141 lines
5.3 KiB
Ada
141 lines
5.3 KiB
Ada
------------------------------------------------------------------------------
|
|
-- --
|
|
-- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
|
|
-- --
|
|
-- S Y S T E M . T A S K I N G . P R O T E C T E D _ O B J E C T S --
|
|
-- --
|
|
-- B o d y --
|
|
-- --
|
|
-- Copyright (C) 1991-2001 Florida State University --
|
|
-- --
|
|
-- GNARL 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 2, or (at your option) any later ver- --
|
|
-- sion. GNARL 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. See the GNU General Public License --
|
|
-- for more details. You should have received a copy of the GNU General --
|
|
-- Public License distributed with GNARL; see file COPYING. If not, write --
|
|
-- to the Free Software Foundation, 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. --
|
|
-- --
|
|
-- GNARL was developed by the GNARL team at Florida State University. It is --
|
|
-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
|
|
-- State University (http://www.gnat.com). --
|
|
-- --
|
|
------------------------------------------------------------------------------
|
|
|
|
pragma Polling (Off);
|
|
-- Turn off polling, we do not want ATC polling to take place during
|
|
-- tasking operations. It causes infinite loops and other problems.
|
|
|
|
with System.Task_Primitives.Operations;
|
|
-- used for Write_Lock
|
|
-- Unlock
|
|
|
|
with System.Parameters;
|
|
-- used for Runtime_Traces
|
|
|
|
with System.Traces;
|
|
-- used for Send_Trace_Info
|
|
|
|
package body System.Tasking.Protected_Objects is
|
|
|
|
use System.Task_Primitives.Operations;
|
|
use System.Traces;
|
|
|
|
-------------------------
|
|
-- Finalize_Protection --
|
|
-------------------------
|
|
|
|
procedure Finalize_Protection (Object : in out Protection) is
|
|
begin
|
|
Finalize_Lock (Object.L'Unrestricted_Access);
|
|
end Finalize_Protection;
|
|
|
|
---------------------------
|
|
-- Initialize_Protection --
|
|
---------------------------
|
|
|
|
procedure Initialize_Protection
|
|
(Object : Protection_Access;
|
|
Ceiling_Priority : Integer)
|
|
is
|
|
Init_Priority : Integer := Ceiling_Priority;
|
|
begin
|
|
if Init_Priority = Unspecified_Priority then
|
|
Init_Priority := System.Priority'Last;
|
|
end if;
|
|
|
|
Initialize_Lock (Init_Priority, Object.L'Access);
|
|
Object.Ceiling := System.Any_Priority (Init_Priority);
|
|
end Initialize_Protection;
|
|
|
|
----------
|
|
-- Lock --
|
|
----------
|
|
|
|
procedure Lock (Object : Protection_Access) is
|
|
Ceiling_Violation : Boolean;
|
|
begin
|
|
-- The lock is made without defering abortion.
|
|
|
|
-- Therefore the abortion has to be deferred before calling this
|
|
-- routine. This means that the compiler has to generate a Defer_Abort
|
|
-- call before the call to Lock.
|
|
|
|
-- The caller is responsible for undeferring abortion, and compiler
|
|
-- generated calls must be protected with cleanup handlers to ensure
|
|
-- that abortion is undeferred in all cases.
|
|
|
|
Write_Lock (Object.L'Access, Ceiling_Violation);
|
|
|
|
if Parameters.Runtime_Traces then
|
|
Send_Trace_Info (PO_Lock);
|
|
end if;
|
|
|
|
if Ceiling_Violation then
|
|
raise Program_Error;
|
|
end if;
|
|
end Lock;
|
|
|
|
--------------------
|
|
-- Lock_Read_Only --
|
|
--------------------
|
|
|
|
procedure Lock_Read_Only (Object : Protection_Access) is
|
|
Ceiling_Violation : Boolean;
|
|
begin
|
|
Read_Lock (Object.L'Access, Ceiling_Violation);
|
|
|
|
if Parameters.Runtime_Traces then
|
|
Send_Trace_Info (PO_Lock);
|
|
end if;
|
|
|
|
if Ceiling_Violation then
|
|
raise Program_Error;
|
|
end if;
|
|
end Lock_Read_Only;
|
|
|
|
------------
|
|
-- Unlock --
|
|
------------
|
|
|
|
procedure Unlock (Object : Protection_Access) is
|
|
begin
|
|
Unlock (Object.L'Access);
|
|
|
|
if Parameters.Runtime_Traces then
|
|
Send_Trace_Info (PO_Unlock);
|
|
end if;
|
|
end Unlock;
|
|
|
|
end System.Tasking.Protected_Objects;
|