| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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; |
