1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- 4-- -- 5-- A D A . R E A L _ T I M E . D E L A Y S -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1992-2019, Free Software Foundation, Inc. -- 10-- -- 11-- GNARL is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNARL was developed by the GNARL team at Florida State University. -- 28-- Extensive contributions were provided by Ada Core Technologies, Inc. -- 29-- -- 30------------------------------------------------------------------------------ 31 32with Ada.Exceptions; 33 34with System.Tasking; 35with System.Task_Primitives.Operations; 36 37package body Ada.Real_Time.Delays is 38 39 package STPO renames System.Task_Primitives.Operations; 40 41 ---------------- 42 -- Local Data -- 43 ---------------- 44 45 Absolute_RT : constant := 2; 46 47 ----------------- 48 -- Delay_Until -- 49 ----------------- 50 51 procedure Delay_Until (T : Time) is 52 Self_Id : constant System.Tasking.Task_Id := STPO.Self; 53 54 begin 55 -- If pragma Detect_Blocking is active, Program_Error must be 56 -- raised if this potentially blocking operation is called from a 57 -- protected action. 58 59 if System.Tasking.Detect_Blocking 60 and then Self_Id.Common.Protected_Action_Nesting > 0 61 then 62 Ada.Exceptions.Raise_Exception 63 (Program_Error'Identity, "potentially blocking operation"); 64 else 65 STPO.Timed_Delay (Self_Id, To_Duration (T), Absolute_RT); 66 end if; 67 end Delay_Until; 68 69 ----------------- 70 -- To_Duration -- 71 ----------------- 72 73 function To_Duration (T : Time) return Duration is 74 begin 75 return To_Duration (Time_Span (T)); 76 end To_Duration; 77 78end Ada.Real_Time.Delays; 79