| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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 -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 1992-2001 Free Software Foundation, Inc. -- |
| -- -- |
| -- This specification is derived from the Ada Reference Manual for use with -- |
| -- GNAT. The copyright notice above, and the license provisions that follow -- |
| -- apply solely to the contents of the part following the private keyword. -- |
| -- -- |
| -- 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. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with System.OS_Interface; |
| with Ada.Finalization; |
| package Ada.Synchronous_Task_Control is |
| |
| type Suspension_Object is limited private; |
| |
| procedure Set_True (S : in out Suspension_Object); |
| |
| procedure Set_False (S : in out Suspension_Object); |
| |
| function Current_State (S : Suspension_Object) return Boolean; |
| |
| procedure Suspend_Until_True (S : in out Suspension_Object); |
| |
| private |
| |
| procedure Initialize (S : in out Suspension_Object); |
| |
| procedure Finalize (S : in out Suspension_Object); |
| |
| -- Implement with a VxWorks binary semaphore. A second semaphore |
| -- is used to avoid a race condition related to the implementation of |
| -- the STC requirement to raise Program_Error when Suspend_Until_True is |
| -- called with a task already pending on the suspension object |
| |
| type Suspension_Object is new Ada.Finalization.Controlled with record |
| Sema : System.OS_Interface.SEM_ID; |
| Mutex : System.OS_Interface.SEM_ID; |
| end record; |
| |
| end Ada.Synchronous_Task_Control; |
