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annotate src/timer/mint/SDL_systimer.c @ 308:ee32ed29a507

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author Sam Lantinga <slouken@libsdl.org>
date Sun, 10 Mar 2002 03:55:45 +0000
parents f6ffac90895c
children 0ce5a68278fd
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
297
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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/osbind.h>
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43 #include <sysvars.h>
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44
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45 #include "SDL_error.h"
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46 #include "SDL_timer.h"
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47 #include "SDL_timer_c.h"
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48 #include "SDL_thread.h"
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49
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50 #include "SDL_vbltimer_s.h"
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51
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52 /* The first ticks value of the application */
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53 static Uint32 start;
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54 static SDL_bool supervisor;
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55
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56 void SDL_StartTicks(void)
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57 {
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58 void *oldpile;
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59
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60 /* Set first ticks value */
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61 oldpile=(void *)Super(0);
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62 start=*((volatile long *)_hz_200);
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63 Super(oldpile);
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64
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65 start *= 5; /* One _hz_200 tic is 5ms */
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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;
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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 }
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97 }
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98
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99 /* Data to handle a single periodic alarm */
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100 static SDL_bool timer_installed=SDL_FALSE;
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101
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102 static void RunTimer(void)
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103 {
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104 supervisor=SDL_TRUE;
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105 SDL_ThreadedTimerCheck();
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106 supervisor=SDL_FALSE;
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107 }
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108
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109 /* This is only called if the event thread is not running */
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110 int SDL_SYS_TimerInit(void)
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111 {
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112 void *oldpile;
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113
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114 supervisor=SDL_FALSE;
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115
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116 /* Install RunTimer in vbl vector */
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117 oldpile=(void *)Super(0);
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118 timer_installed = !SDL_AtariVblInstall(RunTimer);
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119 Super(oldpile);
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120
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121 if (!timer_installed) {
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122 return(-1);
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123 }
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124 return(SDL_SetTimerThreaded(0));
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125 }
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126
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127 void SDL_SYS_TimerQuit(void)
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128 {
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129 void *oldpile;
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130
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131 if (timer_installed) {
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132 /* Uninstall RunTimer vbl vector */
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133 oldpile=(void *)Super(0);
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134 SDL_AtariVblUninstall(RunTimer);
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135 Super(oldpile);
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136 timer_installed = SDL_FALSE;
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137 }
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138 }
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139
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140 int SDL_SYS_StartTimer(void)
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141 {
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142 SDL_SetError("Internal logic error: MiNT uses vbl timer");
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143 return(-1);
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144 }
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145
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146 void SDL_SYS_StopTimer(void)
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147 {
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148 return;
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149 }