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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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4 -- --
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5 -- S Y S T E M . O S _ I N T E R F A C E --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 1999-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNARL is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNARL was developed by the GNARL team at Florida State University. --
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28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This is a Darwin Threads version of this package
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33
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34 pragma Polling (Off);
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35 -- Turn off polling, we do not want ATC polling to take place during
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36 -- tasking operations. It causes infinite loops and other problems.
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37
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38 with Interfaces.C.Extensions;
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39
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40 package body System.OS_Interface is
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41 use Interfaces.C;
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42
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43 -----------------
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44 -- To_Duration --
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45 -----------------
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46
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47 function To_Duration (TS : timespec) return Duration is
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48 begin
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49 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
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50 end To_Duration;
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51
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52 ------------------------
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53 -- To_Target_Priority --
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54 ------------------------
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55
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56 function To_Target_Priority
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57 (Prio : System.Any_Priority) return Interfaces.C.int
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58 is
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59 begin
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60 return Interfaces.C.int (Prio);
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61 end To_Target_Priority;
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62
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63 -----------------
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64 -- To_Timespec --
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65 -----------------
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66
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67 function To_Timespec (D : Duration) return timespec is
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68 S : time_t;
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69 F : Duration;
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70
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71 begin
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72 S := time_t (Long_Long_Integer (D));
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73 F := D - Duration (S);
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74
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75 -- If F has negative value due to a round-up, adjust for positive F
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76 -- value.
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77
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78 if F < 0.0 then
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79 S := S - 1;
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80 F := F + 1.0;
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81 end if;
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82
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83 return timespec'(tv_sec => S,
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84 tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
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85 end To_Timespec;
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86
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87 -------------------
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88 -- clock_gettime --
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89 -------------------
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90
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91 function clock_gettime
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92 (clock_id : clockid_t;
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93 tp : access timespec) return int
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94 is
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95 pragma Unreferenced (clock_id);
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96
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97 -- Darwin Threads don't have clock_gettime, so use gettimeofday
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98
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99 use Interfaces;
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100
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101 type timeval is array (1 .. 3) of C.long;
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102 -- The timeval array is sized to contain long_long sec and long usec.
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103 -- If long_long'Size = long'Size then it will be overly large but that
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104 -- won't effect the implementation since it's not accessed directly.
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105
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106 procedure timeval_to_duration
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107 (T : not null access timeval;
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108 sec : not null access C.Extensions.long_long;
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109 usec : not null access C.long);
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110 pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration");
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111
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112 Micro : constant := 10**6;
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113 sec : aliased C.Extensions.long_long;
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114 usec : aliased C.long;
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115 TV : aliased timeval;
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116 Result : int;
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117
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118 function gettimeofday
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119 (Tv : access timeval;
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120 Tz : System.Address := System.Null_Address) return int;
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121 pragma Import (C, gettimeofday, "gettimeofday");
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122
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123 begin
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124 Result := gettimeofday (TV'Access, System.Null_Address);
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125 pragma Assert (Result = 0);
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126 timeval_to_duration (TV'Access, sec'Access, usec'Access);
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127 tp.all := To_Timespec (Duration (sec) + Duration (usec) / Micro);
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128 return Result;
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129 end clock_gettime;
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130
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131 ------------------
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132 -- clock_getres --
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133 ------------------
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134
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135 function clock_getres
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136 (clock_id : clockid_t;
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137 res : access timespec) return int
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138 is
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139 pragma Unreferenced (clock_id);
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140
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141 -- Darwin Threads don't have clock_getres.
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142
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143 Nano : constant := 10**9;
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144 nsec : int := 0;
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145 Result : int := -1;
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146
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147 function clock_get_res return int;
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148 pragma Import (C, clock_get_res, "__gnat_clock_get_res");
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149
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150 begin
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151 nsec := clock_get_res;
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152 res.all := To_Timespec (Duration (0.0) + Duration (nsec) / Nano);
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153
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154 if nsec > 0 then
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155 Result := 0;
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156 end if;
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157
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158 return Result;
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159 end clock_getres;
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160
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161 -----------------
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162 -- sched_yield --
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163 -----------------
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164
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165 function sched_yield return int is
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166 procedure sched_yield_base (arg : System.Address);
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167 pragma Import (C, sched_yield_base, "pthread_yield_np");
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168
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169 begin
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170 sched_yield_base (System.Null_Address);
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171 return 0;
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172 end sched_yield;
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173
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174 ------------------
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175 -- pthread_init --
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176 ------------------
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177
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178 procedure pthread_init is
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179 begin
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180 null;
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181 end pthread_init;
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182
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131
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183 --------------------
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184 -- Get_Stack_Base --
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185 --------------------
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111
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186
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187 function Get_Stack_Base (thread : pthread_t) return Address is
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188 pragma Unreferenced (thread);
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189 begin
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190 return System.Null_Address;
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191 end Get_Stack_Base;
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192
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193 end System.OS_Interface;
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