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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 -- A D A . C A L E N D A R . D E L A Y 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) 1991-2017, Florida State University --
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131
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10 -- Copyright (C) 1995-2018, AdaCore --
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111
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11 -- --
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12 -- GNAT is free software; you can redistribute it and/or modify it under --
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13 -- terms of the GNU General Public License as published by the Free Soft- --
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14 -- ware Foundation; either version 3, or (at your option) any later ver- --
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15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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17 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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18 -- --
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19 -- As a special exception under Section 7 of GPL version 3, you are granted --
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20 -- additional permissions described in the GCC Runtime Library Exception, --
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21 -- version 3.1, as published by the Free Software Foundation. --
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22 -- --
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23 -- You should have received a copy of the GNU General Public License and --
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24 -- a copy of the GCC Runtime Library Exception along with this program; --
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25 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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26 -- <http://www.gnu.org/licenses/>. --
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27 -- --
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28 -- GNARL was developed by the GNARL team at Florida State University. --
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29 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
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30 -- --
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31 ------------------------------------------------------------------------------
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32
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33 with System.OS_Primitives;
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34 with System.Soft_Links;
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35
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36 package body Ada.Calendar.Delays is
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37
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38 package OSP renames System.OS_Primitives;
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39 package SSL renames System.Soft_Links;
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40
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41 use type SSL.Timed_Delay_Call;
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42
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43 -- Earlier, System.Time_Operations was used to implement the following
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44 -- operations. The idea was to avoid sucking in the tasking packages. This
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45 -- did not work. Logically, we can't have it both ways. There is no way to
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46 -- implement time delays that will have correct task semantics without
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47 -- reference to the tasking run-time system. To achieve this goal, we now
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48 -- use soft links.
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49
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50 -----------------------
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51 -- Local Subprograms --
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52 -----------------------
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53
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54 procedure Timed_Delay_NT (Time : Duration; Mode : Integer);
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55 -- Timed delay procedure used when no tasking is active
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56
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57 ---------------
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58 -- Delay_For --
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59 ---------------
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60
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61 procedure Delay_For (D : Duration) is
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62 begin
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63 SSL.Timed_Delay.all (Duration'Min (D, OSP.Max_Sensible_Delay),
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64 OSP.Relative);
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65 end Delay_For;
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66
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67 -----------------
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68 -- Delay_Until --
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69 -----------------
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70
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71 procedure Delay_Until (T : Time) is
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72 D : constant Duration := To_Duration (T);
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73
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74 begin
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75 SSL.Timed_Delay.all (D, OSP.Absolute_Calendar);
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76 end Delay_Until;
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77
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78 --------------------
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79 -- Timed_Delay_NT --
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80 --------------------
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81
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82 procedure Timed_Delay_NT (Time : Duration; Mode : Integer) is
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83 begin
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84 OSP.Timed_Delay (Time, Mode);
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85 end Timed_Delay_NT;
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86
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87 -----------------
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88 -- To_Duration --
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89 -----------------
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90
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91 function To_Duration (T : Time) return Duration is
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92 begin
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93 -- Since time has multiple representations on different platforms, a
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94 -- target independent operation in Ada.Calendar is used to perform
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95 -- this conversion.
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96
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97 return Delay_Operations.To_Duration (T);
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98 end To_Duration;
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99
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100 begin
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101 -- Set up the Timed_Delay soft link to the non tasking version if it has
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102 -- not been already set. If tasking is present, Timed_Delay has already set
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103 -- this soft link, or this will be overridden during the elaboration of
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104 -- System.Tasking.Initialization
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105
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106 if SSL.Timed_Delay = null then
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107 SSL.Timed_Delay := Timed_Delay_NT'Access;
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108 end if;
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109
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110 end Ada.Calendar.Delays;
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