------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                 S Y S T E M . P R O G R A M  _  I N F O                  --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--          Copyright (C) 1997-2005 Free Software Foundation, Inc.          --
--                                                                          --
-- 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 2,  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.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT;  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.                                      --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

--  This package contains the definitions and routines used as parameters
--  to the run-time system at program startup for the SGI implementation.

package System.Program_Info is
   pragma Preelaborate;

   function Initial_Sproc_Count return Integer;
   --  The number of sproc created at program startup for scheduling
   --  threads.

   function Max_Sproc_Count return Integer;
   --  The maximum number of sprocs that can be created by the program
   --  for servicing threads.  This limit includes both the pre-created
   --  sprocs and those explicitly created under program control.

   function Sproc_Stack_Size return Integer;
   --  The size, in bytes, of the sproc's initial stack.

   function Default_Time_Slice  return Duration;
   --  The default time quanta for round-robin scheduling of threads of
   --  equal priority.  This default value can be overridden on a per-task
   --  basis by specifying an alternate value via the implementation-defined
   --  Task_Info pragma. See s-tasinf.ads for more information.

   function Default_Task_Stack return Integer;
   --  The default stack size for each created thread.  This default value
   --  can be overriden on a per-task basis by the language-defined
   --  Storage_Size pragma.

   function Stack_Guard_Pages return Integer;
   --  The number of non-writable, guard pages to append to the bottom of
   --  each thread's stack.

   function Pthread_Sched_Signal return Integer;
   --  The signal used by the Pthreads library to affect scheduling actions
   --  in remote sprocs.

   function Pthread_Arena_Size return Integer;
   --  The size of the shared arena from which pthread locks are allocated.
   --  See the usinit(3p) man page for more information on shared arenas.

   function Os_Default_Priority return Integer;
   --  The default Irix Non-Degrading priority for each sproc created to
   --  service threads.

end System.Program_Info;