New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45957 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 86 insertions, 0 deletions

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+------------------------------------------------------------------------------
+--                                                                          --
+--                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
+--                                                                          --
+--                  S Y S T E M . O S _ P R I M I T I V E S                 --
+--                                                                          --
+--                                  S p e c                                 --
+--                                                                          --
+--                             $Revision: 1.11 $
+--                                                                          --
+--          Copyright (C) 1998-2001 Free Software Foundation, Inc.          --
+--                                                                          --
+-- 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).                                  --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This package provides low level primitives used to implement clock and
+--  delays in non tasking applications.
+
+--  The choice of the real clock/delay implementation (depending on whether
+--  tasking is involved or not) is done via soft links (see s-tasoli.ads)
+
+--  NEVER add any dependency to tasking packages here
+
+package System.OS_Primitives is
+
+   Max_Sensible_Delay : constant Duration := 183 * 24 * 60 * 60.0;
+   --  Max of half a year delay, needed to prevent exceptions for large
+   --  delay values. It seems unlikely that any test will notice this
+   --  restriction, except in the case of applications setting the clock at
+   --  at run time (see s-tastim.adb). Also note that a larger value might
+   --  cause problems (e.g overflow, or more likely OS limitation in the
+   --  primitives used).
+
+   function Clock return Duration;
+   pragma Inline (Clock);
+   --  Returns "absolute" time, represented as an offset
+   --  relative to "the Epoch", which is Jan 1, 1970 on unixes.
+   --  This implementation is affected by system's clock changes.
+
+   function Monotonic_Clock return Duration;
+   pragma Inline (Monotonic_Clock);
+   --  Returns "absolute" time, represented as an offset
+   --  relative to "the Epoch", which is Jan 1, 1970.
+   --  This clock implementation is immune to the system's clock changes.
+
+   Relative          : constant := 0;
+   Absolute_Calendar : constant := 1;
+   Absolute_RT       : constant := 2;
+   --  Values for Mode call below. Note that the compiler (exp_ch9.adb)
+   --  relies on these values. So any change here must be reflected in
+   --  corresponding changes in the compiler.
+
+   procedure Timed_Delay (Time : Duration; Mode : Integer);
+   --  Implements the semantics of the delay statement when no tasking is
+   --  used in the application.
+   --
+   --    Mode is one of the three values above
+   --
+   --    Time is a relative or absolute duration value, depending on Mode.
+   --
+   --  Note that currently Ada.Real_Time always uses the tasking run time, so
+   --  this procedure should never be called with Mode set to Absolute_RT.
+   --  This may change in future or bare board implementations.
+
+end System.OS_Primitives;