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annotate src/timer/mint/SDL_systimer.c @ 1143:71a2648acc75

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Replaced Mac OS X's C++ cdrom code with almost-direct translation to C. Sam requested this effort on the mailing list, apparently because of binary compatibility issues between 10.4 and earlier systems (or gcc4 and earlier compilers?). Works fine with SDL12/test/testcdrom.c, with this command line: ./testcdrom -status -list -play -sleep 5000 -pause -sleep 3000 -resume \ -sleep 5000 -stop -sleep 3000 -play -sleep 3000 -stop \ -sleep 3000 -eject Unix Makefiles work, XCode project still need updating for new filenames.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 22 Sep 2005 08:48:16 +0000
parents 63b8e93a3a52
children c9b51268668f
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 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 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 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /*
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29 * TOS/MiNT timer driver
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30 * based on vbl vector
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31 *
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32 * Patrice Mandin
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33 */
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34
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35 #include <stdio.h>
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36 #include <sys/time.h>
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37 #include <signal.h>
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38 #include <unistd.h>
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39 #include <string.h>
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40 #include <errno.h>
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41
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42 #include <mint/cookie.h>
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43 #include <mint/sysvars.h>
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44 #include <mint/osbind.h>
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45 #include <mint/mintbind.h>
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46
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47 #include "SDL_error.h"
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48 #include "SDL_timer.h"
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49 #include "SDL_timer_c.h"
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50 #include "SDL_thread.h"
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51
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52 #include "mint/SDL_vbltimer_s.h"
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53
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54 /* The first ticks value of the application */
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55 static Uint32 start;
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56 static SDL_bool supervisor;
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57 static int mint_present; /* can we use Syield() ? */
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58
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59 void SDL_StartTicks(void)
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60 {
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61 void *oldpile;
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62 unsigned long dummy;
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63
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64 /* Set first ticks value */
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65 oldpile=(void *)Super(0);
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66 start=*((volatile long *)_hz_200);
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67 Super(oldpile);
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68
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69 start *= 5; /* One _hz_200 tic is 5ms */
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70
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71 mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
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72 }
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73
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74 Uint32 SDL_GetTicks (void)
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75 {
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76 Uint32 now;
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77 void *oldpile=NULL;
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78
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79 /* Check if we are in supervisor mode
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80 (this is the case when called from SDL_ThreadedTimerCheck,
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81 which is called from RunTimer, running in the vbl vector)
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82 */
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83 if (!supervisor) {
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84 oldpile=(void *)Super(0);
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85 }
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86
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87 now=*((volatile long *)_hz_200);
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88
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89 if (!supervisor) {
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90 Super(oldpile);
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91 }
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92
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93 return((now*5)-start);
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94 }
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95
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96 void SDL_Delay (Uint32 ms)
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97 {
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98 Uint32 now;
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99
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100 now = SDL_GetTicks();
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101 while ((SDL_GetTicks()-now)<ms){
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102 if (mint_present) {
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103 Syield();
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104 }
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105 }
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106 }
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107
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108 /* Data to handle a single periodic alarm */
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109 static SDL_bool timer_installed=SDL_FALSE;
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110
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111 static void RunTimer(void)
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112 {
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113 supervisor=SDL_TRUE;
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114 SDL_ThreadedTimerCheck();
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115 supervisor=SDL_FALSE;
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116 }
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117
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118 /* This is only called if the event thread is not running */
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119 int SDL_SYS_TimerInit(void)
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120 {
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121 void *oldpile;
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122
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123 supervisor=SDL_FALSE;
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124
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125 /* Install RunTimer in vbl vector */
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126 oldpile=(void *)Super(0);
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127 timer_installed = !SDL_AtariVblInstall(RunTimer);
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128 Super(oldpile);
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129
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130 if (!timer_installed) {
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131 return(-1);
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132 }
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133 return(SDL_SetTimerThreaded(0));
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134 }
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135
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136 void SDL_SYS_TimerQuit(void)
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137 {
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138 void *oldpile;
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139
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140 if (timer_installed) {
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141 /* Uninstall RunTimer vbl vector */
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142 oldpile=(void *)Super(0);
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143 SDL_AtariVblUninstall(RunTimer);
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144 Super(oldpile);
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145 timer_installed = SDL_FALSE;
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146 }
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147 }
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148
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149 int SDL_SYS_StartTimer(void)
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150 {
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151 SDL_SetError("Internal logic error: MiNT uses vbl timer");
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152 return(-1);
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153 }
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154
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155 void SDL_SYS_StopTimer(void)
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156 {
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157 return;
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158 }