| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUNTIME 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 -- |
| -- -- |
| -- $Revision: 1.9 $ |
| -- -- |
| -- Copyright (C) 1992-2001 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, 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. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| |
| package body Ada.Synchronous_Task_Control is |
| |
| ------------------- |
| -- Suspension_PO -- |
| ------------------- |
| |
| protected body Suspension_Object is |
| |
| -------------- |
| -- Get_Open -- |
| -------------- |
| |
| function Get_Open return Boolean is |
| begin |
| return Open; |
| end Get_Open; |
| |
| --------------- |
| -- Set_False -- |
| --------------- |
| |
| procedure Set_False is |
| begin |
| Open := False; |
| end Set_False; |
| |
| -------------- |
| -- Set_True -- |
| -------------- |
| |
| procedure Set_True is |
| begin |
| Open := True; |
| end Set_True; |
| |
| ---------- |
| -- Wait -- |
| ---------- |
| |
| entry Wait when Open is |
| begin |
| Open := False; |
| end Wait; |
| |
| -------------------- |
| -- Wait_Exception -- |
| -------------------- |
| |
| entry Wait_Exception when True is |
| begin |
| if Wait'Count /= 0 then |
| raise Program_Error; |
| end if; |
| |
| requeue Wait; |
| end Wait_Exception; |
| |
| end Suspension_Object; |
| |
| ------------------- |
| -- Current_State -- |
| ------------------- |
| |
| function Current_State (S : Suspension_Object) return Boolean is |
| begin |
| return S.Get_Open; |
| end Current_State; |
| |
| --------------- |
| -- Set_False -- |
| --------------- |
| |
| procedure Set_False (S : in out Suspension_Object) is |
| begin |
| S.Set_False; |
| end Set_False; |
| |
| -------------- |
| -- Set_True -- |
| -------------- |
| |
| procedure Set_True (S : in out Suspension_Object) is |
| begin |
| S.Set_True; |
| end Set_True; |
| |
| ------------------------ |
| -- Suspend_Until_True -- |
| ------------------------ |
| |
| procedure Suspend_Until_True (S : in out Suspension_Object) is |
| begin |
| S.Wait_Exception; |
| end Suspend_Until_True; |
| |
| end Ada.Synchronous_Task_Control; |
