1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                  S Y S T E M . R E S T R I C T I O N S                   --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 2004-2011, Free Software Foundation, Inc.         --
10--                                                                          --
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.                                     --
17--                                                                          --
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.               --
21--                                                                          --
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/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32--  This package provides a run-time interface for checking the set of
33--  restrictions that applies to the current partition. The information
34--  comes both from explicit restriction pragmas present, and also from
35--  compile time checking.
36
37--  The package simply contains an instantiation of System.Rident, but
38--  with names discarded, so that we do not have image tables for the
39--  large restriction enumeration types at run time.
40
41pragma Compiler_Unit;
42
43with System.Rident;
44
45package System.Restrictions is
46   pragma Preelaborate;
47
48   pragma Discard_Names;
49   package Rident is new System.Rident;
50
51   Run_Time_Restrictions : Rident.Restrictions_Info;
52   --  Restrictions as set by the user, or detected by the binder. See details
53   --  in package System.Rident for what restrictions are included in the list
54   --  and the format of the information.
55   --
56   --  Note that a restriction which is both Set and Violated at run-time means
57   --  that the violation was detected as part of the Ada run-time and not
58   --  as part of user code.
59
60   ------------------
61   -- Subprograms --
62   -----------------
63
64   function Abort_Allowed return Boolean;
65   pragma Inline (Abort_Allowed);
66   --  Tests to see if abort is allowed by the current restrictions settings.
67   --  For abort to be allowed, either No_Abort_Statements must be False,
68   --  or Max_Asynchronous_Select_Nesting must be non-zero.
69
70   function Tasking_Allowed return Boolean;
71   pragma Inline (Tasking_Allowed);
72   --  Tests to see if tasking operations are allowed by the current
73   --  restrictions settings. For tasking to be allowed, No_Tasking
74   --  must be False, and Max_Tasks must not be set to zero.
75
76end System.Restrictions;
77