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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- 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 --
-- --
-- B o d y --
-- --
-- Copyright (C) 2014-2015, 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/>. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
with System.Parameters; use System.Parameters;
with System.Tasking.Initialization; use System.Tasking.Initialization;
with System.Task_Primitives.Operations;
package body System.Tasking.Task_Attributes is
package STPO renames System.Task_Primitives.Operations;
type Index_Info is record
Used : Boolean;
-- Used is True if a given index is used by an instantiation of
-- Ada.Task_Attributes, False otherwise.
Require_Finalization : Boolean;
-- Require_Finalization is True if the attribute requires finalization
end record;
Index_Array : array (1 .. Max_Attribute_Count) of Index_Info :=
(others => (False, False));
-- 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 (or null for an access type).
function Next_Index (Require_Finalization : Boolean) return Integer is
Self_Id : constant Task_Id := STPO.Self;
begin
Task_Lock (Self_Id);
for J in Index_Array'Range loop
if not Index_Array (J).Used then
Index_Array (J).Used := True;
Index_Array (J).Require_Finalization := Require_Finalization;
Task_Unlock (Self_Id);
return J;
end if;
end loop;
Task_Unlock (Self_Id);
raise Storage_Error with "Out of task attributes";
end Next_Index;
--------------
-- Finalize --
--------------
procedure Finalize (Index : Integer) is
Self_Id : constant Task_Id := STPO.Self;
begin
pragma Assert (Index in Index_Array'Range);
Task_Lock (Self_Id);
Index_Array (Index).Used := False;
Task_Unlock (Self_Id);
end Finalize;
--------------------------
-- Require_Finalization --
--------------------------
function Require_Finalization (Index : Integer) return Boolean is
begin
pragma Assert (Index in Index_Array'Range);
return Index_Array (Index).Require_Finalization;
end Require_Finalization;
end System.Tasking.Task_Attributes;
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