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) 1992-2005, 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 2, 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
35 -- Used for Detect_Blocking
39 -- Used for Raise_Exception
41 with System
.Task_Primitives
.Operations
;
42 -- Used for Initialize
49 package body Ada
.Synchronous_Task_Control
is
55 procedure Initialize
(S
: in out Suspension_Object
) is
57 System
.Task_Primitives
.Operations
.Initialize
(S
.SO
);
64 procedure Finalize
(S
: in out Suspension_Object
) is
66 System
.Task_Primitives
.Operations
.Finalize
(S
.SO
);
73 function Current_State
(S
: Suspension_Object
) return Boolean is
75 return System
.Task_Primitives
.Operations
.Current_State
(S
.SO
);
82 procedure Set_False
(S
: in out Suspension_Object
) is
84 System
.Task_Primitives
.Operations
.Set_False
(S
.SO
);
91 procedure Set_True
(S
: in out Suspension_Object
) is
93 System
.Task_Primitives
.Operations
.Set_True
(S
.SO
);
96 ------------------------
97 -- Suspend_Until_True --
98 ------------------------
100 procedure Suspend_Until_True
(S
: in out Suspension_Object
) is
102 -- This is a potentially blocking (see ARM D.10, par. 10), so that
103 -- if pragma Detect_Blocking is active then Program_Error must be
104 -- raised if this operation is called from a protected action.
106 if System
.Tasking
.Detect_Blocking
107 and then System
.Tasking
.Self
.Common
.Protected_Action_Nesting
> 0
109 Ada
.Exceptions
.Raise_Exception
110 (Program_Error
'Identity, "potentially blocking operation");
113 System
.Task_Primitives
.Operations
.Suspend_Until_True
(S
.SO
);
114 end Suspend_Until_True
;
116 end Ada
.Synchronous_Task_Control
;