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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 _ P R I M I T I V E S --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 1998-2018, Free Software Foundation, Inc. --
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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 version is for POSIX-like operating systems
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33
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34 package body System.OS_Primitives is
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35
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36 -- ??? These definitions are duplicated from System.OS_Interface
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37 -- because we don't want to depend on any package. Consider removing
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38 -- these declarations in System.OS_Interface and move these ones in
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39 -- the spec.
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40
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41 type time_t is new Long_Long_Integer;
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42
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43 type timespec is record
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44 tv_sec : time_t;
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45 tv_nsec : Long_Integer;
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46 end record;
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47 pragma Convention (C, timespec);
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48
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49 function nanosleep (rqtp, rmtp : not null access timespec) return Integer;
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50 pragma Import (C, nanosleep, "nanosleep");
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51
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52 -----------
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53 -- Clock --
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54 -----------
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55
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56 function Clock return Duration is
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57
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58 type timeval is record
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59 tv_sec : time_t;
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60 tv_usec : Long_Integer;
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61 end record;
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62 pragma Convention (C, timeval);
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63
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64 procedure timeval_to_duration
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65 (T : not null access timeval;
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66 sec : not null access Long_Long_Integer;
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67 usec : not null access Long_Integer);
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68 pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration");
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69
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70 Micro : constant := 10**6;
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71 sec : aliased Long_Long_Integer;
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72 usec : aliased Long_Integer;
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73 TV : aliased timeval;
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74 Result : Integer;
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75 pragma Unreferenced (Result);
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76
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77 function gettimeofday
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78 (Tv : access timeval;
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79 Tz : System.Address := System.Null_Address) return Integer;
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80 pragma Import (C, gettimeofday, "gettimeofday");
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81
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82 begin
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83 -- The return codes for gettimeofday are as follows (from man pages):
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84 -- EPERM settimeofday is called by someone other than the superuser
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85 -- EINVAL Timezone (or something else) is invalid
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86 -- EFAULT One of tv or tz pointed outside accessible address space
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87
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88 -- None of these codes signal a potential clock skew, hence the return
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89 -- value is never checked.
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90
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91 Result := gettimeofday (TV'Access, System.Null_Address);
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92 timeval_to_duration (TV'Access, sec'Access, usec'Access);
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93 return Duration (sec) + Duration (usec) / Micro;
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94 end Clock;
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95
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96 -----------------
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97 -- To_Timespec --
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98 -----------------
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99
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100 function To_Timespec (D : Duration) return timespec;
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101
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102 function To_Timespec (D : Duration) return timespec is
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103 S : time_t;
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104 F : Duration;
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105
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106 begin
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107 S := time_t (Long_Long_Integer (D));
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108 F := D - Duration (S);
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109
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110 -- If F has negative value due to a round-up, adjust for positive F
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111 -- value.
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112
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113 if F < 0.0 then
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114 S := S - 1;
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115 F := F + 1.0;
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116 end if;
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117
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118 return
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119 timespec'(tv_sec => S,
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120 tv_nsec => Long_Integer (Long_Long_Integer (F * 10#1#E9)));
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121 end To_Timespec;
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122
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123 -----------------
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124 -- Timed_Delay --
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125 -----------------
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126
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127 procedure Timed_Delay
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128 (Time : Duration;
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129 Mode : Integer)
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130 is
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131 Request : aliased timespec;
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132 Remaind : aliased timespec;
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133 Rel_Time : Duration;
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134 Abs_Time : Duration;
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135 Base_Time : constant Duration := Clock;
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136 Check_Time : Duration := Base_Time;
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137
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138 Result : Integer;
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139 pragma Unreferenced (Result);
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140
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141 begin
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142 if Mode = Relative then
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143 Rel_Time := Time;
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144 Abs_Time := Time + Check_Time;
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145 else
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146 Rel_Time := Time - Check_Time;
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147 Abs_Time := Time;
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148 end if;
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149
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150 if Rel_Time > 0.0 then
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151 loop
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152 Request := To_Timespec (Rel_Time);
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153 Result := nanosleep (Request'Access, Remaind'Access);
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154 Check_Time := Clock;
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155
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156 exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
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157
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158 Rel_Time := Abs_Time - Check_Time;
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159 end loop;
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160 end if;
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161 end Timed_Delay;
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162
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163 ----------------
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164 -- Initialize --
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165 ----------------
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166
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167 procedure Initialize is
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168 begin
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169 null;
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170 end Initialize;
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171
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172 end System.OS_Primitives;
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