New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45953 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 113 insertions, 0 deletions

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+------------------------------------------------------------------------------
+--                                                                          --
+--                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;