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------------------------------------------------------------------------------
--                                                                          --
--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
--                                                                          --
--                   A D A . C A L E N D A R . D E L A Y S                  --
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--                                  B o d y                                 --
--                                                                          --
--             Copyright (C) 1991-1994, Florida State University            --
--                     Copyright (C) 1995-2008, AdaCore                     --
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-- 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- --
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-- As a special exception,  if other files  instantiate  generics from this --
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------------------------------------------------------------------------------
 
with System.OS_Primitives;
with System.Soft_Links;
with System.Traces;
with System.Parameters;
 
package body Ada.Calendar.Delays is
 
   package OSP renames System.OS_Primitives;
   package SSL renames System.Soft_Links;
 
   use type SSL.Timed_Delay_Call;
 
   use System.Traces;
 
   --  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
      if System.Parameters.Runtime_Traces then
         Send_Trace_Info (W_Delay, D);
      end if;
 
      SSL.Timed_Delay.all (Duration'Min (D, OSP.Max_Sensible_Delay),
                           OSP.Relative);
 
      if System.Parameters.Runtime_Traces then
         Send_Trace_Info (M_Delay, D);
      end if;
   end Delay_For;
 
   -----------------
   -- Delay_Until --
   -----------------
 
   procedure Delay_Until (T : Time) is
      D : constant Duration := To_Duration (T);
 
   begin
      if System.Parameters.Runtime_Traces then
         Send_Trace_Info (WU_Delay, D);
      end if;
 
      SSL.Timed_Delay.all (D, OSP.Absolute_Calendar);
 
      if System.Parameters.Runtime_Traces then
         Send_Trace_Info (M_Delay, D);
      end if;
   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;