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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) 1992-2009, 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 3, 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. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+with Ada.Exceptions;
+
+with System.Tasking;
+with System.Task_Primitives.Operations;
+
+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;