------------------------------------------------------------------------------ -- -- -- 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) 1995-2005, AdaCore -- -- -- -- 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, 51 Franklin Street, Fifth Floor, -- -- Boston, MA 02110-1301, 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. -- -- Extensive contributions were provided by Ada Core Technologies, Inc. -- -- -- ------------------------------------------------------------------------------ with System.OS_Primitives; -- Used for Delay_Modes -- Max_Sensible_Delay with System.Soft_Links; -- Used for Timed_Delay with System.Traces; -- Used for Send_Trace_Info with System.Parameters; -- used for Runtime_Traces 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, 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 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 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;