gcc/ada/s-restri.ads

   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) 2004-2006, 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 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.                                              --
  21 --                                                                          --
  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.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This package provides a run-time interface for checking the set of
  35 --  restrictions that applies to the current partition. The information
  36 --  comes both from explicit restriction pragmas present, and also from
  37 --  compile time checking.
  38
  39 --  The package simply contains an instantiation of System.Rident, but
  40 --  with names discarded, so that we do not have image tables for the
  41 --  large restriction enumeration types at run time.
  42
  43 with System.Rident;
  44
  45 package System.Restrictions is
  46    pragma Preelaborate;
  47    pragma Discard_Names;
  48    package Rident is new System.Rident;
  49
  50    Run_Time_Restrictions : Rident.Restrictions_Info;
  51    --  Restrictions as set by the user, or detected by the binder.
  52    --  Note that a restriction which is both Set and Violated at run-time means
  53    --  that the violation was detected as part of the Ada run-time and not
  54    --  as part of user code.
  55
  56    ------------------
  57    -- Subprograms --
  58    -----------------
  59
  60    function Abort_Allowed return Boolean;
  61    pragma Inline (Abort_Allowed);
  62    --  Tests to see if abort is allowed by the current restrictions settings.
  63    --  For abort to be allowed, either No_Abort_Statements must be False,
  64    --  or Max_Asynchronous_Select_Nesting must be non-zero.
  65
  66    function Tasking_Allowed return Boolean;
  67    pragma Inline (Tasking_Allowed);
  68    --  Tests to see if tasking operations are allowed by the current
  69    --  restrictions settings. For tasking to be allowed, No_Tasking
  70    --  must be False, and Max_Tasks must not be set to zero.
  71
  72 end System.Restrictions;