From: Dmitry A.Kazakov <mailbox@dmitry-kazakov.de>
Subject: Aborting requeued entry calls
Date: Sat, 3 Aug 2002 00:34:20 +0200
Date: 2002-08-03T00:34:20+02:00 [thread overview]
Message-ID: <aidms0$13rsfh$1@ID-77047.news.dfncis.de> (raw)
Hi!
I have a problem and a question. Consider the following:
package Test_Abort is
protected Thing is
entry Foo_1;
entry Foo_2;
end Thing;
end Test_Abort;
------------------------
with Ada.Text_IO; use Ada.Text_IO;
package body Test_Abort is
protected body Thing is
entry Foo_1 when True is
begin
Put_Line ("Foo_1 requeues to Foo_2");
requeue Foo_2; -- w/o abort
end Foo_1;
entry Foo_2 when False is
begin
null;
end Foo_2;
end Thing;
end Test_Abort;
-------------------------
with Test_Abort; use Test_Abort;
with Ada.Text_IO; use Ada.Text_IO;
procedure Test is
begin
select
delay 1.0;
then abort
Thing.Foo_1;
end select;
Put_Line ("Why is that abortable?");
end Test;
--------------------------
The problem. From what I read about requeue with no abort I would expect
that Test should hang forever. Yet GNAT under Windows successfully
aborts Thing.Foo_1 (after it was requeued to Foo_2).
Is that OK?
If yes, then the question, if a requeued entry call may be silently removed
from the wait queue, how Thing could become aware of that? Let Foo_1
changes the state of Thing and Foo_2 restores it, then if Foo_2 get
silently aborted Thing becomes corrupted. Any solution?
Thanks.
--
Regards,
Dmitry Kazakov
www.dmitry-kazakov.de
next reply other threads:[~2002-08-02 22:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-02 22:34 Dmitry A.Kazakov [this message]
2002-08-02 15:33 ` Aborting requeued entry calls Robert A Duff
2002-08-05 13:29 ` Dmitry A. Kazakov
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