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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 . R E A L _ T I M E . 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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131
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9 -- Copyright (C) 1992-2018, 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 with Ada.Exceptions;
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33
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34 with System.Tasking;
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35 with System.Task_Primitives.Operations;
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36
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37 package body Ada.Real_Time.Delays is
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38
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39 package STPO renames System.Task_Primitives.Operations;
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40
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41 ----------------
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42 -- Local Data --
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43 ----------------
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44
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45 Absolute_RT : constant := 2;
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46
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47 -----------------
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48 -- Delay_Until --
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49 -----------------
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50
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51 procedure Delay_Until (T : Time) is
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52 Self_Id : constant System.Tasking.Task_Id := STPO.Self;
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53
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54 begin
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55 -- If pragma Detect_Blocking is active, Program_Error must be
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56 -- raised if this potentially blocking operation is called from a
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57 -- protected action.
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58
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59 if System.Tasking.Detect_Blocking
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60 and then Self_Id.Common.Protected_Action_Nesting > 0
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61 then
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62 Ada.Exceptions.Raise_Exception
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63 (Program_Error'Identity, "potentially blocking operation");
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64 else
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65 STPO.Timed_Delay (Self_Id, To_Duration (T), Absolute_RT);
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66 end if;
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67 end Delay_Until;
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68
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69 -----------------
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70 -- To_Duration --
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71 -----------------
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72
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73 function To_Duration (T : Time) return Duration is
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74 begin
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75 return To_Duration (Time_Span (T));
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76 end To_Duration;
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77
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78 end Ada.Real_Time.Delays;
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