91 lines
4.5 KiB
Ada
91 lines
4.5 KiB
Ada
|
------------------------------------------------------------------------------
|
||
|
-- --
|
||
|
-- 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. --
|
||
|
-- --
|
||
|
------------------------------------------------------------------------------
|
||
|
|
||
|
-- 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;
|