93 lines
4.9 KiB
Ada
93 lines
4.9 KiB
Ada
|
------------------------------------------------------------------------------
|
||
|
|
-- --
|
||
|
|
-- GNAT RUN-TIME COMPONENTS --
|
||
|
|
-- --
|
||
|
|
-- A D A . T A S K _ A T T R I B U T E S --
|
||
|
|
-- --
|
||
|
|
-- S p e c --
|
||
|
|
-- --
|
||
|
|
-- Copyright (C) 2014, Free Software Foundation, Inc. --
|
||
|
|
-- --
|
||
|
|
-- This specification is derived from the Ada Reference Manual for use with --
|
||
|
|
-- GNAT. The copyright notice above, and the license provisions that follow --
|
||
|
|
-- apply solely to the contents of the part following the private keyword. --
|
||
|
|
-- --
|
||
|
|
-- 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. --
|
||
|
|
-- --
|
||
|
|
------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
with Ada.Task_Identification;
|
||
|
|
|
||
|
|
generic
|
||
|
|
type Attribute is private;
|
||
|
|
Initial_Value : Attribute;
|
||
|
|
|
||
|
|
package Ada.Task_Attributes is
|
||
|
|
|
||
|
|
-- Note that this package will use an efficient implementation with no
|
||
|
|
-- locks and no extra dynamic memory allocation if Attribute can fit in a
|
||
|
|
-- System.Address type, and Initial_Value is 0 (null for an access type).
|
||
|
|
|
||
|
|
-- Other types and initial values are supported, but will require
|
||
|
|
-- the use of locking and a level of indirection (meaning extra dynamic
|
||
|
|
-- memory allocation).
|
||
|
|
|
||
|
|
-- The maximum number of task attributes supported by this implementation
|
||
|
|
-- is determined by the constant System.Parameters.Max_Attribute_Count.
|
||
|
|
-- If you exceed this number, Storage_Error will be raised during the
|
||
|
|
-- elaboration of the instantiation of this package.
|
||
|
|
|
||
|
|
type Attribute_Handle is access all Attribute;
|
||
|
|
|
||
|
|
function Value
|
||
|
|
(T : Ada.Task_Identification.Task_Id :=
|
||
|
|
Ada.Task_Identification.Current_Task) return Attribute;
|
||
|
|
-- Return the value of the corresponding attribute of T. Tasking_Error
|
||
|
|
-- is raised if T is terminated and Program_Error will be raised if T
|
||
|
|
-- is Null_Task_Id.
|
||
|
|
|
||
|
|
function Reference
|
||
|
|
(T : Ada.Task_Identification.Task_Id :=
|
||
|
|
Ada.Task_Identification.Current_Task) return Attribute_Handle;
|
||
|
|
-- Return an access value that designates the corresponding attribute of
|
||
|
|
-- T. Tasking_Error is raised if T is terminated and Program_Error will be
|
||
|
|
-- raised if T is Null_Task_Id.
|
||
|
|
|
||
|
|
procedure Set_Value
|
||
|
|
(Val : Attribute;
|
||
|
|
T : Ada.Task_Identification.Task_Id :=
|
||
|
|
Ada.Task_Identification.Current_Task);
|
||
|
|
-- Finalize the old value of the attribute of T and assign Val to that
|
||
|
|
-- attribute. Tasking_Error is raised if T is terminated and Program_Error
|
||
|
|
-- will be raised if T is Null_Task_Id.
|
||
|
|
|
||
|
|
procedure Reinitialize
|
||
|
|
(T : Ada.Task_Identification.Task_Id :=
|
||
|
|
Ada.Task_Identification.Current_Task);
|
||
|
|
-- Same as Set_Value (Initial_Value, T). Tasking_Error is raised if T is
|
||
|
|
-- terminated and Program_Error will be raised if T is Null_Task_Id.
|
||
|
|
|
||
|
|
private
|
||
|
|
pragma Inline (Value);
|
||
|
|
pragma Inline (Reference);
|
||
|
|
pragma Inline (Set_Value);
|
||
|
|
pragma Inline (Reinitialize);
|
||
|
|
end Ada.Task_Attributes;
|