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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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131
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9 -- Copyright (C) 1998-2018, 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 version uses gettimeofday and select
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33 -- This file is suitable for Solaris (32 and 64 bits).
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34
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35 package body System.OS_Primitives is
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36
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37 -- ??? These definitions are duplicated from System.OS_Interface
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38 -- because we don't want to depend on any package. Consider removing
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39 -- these declarations in System.OS_Interface and move these ones in
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40 -- the spec.
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41
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42 type struct_timeval is record
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43 tv_sec : Long_Integer;
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44 tv_usec : Long_Integer;
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45 end record;
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46 pragma Convention (C, struct_timeval);
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47
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48 procedure gettimeofday
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49 (tv : not null access struct_timeval;
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50 tz : Address := Null_Address);
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51 pragma Import (C, gettimeofday, "gettimeofday");
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52
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53 procedure C_select
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54 (n : Integer := 0;
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55 readfds,
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56 writefds,
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57 exceptfds : Address := Null_Address;
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58 timeout : not null access struct_timeval);
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59 pragma Import (C, C_select, "select");
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60
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61 -----------
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62 -- Clock --
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63 -----------
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64
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65 function Clock return Duration is
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66 TV : aliased struct_timeval;
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67
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68 begin
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69 gettimeofday (TV'Access);
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70 return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
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71 end Clock;
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72
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73 -----------------
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74 -- Timed_Delay --
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75 -----------------
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76
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77 procedure Timed_Delay
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78 (Time : Duration;
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79 Mode : Integer)
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80 is
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81 Rel_Time : Duration;
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82 Abs_Time : Duration;
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83 Base_Time : constant Duration := Clock;
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84 Check_Time : Duration := Base_Time;
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85 timeval : aliased struct_timeval;
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86
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87 begin
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88 if Mode = Relative then
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89 Rel_Time := Time;
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90 Abs_Time := Time + Check_Time;
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91 else
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92 Rel_Time := Time - Check_Time;
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93 Abs_Time := Time;
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94 end if;
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95
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96 if Rel_Time > 0.0 then
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97 loop
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98 timeval.tv_sec := Long_Integer (Rel_Time);
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99
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100 if Duration (timeval.tv_sec) > Rel_Time then
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101 timeval.tv_sec := timeval.tv_sec - 1;
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102 end if;
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103
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104 timeval.tv_usec :=
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105 Long_Integer ((Rel_Time - Duration (timeval.tv_sec)) * 10#1#E6);
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106
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107 C_select (timeout => timeval'Unchecked_Access);
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108 Check_Time := Clock;
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109
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110 exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
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111
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112 Rel_Time := Abs_Time - Check_Time;
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113 end loop;
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114 end if;
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115 end Timed_Delay;
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116
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117 ----------------
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118 -- Initialize --
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119 ----------------
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120
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121 procedure Initialize is
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122 begin
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123 null;
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124 end Initialize;
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125
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126 end System.OS_Primitives;
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