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) 1992-2017, 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
with
45 procedure Initialize
(S
: in out Suspension_Object
) is
47 System
.Task_Primitives
.Operations
.Initialize
(S
.SO
);
54 procedure Finalize
(S
: in out Suspension_Object
) is
56 System
.Task_Primitives
.Operations
.Finalize
(S
.SO
);
63 function Current_State
(S
: Suspension_Object
) return Boolean is
65 return System
.Task_Primitives
.Operations
.Current_State
(S
.SO
);
72 procedure Set_False
(S
: in out Suspension_Object
) is
74 System
.Task_Primitives
.Operations
.Set_False
(S
.SO
);
81 procedure Set_True
(S
: in out Suspension_Object
) is
83 System
.Task_Primitives
.Operations
.Set_True
(S
.SO
);
86 ------------------------
87 -- Suspend_Until_True --
88 ------------------------
90 procedure Suspend_Until_True
(S
: in out Suspension_Object
) is
92 -- This is a potentially blocking (see ARM D.10, par. 10), so that
93 -- if pragma Detect_Blocking is active then Program_Error must be
94 -- raised if this operation is called from a protected action.
96 if System
.Tasking
.Detect_Blocking
97 and then System
.Tasking
.Self
.Common
.Protected_Action_Nesting
> 0
99 Ada
.Exceptions
.Raise_Exception
100 (Program_Error
'Identity, "potentially blocking operation");
103 System
.Task_Primitives
.Operations
.Suspend_Until_True
(S
.SO
);
104 end Suspend_Until_True
;
106 end Ada
.Synchronous_Task_Control
;