1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- S Y S T E M . T A S K _ I N F O -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 1992-2011, Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNAT was originally developed by the GNAT team at New York University. -- 28-- Extensive contributions were provided by Ada Core Technologies Inc. -- 29-- -- 30------------------------------------------------------------------------------ 31 32-- This package contains the definitions and routines associated with the 33-- implementation and use of the Task_Info pragma. It is specialized 34-- appropriately for targets that make use of this pragma. 35 36-- Note: the compiler generates direct calls to this interface, via Rtsfind. 37-- Any changes to this interface may require corresponding compiler changes. 38 39-- This unit may be used directly from an application program by providing 40-- an appropriate WITH, and the interface can be expected to remain stable. 41 42-- This is the VxWorks version of this package 43 44with Interfaces.C; 45 46package System.Task_Info is 47 pragma Preelaborate; 48 pragma Elaborate_Body; 49 -- To ensure that a body is allowed 50 51 ----------------------------------------- 52 -- Implementation of Task_Info Feature -- 53 ----------------------------------------- 54 55 -- The Task_Info pragma: 56 57 -- pragma Task_Info (EXPRESSION); 58 59 -- allows the specification on a task by task basis of a value of type 60 -- System.Task_Info.Task_Info_Type to be passed to a task when it is 61 -- created. The specification of this type, and the effect on the task 62 -- that is created is target dependent. 63 64 -- The Task_Info pragma appears within a task definition (compare the 65 -- definition and implementation of pragma Priority). If no such pragma 66 -- appears, then the value Unspecified_Task_Info is passed. If a pragma 67 -- is present, then it supplies an alternative value. If the argument of 68 -- the pragma is a discriminant reference, then the value can be set on 69 -- a task by task basis by supplying the appropriate discriminant value. 70 71 -- Note that this means that the type used for Task_Info_Type must be 72 -- suitable for use as a discriminant (i.e. a scalar or access type). 73 74 ------------------ 75 -- Declarations -- 76 ------------------ 77 78 subtype Task_Info_Type is Interfaces.C.int; 79 -- This is a CPU number (natural - CPUs are 0-indexed on VxWorks) 80 81 use type Interfaces.C.int; 82 83 Unspecified_Task_Info : constant Task_Info_Type := -1; 84 -- Value passed to task in the absence of a Task_Info pragma 85 -- This value means do not try to set the CPU affinity 86 87end System.Task_Info; 88