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annotate src/timer/mint/SDL_systimer.c @ 1402:d910939febfa

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Use consistent identifiers for the various platforms we support. Make sure every source file includes SDL_config.h, so the proper system headers are chosen.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 21 Feb 2006 08:46:50 +0000
parents 428c8690cf73
children 92947e3a18db
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 /*
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25 * TOS/MiNT timer driver
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26 * based on vbl vector
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27 *
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28 * Patrice Mandin
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29 */
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30
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31 #include <stdio.h>
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32 #include <sys/time.h>
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33 #include <signal.h>
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34 #include <unistd.h>
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35 #include <string.h>
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36 #include <errno.h>
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37
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38 #include <mint/cookie.h>
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39 #include <mint/sysvars.h>
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40 #include <mint/osbind.h>
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41 #include <mint/mintbind.h>
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42
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43 #include "SDL_timer.h"
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44 #include "../SDL_timer_c.h"
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45 #include "SDL_thread.h"
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46
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47 #include "SDL_vbltimer_s.h"
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48
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49 /* The first ticks value of the application */
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50 static Uint32 start;
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51 static SDL_bool supervisor;
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52 static int mint_present; /* can we use Syield() ? */
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53
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54 void SDL_StartTicks(void)
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55 {
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56 void *oldpile;
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57 unsigned long dummy;
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58
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59 /* Set first ticks value */
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60 oldpile=(void *)Super(0);
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61 start=*((volatile long *)_hz_200);
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62 Super(oldpile);
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63
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64 start *= 5; /* One _hz_200 tic is 5ms */
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65
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66 mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
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67 }
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68
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69 Uint32 SDL_GetTicks (void)
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70 {
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71 Uint32 now;
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72 void *oldpile=NULL;
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73
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74 /* Check if we are in supervisor mode
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75 (this is the case when called from SDL_ThreadedTimerCheck,
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76 which is called from RunTimer, running in the vbl vector)
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77 */
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78 if (!supervisor) {
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79 oldpile=(void *)Super(0);
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80 }
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81
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82 now=*((volatile long *)_hz_200);
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83
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84 if (!supervisor) {
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85 Super(oldpile);
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86 }
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87
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88 return((now*5)-start);
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89 }
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90
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91 void SDL_Delay (Uint32 ms)
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92 {
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93 Uint32 now;
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94
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95 now = SDL_GetTicks();
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96 while ((SDL_GetTicks()-now)<ms){
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97 if (mint_present) {
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98 Syield();
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99 }
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100 }
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101 }
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102
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103 /* Data to handle a single periodic alarm */
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104 static SDL_bool timer_installed=SDL_FALSE;
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105
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106 static void RunTimer(void)
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107 {
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108 supervisor=SDL_TRUE;
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109 SDL_ThreadedTimerCheck();
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110 supervisor=SDL_FALSE;
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111 }
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112
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113 /* This is only called if the event thread is not running */
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114 int SDL_SYS_TimerInit(void)
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115 {
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116 void *oldpile;
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117
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118 supervisor=SDL_FALSE;
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119
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120 /* Install RunTimer in vbl vector */
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121 oldpile=(void *)Super(0);
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122 timer_installed = !SDL_AtariVblInstall(RunTimer);
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123 Super(oldpile);
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124
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125 if (!timer_installed) {
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126 return(-1);
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127 }
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128 return(SDL_SetTimerThreaded(0));
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129 }
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130
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131 void SDL_SYS_TimerQuit(void)
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132 {
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133 void *oldpile;
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134
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135 if (timer_installed) {
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136 /* Uninstall RunTimer vbl vector */
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137 oldpile=(void *)Super(0);
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138 SDL_AtariVblUninstall(RunTimer);
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139 Super(oldpile);
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140 timer_installed = SDL_FALSE;
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141 }
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142 }
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143
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144 int SDL_SYS_StartTimer(void)
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145 {
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146 SDL_SetError("Internal logic error: MiNT uses vbl timer");
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147 return(-1);
c5010ab8ba35 Added initial support for Atari (thanks Patrice!)
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148 }
c5010ab8ba35 Added initial support for Atari (thanks Patrice!)
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149
c5010ab8ba35 Added initial support for Atari (thanks Patrice!)
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150 void SDL_SYS_StopTimer(void)
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151 {
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152 return;
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153 }