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annotate src/timer/mint/SDL_systimer.c @ 1401:1819fd069e89

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author Sam Lantinga <slouken@libsdl.org>
date Tue, 21 Feb 2006 08:34:45 +0000
parents 428c8690cf73
children d910939febfa
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
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23 /*
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24 * TOS/MiNT timer driver
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25 * based on vbl vector
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26 *
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27 * Patrice Mandin
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28 */
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29
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30 #include <stdio.h>
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31 #include <sys/time.h>
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32 #include <signal.h>
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33 #include <unistd.h>
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34 #include <string.h>
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35 #include <errno.h>
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36
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37 #include <mint/cookie.h>
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38 #include <mint/sysvars.h>
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39 #include <mint/osbind.h>
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40 #include <mint/mintbind.h>
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41
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42 #include "SDL_timer.h"
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43 #include "../SDL_timer_c.h"
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44 #include "SDL_thread.h"
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45
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46 #include "SDL_vbltimer_s.h"
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47
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48 /* The first ticks value of the application */
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49 static Uint32 start;
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50 static SDL_bool supervisor;
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51 static int mint_present; /* can we use Syield() ? */
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52
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53 void SDL_StartTicks(void)
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54 {
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55 void *oldpile;
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56 unsigned long dummy;
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57
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58 /* Set first ticks value */
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59 oldpile=(void *)Super(0);
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60 start=*((volatile long *)_hz_200);
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61 Super(oldpile);
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62
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63 start *= 5; /* One _hz_200 tic is 5ms */
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64
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65 mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
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66 }
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67
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68 Uint32 SDL_GetTicks (void)
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69 {
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70 Uint32 now;
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71 void *oldpile=NULL;
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72
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73 /* Check if we are in supervisor mode
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74 (this is the case when called from SDL_ThreadedTimerCheck,
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75 which is called from RunTimer, running in the vbl vector)
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76 */
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77 if (!supervisor) {
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78 oldpile=(void *)Super(0);
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79 }
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80
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81 now=*((volatile long *)_hz_200);
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82
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83 if (!supervisor) {
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84 Super(oldpile);
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85 }
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86
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87 return((now*5)-start);
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88 }
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89
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90 void SDL_Delay (Uint32 ms)
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91 {
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92 Uint32 now;
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93
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94 now = SDL_GetTicks();
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95 while ((SDL_GetTicks()-now)<ms){
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96 if (mint_present) {
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97 Syield();
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98 }
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99 }
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100 }
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101
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102 /* Data to handle a single periodic alarm */
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103 static SDL_bool timer_installed=SDL_FALSE;
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104
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105 static void RunTimer(void)
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106 {
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107 supervisor=SDL_TRUE;
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108 SDL_ThreadedTimerCheck();
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109 supervisor=SDL_FALSE;
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110 }
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111
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112 /* This is only called if the event thread is not running */
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113 int SDL_SYS_TimerInit(void)
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114 {
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115 void *oldpile;
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116
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117 supervisor=SDL_FALSE;
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118
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119 /* Install RunTimer in vbl vector */
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120 oldpile=(void *)Super(0);
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121 timer_installed = !SDL_AtariVblInstall(RunTimer);
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122 Super(oldpile);
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123
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124 if (!timer_installed) {
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125 return(-1);
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126 }
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127 return(SDL_SetTimerThreaded(0));
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128 }
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129
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130 void SDL_SYS_TimerQuit(void)
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131 {
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132 void *oldpile;
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133
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134 if (timer_installed) {
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135 /* Uninstall RunTimer vbl vector */
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136 oldpile=(void *)Super(0);
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137 SDL_AtariVblUninstall(RunTimer);
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138 Super(oldpile);
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139 timer_installed = SDL_FALSE;
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140 }
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141 }
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142
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143 int SDL_SYS_StartTimer(void)
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144 {
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145 SDL_SetError("Internal logic error: MiNT uses vbl timer");
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146 return(-1);
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147 }
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148
c5010ab8ba35 Added initial support for Atari (thanks Patrice!)
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149 void SDL_SYS_StopTimer(void)
c5010ab8ba35 Added initial support for Atari (thanks Patrice!)
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150 {
c5010ab8ba35 Added initial support for Atari (thanks Patrice!)
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151 return;
c5010ab8ba35 Added initial support for Atari (thanks Patrice!)
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152 }