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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                     S Y S T E M . T A S K _ I N F O                      --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2009, 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 3,  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.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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--  This package contains the definitions and routines associated with the

--  implementation and use of the Task_Info pragma. It is specialized

--  appropriately for targets that make use of this pragma.

--  Note: the compiler generates direct calls to this interface, via Rtsfind.

--  Any changes to this interface may require corresponding compiler changes.

--  This unit may be used directly from an application program by providing

--  an appropriate WITH, and the interface can be expected to remain stable.

--  This is the VxWorks version of this package

with Interfaces.C;

package System.Task_Info is

   pragma Preelaborate;

   pragma Elaborate_Body;

   --  To ensure that a body is allowed

   -----------------------------------------

   -- Implementation of Task_Info Feature --

   -----------------------------------------

   --  The Task_Info pragma:

   --    pragma Task_Info (EXPRESSION);

   --  allows the specification on a task by task basis of a value of type

   --  System.Task_Info.Task_Info_Type to be passed to a task when it is

   --  created. The specification of this type, and the effect on the task

   --  that is created is target dependent.

   --  The Task_Info pragma appears within a task definition (compare the

   --  definition and implementation of pragma Priority). If no such pragma

   --  appears, then the value Unspecified_Task_Info is passed. If a pragma

   --  is present, then it supplies an alternative value. If the argument of

   --  the pragma is a discriminant reference, then the value can be set on

   --  a task by task basis by supplying the appropriate discriminant value.

   --  Note that this means that the type used for Task_Info_Type must be

   --  suitable for use as a discriminant (i.e. a scalar or access type).

   ------------------

   -- Declarations --

   ------------------

   subtype Task_Info_Type is Interfaces.C.int;

   --  This is a CPU number (positive)

   Any_CPU : constant Task_Info_Type := 0;

   --  Allow task to run on any CPU

   use type Interfaces.C.int;

   Unspecified_Task_Info : constant Task_Info_Type := -1;

   --  Value passed to task in the absence of a Task_Info pragma

   --  This value means do not try to set the CPU affinity

end System.Task_Info;