| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNU ADA 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 -- |
| -- -- |
| -- $Revision: 1.37 $ |
| -- -- |
| -- Copyright (C) 1991-2001 Florida State University -- |
| -- -- |
| -- GNARL 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 2, or (at your option) any later ver- -- |
| -- sion. GNARL 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. See the GNU General Public License -- |
| -- for more details. You should have received a copy of the GNU General -- |
| -- Public License distributed with GNARL; see file COPYING. If not, write -- |
| -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- |
| -- MA 02111-1307, USA. -- |
| -- -- |
| -- As a special exception, if other files instantiate generics from this -- |
| -- unit, or you link this unit with other files to produce an executable, -- |
| -- this unit does not by itself cause the resulting executable to be -- |
| -- covered by the GNU General Public License. This exception does not -- |
| -- however invalidate any other reasons why the executable file might be -- |
| -- covered by the GNU Public License. -- |
| -- -- |
| -- GNARL was developed by the GNARL team at Florida State University. It is -- |
| -- now maintained by Ada Core Technologies Inc. in cooperation with Florida -- |
| -- State University (http://www.gnat.com). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with System.OS_Primitives; |
| -- Used for Delay_Modes |
| -- Max_Sensible_Delay |
| |
| with System.Soft_Links; |
| -- Used for Timed_Delay |
| |
| 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, the following operations were implemented using |
| -- System.Time_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 |
| begin |
| SSL.Timed_Delay.all (To_Duration (T), 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 |
| return 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 overriden 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; |
