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annotate src/timer/macos/SDL_systimer.c @ 1668:4da1ee79c9af SDL-1.3

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more tweaking indent options
author Sam Lantinga <slouken@libsdl.org>
date Mon, 29 May 2006 04:04:35 +0000
parents 782fd950bd46
children
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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 #ifdef SDL_TIMER_MACOS
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25
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26 #include <Types.h>
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27 #include <Timer.h>
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28 #include <OSUtils.h>
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29 #include <Gestalt.h>
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30 #include <Processes.h>
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31
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32 #include <LowMem.h>
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33
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34 #include "SDL_timer.h"
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35 #include "../SDL_timer_c.h"
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36
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37 #include "FastTimes.h"
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38
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39 #if TARGET_API_MAC_CARBON
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40 #define NewTimerProc NewTimerUPP
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41 #endif
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42
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43 #define MS_PER_TICK (1000.0/60.0) /* MacOS tick = 1/60 second */
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44
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45
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46 #define kTwoPower32 (4294967296.0) /* 2^32 */
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47
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48 static double start_tick;
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49 static int is_fast_inited = 0;
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50
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51 void
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52 SDL_StartTicks(void)
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53 {
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54 if (!is_fast_inited) // important to check or FastTime may hang machine!
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55 SDL_SYS_TimerInit();
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56
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57 start_tick = FastMicroseconds();
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58 }
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59
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60 Uint32
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61 SDL_GetTicks(void)
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62 {
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63
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64 if (!is_fast_inited)
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65 SDL_SYS_TimerInit();
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66
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67 return FastMilliseconds();
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68 }
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69
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70 void
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71 SDL_Delay(Uint32 ms)
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72 {
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73 Uint32 stop, now;
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74
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75 stop = SDL_GetTicks() + ms;
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76 do {
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77 #if TARGET_API_MAC_CARBON
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78 MPYield();
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79 #else
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80 SystemTask();
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81 #endif
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82
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83 now = SDL_GetTicks();
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84
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85 }
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86 while (stop > now);
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87 }
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88
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89 /*
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90 void SDL_StartTicks(void)
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91 {
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92 // FIXME: Should we implement a wrapping algorithm, like Win32?
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93 }
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94
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95 Uint32 SDL_GetTicks(void)
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96 {
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97 UnsignedWide ms;
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98
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99 Microseconds (&ms);
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100
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101 return ( ms.lo / 1000 );
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102 }
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103
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104 void SDL_Delay(Uint32 ms)
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105 {
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106
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107 UnsignedWide microsecs;
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108 UInt32 stop;
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109
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110 Microseconds (&microsecs);
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111
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112 stop = microsecs.lo + (ms * 1000);
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113
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114 while ( stop > microsecs.lo ) {
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115
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116 SystemTask ();
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117
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118 Microseconds (&microsecs);
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119 }
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120
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121 }*/
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122
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123 /* Data to handle a single periodic alarm */
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124 typedef struct _ExtendedTimerRec
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125 {
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126 TMTask tmTask;
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127 ProcessSerialNumber taskPSN;
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128 } ExtendedTimerRec, *ExtendedTimerPtr;
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129
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130 static ExtendedTimerRec gExtendedTimerRec;
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131
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132
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133 int
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134 SDL_SYS_TimerInit(void)
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135 {
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136 FastInitialize();
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137 is_fast_inited = 1;
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138
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139 return (0);
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140 }
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141
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142 void
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143 SDL_SYS_TimerQuit(void)
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144 {
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145 /* We don't need a cleanup? */
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146 return;
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147 }
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148
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149 /* Our Stub routine to set up and then call the real routine. */
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150 pascal void
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151 TimerCallbackProc(TMTaskPtr tmTaskPtr)
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152 {
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153 Uint32 ms;
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154
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155 WakeUpProcess(&((ExtendedTimerPtr) tmTaskPtr)->taskPSN);
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156
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157 ms = SDL_alarm_callback(SDL_alarm_interval);
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158 if (ms) {
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159 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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160 PrimeTime((QElemPtr) & gExtendedTimerRec.tmTask, SDL_alarm_interval);
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161 } else {
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162 SDL_alarm_interval = 0;
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163 }
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164 }
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165
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166 int
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167 SDL_SYS_StartTimer(void)
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168 {
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169 /*
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170 * Configure the global structure that stores the timing information.
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171 */
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172 gExtendedTimerRec.tmTask.qLink = NULL;
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173 gExtendedTimerRec.tmTask.qType = 0;
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174 gExtendedTimerRec.tmTask.tmAddr = NewTimerProc(TimerCallbackProc);
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175 gExtendedTimerRec.tmTask.tmCount = 0;
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176 gExtendedTimerRec.tmTask.tmWakeUp = 0;
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177 gExtendedTimerRec.tmTask.tmReserved = 0;
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178 GetCurrentProcess(&gExtendedTimerRec.taskPSN);
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179
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180 /* Install the task record */
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181 InsXTime((QElemPtr) & gExtendedTimerRec.tmTask);
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182
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183 /* Go! */
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184 PrimeTime((QElemPtr) & gExtendedTimerRec.tmTask, SDL_alarm_interval);
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185 return (0);
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186 }
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187
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188 void
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189 SDL_SYS_StopTimer(void)
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190 {
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191 RmvTime((QElemPtr) & gExtendedTimerRec.tmTask);
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192 }
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193
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194 #endif /* SDL_TIMER_MACOS */
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195 /* vi: set ts=4 sw=4 expandtab: */