| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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) 1991-1994, Florida State University -- |
| -- Copyright (C) 1995-2012, 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 -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- GNARL was developed by the GNARL team at Florida State University. -- |
| -- Extensive contributions were provided by Ada Core Technologies, Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This is the Alpha/VMS version |
| |
| with System.OS_Primitives; |
| with System.Soft_Links; |
| |
| package body Ada.Calendar.Delays is |
| |
| package OSP renames System.OS_Primitives; |
| package TSL renames System.Soft_Links; |
| |
| use type TSL.Timed_Delay_Call; |
| |
| ----------------------- |
| -- 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 |
| TSL.Timed_Delay.all |
| (Duration'Min (D, OSP.Max_Sensible_Delay), OSP.Relative); |
| end Delay_For; |
| |
| ----------------- |
| -- Delay_Until -- |
| ----------------- |
| |
| procedure Delay_Until (T : Time) is |
| begin |
| TSL.Timed_Delay.all (To_Duration (T), OSP.Absolute_Calendar); |
| end Delay_Until; |
| |
| ----------------- |
| -- To_Duration -- |
| ----------------- |
| |
| function To_Duration (T : Time) return Duration is |
| Safe_Ada_High : constant Time := Time_Of (2250, 1, 1, 0.0); |
| -- A value distant enough to emulate "end of time" but which does not |
| -- cause overflow. |
| |
| Safe_T : constant Time := |
| (if T > Safe_Ada_High then Safe_Ada_High else T); |
| |
| begin |
| return OSP.To_Duration (OSP.OS_Time (Safe_T), OSP.Absolute_Calendar); |
| end To_Duration; |
| |
| -------------------- |
| -- Timed_Delay_NT -- |
| -------------------- |
| |
| procedure Timed_Delay_NT (Time : Duration; Mode : Integer) is |
| begin |
| OSP.Timed_Delay (Time, Mode); |
| end Timed_Delay_NT; |
| |
| 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 TSL.Timed_Delay = null then |
| TSL.Timed_Delay := Timed_Delay_NT'Access; |
| end if; |
| end Ada.Calendar.Delays; |
