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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . S Y N C H R O N O U S _ T A S K _ C O N T R O L --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2005, 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, 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. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with System.Tasking;
-- Used for Detect_Blocking
-- Self
with Ada.Exceptions;
-- Used for Raise_Exception
with System.Task_Primitives.Operations;
-- Used for Initialize
-- Finalize
-- Current_State
-- Set_False
-- Set_True
-- Suspend_Until_True
package body Ada.Synchronous_Task_Control is
----------------
-- Initialize --
----------------
procedure Initialize (S : in out Suspension_Object) is
begin
System.Task_Primitives.Operations.Initialize (S.SO);
end Initialize;
--------------
-- Finalize --
--------------
procedure Finalize (S : in out Suspension_Object) is
begin
System.Task_Primitives.Operations.Finalize (S.SO);
end Finalize;
-------------------
-- Current_State --
-------------------
function Current_State (S : Suspension_Object) return Boolean is
begin
return System.Task_Primitives.Operations.Current_State (S.SO);
end Current_State;
---------------
-- Set_False --
---------------
procedure Set_False (S : in out Suspension_Object) is
begin
System.Task_Primitives.Operations.Set_False (S.SO);
end Set_False;
--------------
-- Set_True --
--------------
procedure Set_True (S : in out Suspension_Object) is
begin
System.Task_Primitives.Operations.Set_True (S.SO);
end Set_True;
------------------------
-- Suspend_Until_True --
------------------------
procedure Suspend_Until_True (S : in out Suspension_Object) is
begin
-- This is a potentially blocking (see ARM D.10, par. 10), so that
-- if pragma Detect_Blocking is active then Program_Error must be
-- raised if this operation is called from a protected action.
if System.Tasking.Detect_Blocking
and then System.Tasking.Self.Common.Protected_Action_Nesting > 0
then
Ada.Exceptions.Raise_Exception
(Program_Error'Identity, "potentially blocking operation");
end if;
System.Task_Primitives.Operations.Suspend_Until_True (S.SO);
end Suspend_Until_True;
end Ada.Synchronous_Task_Control;
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