignore time across suspends. It uses GetSystemTime to keep the time continuous, and GetTicks to get finer-grained readings than 1 second. It detects the difference between the GetTicks time and GetSystemTime time on power-on to keep the error within one second max. It's not a patch on the current win32 timer code -- took one look at that and figured it had more than enough #ifdefs already. It's windows-ce specific. Another thing I've noticed is that the Windows CE 4.0 and newer API has functions warn processes about suspends. This is something SDL REALLY needs for audio in particular, because turning it off while it's playing causes anything that uses audio to hardlock the system on power-on. Unfortunately I don't have 4.0 to play with. :(
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 22 Nov 2005 07:10:07 +0000
parents b8d311d90021
children c9b51268668f
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1 /*
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2 SDL - Simple DirectMedia Layer
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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 }