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annotate src/timer/mint/SDL_systimer.c @ 1045:63b8e93a3a52

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Release CPU when waiting
author Patrice Mandin <patmandin@gmail.com>
date Fri, 01 Apr 2005 15:19:26 +0000
parents b8d311d90021
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 }