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) --
10 -- Copyright (C) 1992-2000, Free Software Foundation, Inc. --
12 -- GNARL is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNARL; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNARL was developed by the GNARL team at Florida State University. --
31 -- Extensive contributions were provided by Ada Core Technologies Inc. --
33 ------------------------------------------------------------------------------
35 -- This version is for targets that do not support per-thread asynchronous
36 -- signals or that do not handle async timers properly. On such targets, we
37 -- require compilation with the -gnatP switch that activates periodic polling.
38 -- Then in the body of the polling routine we test for asynchronous abort and
39 -- yield periodically.
41 -- HP-UX and SCO currently use this file
43 with System
.Soft_Links
;
44 -- used for Check_Abort_Status
46 separate (Ada
.Exceptions
)
54 if Counter
= 10000 then
58 Counter
:= Counter
+ 1;
61 -- Test for asynchronous abort on each poll
63 if System
.Soft_Links
.Check_Abort_Status
.all /= 0 then
64 raise Standard
'Abort_Signal;