1 ------------------------------------------------------------------------------
3 -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- A D A . E X C E P T I O N S . P O L L --
6 -- (version supporting asynchronous abort test and time slicing) --
11 -- Copyright (C) 1992-2000, Free Software Foundation, Inc. --
13 -- GNARL is free software; you can redistribute it and/or modify it under --
14 -- terms of the GNU General Public License as published by the Free Soft- --
15 -- ware Foundation; either version 2, or (at your option) any later ver- --
16 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
17 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
18 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
19 -- for more details. You should have received a copy of the GNU General --
20 -- Public License distributed with GNARL; see file COPYING. If not, write --
21 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
22 -- MA 02111-1307, USA. --
24 -- As a special exception, if other files instantiate generics from this --
25 -- unit, or you link this unit with other files to produce an executable, --
26 -- this unit does not by itself cause the resulting executable to be --
27 -- covered by the GNU General Public License. This exception does not --
28 -- however invalidate any other reasons why the executable file might be --
29 -- covered by the GNU Public License. --
31 -- GNARL was developed by the GNARL team at Florida State University. It is --
32 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
33 -- State University (http://www.gnat.com). --
35 ------------------------------------------------------------------------------
37 -- This version is for targets that do not support per-thread asynchronous
38 -- signals or that do not handle async timers properly. On such targets, we
39 -- require compilation with the -gnatP switch that activates periodic polling.
40 -- Then in the body of the polling routine we test for asynchronous abort and
41 -- yield periodically.
43 -- HP-UX and SCO currently use this file
45 with System
.Soft_Links
;
46 -- used for Check_Abort_Status
48 separate (Ada
.Exceptions
)
56 if Counter
= 10000 then
60 Counter
:= Counter
+ 1;
63 -- Test for asynchronous abort on each poll
65 if System
.Soft_Links
.Check_Abort_Status
.all /= 0 then
66 raise Standard
'Abort_Signal;