gcc/ada/4wexcpol.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
   4 --                                                                          --
   5 --                   A D A . E X C E P T I O N S . P O L L                  --
   6 --                (version supporting asynchronous abort test)              --
   7 --                                                                          --
   8 --                                  B o d y                                 --
   9 --                                                                          --
  10 --                             $Revision: 1.1 $
  11 --                                                                          --
  12 --          Copyright (C) 1992-2000, Free Software Foundation, Inc.         --
  13 --                                                                          --
  14 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  15 -- terms of the  GNU General Public License as published  by the Free Soft- --
  16 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  17 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  18 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  19 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  20 -- for  more details.  You should have  received  a copy of the GNU General --
  21 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  22 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  23 -- MA 02111-1307, USA.                                                      --
  24 --                                                                          --
  25 -- As a special exception,  if other files  instantiate  generics from this --
  26 -- unit, or you link  this unit with other files  to produce an executable, --
  27 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  28 -- covered  by the  GNU  General  Public  License.  This exception does not --
  29 -- however invalidate  any other reasons why  the executable file  might be --
  30 -- covered by the  GNU Public License.                                      --
  31 --                                                                          --
  32 -- GNARL was developed by the GNARL team at Florida State University.       --
  33 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  34 --                                                                          --
  35 ------------------------------------------------------------------------------
  36
  37 --  This version is for targets that do not support per-thread asynchronous
  38 --  signals. On such targets, we require compilation with the -gnatP switch
  39 --  that activates periodic polling. Then in the body of the polling routine
  40 --  we test for asynchronous abort.
  41
  42 --  NT, OS/2, HPUX/DCE and SCO currently use this file
  43
  44 with System.Soft_Links;
  45 --  used for Check_Abort_Status
  46
  47 separate (Ada.Exceptions)
  48
  49 ----------
  50 -- Poll --
  51 ----------
  52
  53 procedure Poll is
  54 begin
  55    --  Test for asynchronous abort on each poll
  56
  57    if System.Soft_Links.Check_Abort_Status.all /= 0 then
  58       raise Standard'Abort_Signal;
  59    end if;
  60 end Poll;