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object.adb
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object.adb
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-- --
-- package Object.Tasking Copyright (c) Dmitry A. Kazakov --
-- Implementation Luebeck --
-- Winter, 2009 --
-- Multiple tasking version --
-- Last revision : 10:33 11 May 2019 --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU General Public License as --
-- published by the Free Software Foundation; either version 2 of --
-- the License, or (at your option) any later version. This library --
-- is distributed in the hope that it will be useful, but WITHOUT --
-- ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. You should have --
-- received a copy of the GNU General Public License along with --
-- this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from --
-- this unit, or you link this unit with other files to produce an --
-- executable, this unit does not by itself cause the resulting --
-- executable to be covered by the GNU General Public License. This --
-- exception does not however invalidate any other reasons why the --
-- executable file might be covered by the GNU Public License. --
--____________________________________________________________________--
with Ada.Exceptions; use Ada.Exceptions;
with Ada.Tags; use Ada.Tags;
with Ada.Unchecked_Deallocation;
with System; use type System.Address;
package body Object is
Decrement_Error : exception;
protected Lock is
procedure Decrement
( Object : in out Entity'Class;
New_Value : out Natural
);
procedure Increment (Object : in out Entity'Class);
private
pragma Inline (Decrement);
pragma Inline (Increment);
end Lock;
protected body Lock is
procedure Decrement
( Object : in out Entity'Class;
New_Value : out Natural
) is
begin
if Object.Use_Count = 0 then
raise Decrement_Error;
else
Object.Use_Count := Object.Use_Count - 1;
New_Value := Object.Use_Count;
end if;
end Decrement;
procedure Increment (Object : in out Entity'Class) is
begin
Object.Use_Count := Object.Use_Count + 1;
end Increment;
end Lock;
function Equal
( Left : Entity;
Right : Entity'Class;
Flag : Boolean := False
) return Boolean is
begin
if Flag or else Right in Entity then
return Left'Address = Right'Address;
else
return Equal (Right, Left, True);
end if;
end Equal;
procedure Finalize (Object : in out Entity) is
begin
if 0 /= Object.Use_Count then
Raise_Exception
( Program_Error'Identity,
( Ada.Tags.Expanded_Name (Entity'Class (Object)'Tag)
& " is still in use"
) );
end if;
end Finalize;
procedure Decrement_Count
( Object : in out Entity;
Use_Count : out Natural
) is
begin
Lock.Decrement (Object, Use_Count);
exception
when Decrement_Error =>
Raise_Exception
( Program_Error'Identity,
( Ada.Tags.Expanded_Name (Entity'Class (Object)'Tag)
& " has zero count"
) );
end Decrement_Count;
procedure Increment_Count (Object : in out Entity) is
begin
Lock.Increment (Object);
end Increment_Count;
procedure Initialize (Object : in out Entity) is
begin
null;
end Initialize;
function Less
( Left : Entity;
Right : Entity'Class;
Flag : Boolean := False
) return Boolean is
begin
if Flag or else Right in Entity then
return Left'Address < Right'Address;
else
return not ( Less (Right, Left, True)
or else
Equal (Right, Left, True)
);
end if;
end Less;
procedure Put_Traceback (Object : Entity'Class) is
begin
null;
end Put_Traceback;
procedure Release (Ptr : in out Entity_Ptr) is
procedure Free is new
Ada.Unchecked_Deallocation (Entity'Class, Entity_Ptr);
begin
if Ptr /= null then
declare
Object : Entity'Class renames Ptr.all;
Count : Natural;
begin
Decrement_Count (Object, Count);
if Count > 0 then
return;
end if;
end;
Free (Ptr);
end if;
end Release;
procedure Set_Trace_File (File : String) is
begin
null;
end Set_Trace_File;
end Object;