103 lines
5.1 KiB
Ada
103 lines
5.1 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S Y S T E M . T A S K _ I N F O --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2007-2020, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This package contains the definitions and routines associated with the
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-- implementation and use of the Task_Info pragma. It is specialized
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-- appropriately for targets that make use of this pragma.
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-- Note: the compiler generates direct calls to this interface, via Rtsfind.
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-- Any changes to this interface may require corresponding compiler changes.
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-- The functionality in this unit is now provided by the predefined package
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-- System.Multiprocessors and the CPU aspect. This package is obsolescent.
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-- This is the GNU/Linux version of this module
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with System.OS_Interface;
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package System.Task_Info is
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pragma Obsolescent (Task_Info, "use System.Multiprocessors and CPU aspect");
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pragma Preelaborate;
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pragma Elaborate_Body;
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-- To ensure that a body is allowed
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-- The Linux kernel provides a way to define the ideal processor to use for
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-- a given thread. The ideal processor is not necessarily the one that will
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-- be used by the OS but the OS will always try to schedule this thread to
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-- the specified processor if it is available.
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-- The Task_Info pragma:
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-- pragma Task_Info (EXPRESSION);
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-- allows the specification on a task by task basis of a value of type
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-- System.Task_Info.Task_Info_Type to be passed to a task when it is
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-- created. The specification of this type, and the effect on the task
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-- that is created is target dependent.
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-- The Task_Info pragma appears within a task definition (compare the
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-- definition and implementation of pragma Priority). If no such pragma
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-- appears, then the value Unspecified_Task_Info is passed. If a pragma
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-- is present, then it supplies an alternative value. If the argument of
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-- the pragma is a discriminant reference, then the value can be set on
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-- a task by task basis by supplying the appropriate discriminant value.
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-- Note that this means that the type used for Task_Info_Type must be
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-- suitable for use as a discriminant (i.e. a scalar or access type).
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-----------------------
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-- Thread Attributes --
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-----------------------
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subtype CPU_Set is System.OS_Interface.cpu_set_t;
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Any_CPU : constant CPU_Set := (bits => (others => True));
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No_CPU : constant CPU_Set := (bits => (others => False));
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Invalid_CPU_Number : exception;
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-- Raised when an invalid CPU mask has been specified
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-- i.e. An empty CPU set
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type Thread_Attributes is record
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CPU_Affinity : aliased CPU_Set := Any_CPU;
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end record;
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Default_Thread_Attributes : constant Thread_Attributes := (others => <>);
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type Task_Info_Type is access all Thread_Attributes;
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Unspecified_Task_Info : constant Task_Info_Type := null;
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function Number_Of_Processors return Positive;
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-- Returns the number of processors on the running host
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end System.Task_Info;
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