131 lines
4.2 KiB
Ada
131 lines
4.2 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUNTIME COMPONENTS --
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-- --
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-- 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 --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2001 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 2, 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. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York 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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package body Ada.Synchronous_Task_Control is
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-------------------
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-- Suspension_PO --
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-------------------
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protected body Suspension_Object is
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--------------
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-- Get_Open --
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--------------
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function Get_Open return Boolean is
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begin
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return Open;
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end Get_Open;
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---------------
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-- Set_False --
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---------------
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procedure Set_False is
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begin
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Open := False;
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end Set_False;
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--------------
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-- Set_True --
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--------------
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procedure Set_True is
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begin
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Open := True;
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end Set_True;
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----------
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-- Wait --
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----------
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entry Wait when Open is
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begin
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Open := False;
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end Wait;
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--------------------
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-- Wait_Exception --
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--------------------
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entry Wait_Exception when True is
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begin
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if Wait'Count /= 0 then
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raise Program_Error;
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end if;
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requeue Wait;
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end Wait_Exception;
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end Suspension_Object;
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-------------------
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-- Current_State --
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-------------------
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function Current_State (S : Suspension_Object) return Boolean is
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begin
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return S.Get_Open;
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end Current_State;
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---------------
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-- Set_False --
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---------------
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procedure Set_False (S : in out Suspension_Object) is
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begin
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S.Set_False;
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end Set_False;
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--------------
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-- Set_True --
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--------------
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procedure Set_True (S : in out Suspension_Object) is
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begin
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S.Set_True;
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end Set_True;
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------------------------
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-- Suspend_Until_True --
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------------------------
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procedure Suspend_Until_True (S : in out Suspension_Object) is
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begin
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S.Wait_Exception;
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end Suspend_Until_True;
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end Ada.Synchronous_Task_Control;
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