99 lines
4.4 KiB
Ada
99 lines
4.4 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- S Y S T E M . T A S K I N G . T A S K _ A T T R I B U T E S --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2014-2015, 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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-- GNARL was developed by the GNARL team at Florida State 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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with System.Parameters; use System.Parameters;
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with System.Tasking.Initialization; use System.Tasking.Initialization;
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with System.Task_Primitives.Operations;
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package body System.Tasking.Task_Attributes is
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package STPO renames System.Task_Primitives.Operations;
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type Index_Info is record
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Used : Boolean;
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-- Used is True if a given index is used by an instantiation of
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-- Ada.Task_Attributes, False otherwise.
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Require_Finalization : Boolean;
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-- Require_Finalization is True if the attribute requires finalization
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end record;
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Index_Array : array (1 .. Max_Attribute_Count) of Index_Info :=
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(others => (False, False));
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-- Note that this package will use an efficient implementation with no
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-- locks and no extra dynamic memory allocation if Attribute can fit in a
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-- System.Address type and Initial_Value is 0 (or null for an access type).
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function Next_Index (Require_Finalization : Boolean) return Integer is
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Self_Id : constant Task_Id := STPO.Self;
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begin
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Task_Lock (Self_Id);
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for J in Index_Array'Range loop
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if not Index_Array (J).Used then
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Index_Array (J).Used := True;
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Index_Array (J).Require_Finalization := Require_Finalization;
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Task_Unlock (Self_Id);
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return J;
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end if;
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end loop;
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Task_Unlock (Self_Id);
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raise Storage_Error with "Out of task attributes";
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end Next_Index;
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--------------
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-- Finalize --
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--------------
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procedure Finalize (Index : Integer) is
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Self_Id : constant Task_Id := STPO.Self;
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begin
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pragma Assert (Index in Index_Array'Range);
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Task_Lock (Self_Id);
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Index_Array (Index).Used := False;
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Task_Unlock (Self_Id);
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end Finalize;
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--------------------------
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-- Require_Finalization --
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--------------------------
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function Require_Finalization (Index : Integer) return Boolean is
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begin
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pragma Assert (Index in Index_Array'Range);
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return Index_Array (Index).Require_Finalization;
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end Require_Finalization;
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end System.Tasking.Task_Attributes;
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