1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
5 -- 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 --
9 -- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
35 with System.Task_Primitives.Operations;
37 package body Ada.Synchronous_Task_Control is
43 procedure Initialize (S : in out Suspension_Object) is
45 System.Task_Primitives.Operations.Initialize (S.SO);
52 procedure Finalize (S : in out Suspension_Object) is
54 System.Task_Primitives.Operations.Finalize (S.SO);
61 function Current_State (S : Suspension_Object) return Boolean is
63 return System.Task_Primitives.Operations.Current_State (S.SO);
70 procedure Set_False (S : in out Suspension_Object) is
72 System.Task_Primitives.Operations.Set_False (S.SO);
79 procedure Set_True (S : in out Suspension_Object) is
81 System.Task_Primitives.Operations.Set_True (S.SO);
84 ------------------------
85 -- Suspend_Until_True --
86 ------------------------
88 procedure Suspend_Until_True (S : in out Suspension_Object) is
90 -- This is a potentially blocking (see ARM D.10, par. 10), so that
91 -- if pragma Detect_Blocking is active then Program_Error must be
92 -- raised if this operation is called from a protected action.
94 if System.Tasking.Detect_Blocking
95 and then System.Tasking.Self.Common.Protected_Action_Nesting > 0
97 Ada.Exceptions.Raise_Exception
98 (Program_Error'Identity, "potentially blocking operation");
101 System.Task_Primitives.Operations.Suspend_Until_True (S.SO);
102 end Suspend_Until_True;
104 end Ada.Synchronous_Task_Control;