------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- -- -- -- A D A . C A L E N D A R . D E L A Y S -- -- -- -- B o d y -- -- -- -- Copyright (C) 1991-2017, Florida State University -- -- Copyright (C) 1995-2018, AdaCore -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- . -- -- -- -- GNARL was developed by the GNARL team at Florida State University. -- -- Extensive contributions were provided by Ada Core Technologies, Inc. -- -- -- ------------------------------------------------------------------------------ with System.OS_Primitives; with System.Soft_Links; package body Ada.Calendar.Delays is package OSP renames System.OS_Primitives; package SSL renames System.Soft_Links; use type SSL.Timed_Delay_Call; -- Earlier, System.Time_Operations was used to implement the following -- operations. The idea was to avoid sucking in the tasking packages. This -- did not work. Logically, we can't have it both ways. There is no way to -- implement time delays that will have correct task semantics without -- reference to the tasking run-time system. To achieve this goal, we now -- use soft links. ----------------------- -- Local Subprograms -- ----------------------- procedure Timed_Delay_NT (Time : Duration; Mode : Integer); -- Timed delay procedure used when no tasking is active --------------- -- Delay_For -- --------------- procedure Delay_For (D : Duration) is begin SSL.Timed_Delay.all (Duration'Min (D, OSP.Max_Sensible_Delay), OSP.Relative); end Delay_For; ----------------- -- Delay_Until -- ----------------- procedure Delay_Until (T : Time) is D : constant Duration := To_Duration (T); begin SSL.Timed_Delay.all (D, OSP.Absolute_Calendar); end Delay_Until; -------------------- -- Timed_Delay_NT -- -------------------- procedure Timed_Delay_NT (Time : Duration; Mode : Integer) is begin OSP.Timed_Delay (Time, Mode); end Timed_Delay_NT; ----------------- -- To_Duration -- ----------------- function To_Duration (T : Time) return Duration is begin -- Since time has multiple representations on different platforms, a -- target independent operation in Ada.Calendar is used to perform -- this conversion. return Delay_Operations.To_Duration (T); end To_Duration; begin -- Set up the Timed_Delay soft link to the non tasking version if it has -- not been already set. If tasking is present, Timed_Delay has already set -- this soft link, or this will be overridden during the elaboration of -- System.Tasking.Initialization if SSL.Timed_Delay = null then SSL.Timed_Delay := Timed_Delay_NT'Access; end if; end Ada.Calendar.Delays;