From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Timeouts in Ada
Date: Fri, 25 Jul 2014 18:34:40 +0200
Date: 2014-07-25T18:34:40+02:00 [thread overview]
Message-ID: <1oq0g68ezm6b5.1142k8vxs284r$.dlg@40tude.net> (raw)
In-Reply-To: 1cbcaaba-766a-4b4d-a487-ecb77735efb2@googlegroups.com
On Fri, 25 Jul 2014 02:11:29 -0700 (PDT), AdaMagica wrote:
> On Thursday, July 24, 2014 5:37:39 PM UTC+2, Robert A Duff wrote:
>
> But this is not the same as
>
>> select
>> call_1(params);
>> or
>> call_2(params);
>> or
>> delay 10;
>> end select;
BTW, there could be any combination of counters:
select
call_1 (params);
and
call_2 (params);
or
delay 10;
end select;
Calls or makes rendezvous with two entries indivisibly.
A use case is prevention of deadlocks with mutexes:
Task 1:
select -- Acquire both or none
Resource_1.Seize;
and
Resource_2.Seize;
end select;
Task 2:
select
Resource_2.Seize;
and
Resource_1.Seize;
end select;
is safe, while
Task 1:
Resource_1.Seize;
Resource_2.Seize;
Task 2:
Resource_2.Seize;
Resource_1.Seize;
is unsafe.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2014-07-25 16:34 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-17 5:18 Timeouts in Ada NiGHTS
2014-07-17 7:08 ` Simon Wright
2014-07-17 8:35 ` NiGHTS
2014-07-21 23:34 ` Randy Brukardt
2014-07-22 1:11 ` Shark8
2014-07-22 7:39 ` J-P. Rosen
2014-07-22 8:31 ` Simon Wright
2014-07-22 21:52 ` Randy Brukardt
2014-07-17 7:38 ` J-P. Rosen
2014-07-17 8:40 ` NiGHTS
2014-07-17 10:00 ` J-P. Rosen
2014-07-17 19:27 ` Jeffrey Carter
2014-07-17 19:51 ` J-P. Rosen
2014-07-17 20:52 ` Jeffrey Carter
2014-07-17 20:29 ` Adam Beneschan
2014-07-17 20:52 ` J-P. Rosen
2014-07-21 23:44 ` Randy Brukardt
2014-07-17 20:43 ` Jeffrey Carter
2014-07-21 23:37 ` Randy Brukardt
2014-07-17 7:42 ` Dmitry A. Kazakov
2014-07-17 8:59 ` NiGHTS
2014-07-17 9:48 ` Dmitry A. Kazakov
2014-07-17 17:10 ` NiGHTS
2014-07-17 20:45 ` Dmitry A. Kazakov
2014-07-17 16:12 ` Adam Beneschan
2014-07-17 16:46 ` NiGHTS
2014-07-17 17:11 ` Simon Wright
2014-07-17 17:58 ` NiGHTS
2014-07-17 19:02 ` Jeffrey Carter
2014-07-17 18:58 ` Jeffrey Carter
2014-07-17 18:12 ` Adam Beneschan
2014-07-17 19:27 ` Jeffrey Carter
2014-07-17 18:56 ` Jeffrey Carter
2014-07-23 22:37 ` Robert A Duff
2014-07-24 9:23 ` AdaMagica
2014-07-24 15:37 ` Robert A Duff
2014-07-25 5:16 ` Randy Brukardt
2014-07-25 9:11 ` AdaMagica
2014-07-25 16:15 ` Brad Moore
2014-07-25 16:34 ` Dmitry A. Kazakov [this message]
2014-07-17 19:27 ` Jeffrey Carter
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