1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- A D A . E X C E P T I O N S . P O L L --
-- (version supporting asynchronous abort test and time slicing) --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2005, Free Software Foundation, Inc. --
-- --
-- GNARL is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNARL; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
-- This version is for targets that do not support per-thread asynchronous
-- signals or that do not handle async timers properly. On such targets, we
-- require compilation with the -gnatP switch that activates periodic polling.
-- Then in the body of the polling routine we test for asynchronous abort and
-- yield periodically.
-- This is currently used only by Interix
pragma Warnings (Off);
-- Allow withing of non-Preelaborated units in Ada 2005 mode where this
-- package will be categorized as Preelaborate. See AI-362 for details.
-- It is safe in the context of the run-time to violate the rules!
with System.Soft_Links;
-- used for Check_Abort_Status
pragma Warnings (On);
separate (Ada.Exceptions)
----------
-- Poll --
----------
procedure Poll is
begin
if Counter = 10000 then
Counter := 0;
delay 0.0;
else
Counter := Counter + 1;
end if;
-- Test for asynchronous abort on each poll
if System.Soft_Links.Check_Abort_Status.all /= 0 then
raise Standard'Abort_Signal;
end if;
end Poll;
|
