From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Subject: Re: Advice, tasking and hardware
Date: Thu, 26 May 2016 12:35:04 -0700
Date: 2016-05-26T12:35:04-07:00 [thread overview]
Message-ID: <ni7iue$v9b$1@dont-email.me> (raw)
In-Reply-To: <ni68f8$1t85$1@gioia.aioe.org>
On 05/26/2016 12:26 AM, Dmitry A. Kazakov wrote:
>
> If you want interlocking for doing blocking calls use a mutex etc. A mutex
> implementation based on protected objects is two actions: Seize and Release.
To the OP: This is terrible advice. One should only use a low-level mechanism
such as a semaphore when one can't achieve what one needs with the high-level
mechanisms provided by the language: tasks and protected objects. Since there's
no way for the compiler to know that the subprogram is potentially blocking,
there's no reason not to put the call in a PO and make use of the high-level
mutual exclusion it provides. Even if the system has problems with the call
being in a protected operation, it's better to put a request for the call on a
protected queue and have a task that gets the requests from the queue and makes
the calls than to use a semaphore.
--
Jeff Carter
"This trial is a travesty. It's a travesty of a mockery of a
sham of a mockery of a travesty of two mockeries of a sham. ...
Do you realize there's not a single homosexual on that jury?"
Bananas
27
next prev parent reply other threads:[~2016-05-26 19:35 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-25 21:24 Advice, tasking and hardware patrick
2016-05-26 1:09 ` Jeffrey R. Carter
2016-05-26 8:13 ` Simon Wright
2016-05-26 7:26 ` Dmitry A. Kazakov
2016-05-26 16:41 ` patrick
2016-05-26 17:56 ` Dmitry A. Kazakov
2016-05-26 20:35 ` Jeffrey R. Carter
2016-05-26 19:35 ` Jeffrey R. Carter [this message]
2016-05-26 20:51 ` patrick
2016-05-27 7:50 ` Dmitry A. Kazakov
2016-05-27 18:00 ` Simon Wright
2016-05-27 19:06 ` Jeffrey R. Carter
2016-05-27 22:05 ` Randy Brukardt
2016-05-27 23:09 ` Jeffrey R. Carter
2016-05-27 19:13 ` Shark8
2016-05-27 20:27 ` Dmitry A. Kazakov
2016-05-27 22:27 ` Randy Brukardt
2016-05-28 6:49 ` Dmitry A. Kazakov
2016-05-28 14:38 ` Shark8
2016-05-28 15:45 ` Dmitry A. Kazakov
2016-05-28 0:25 ` rieachus
2016-05-28 1:57 ` patrick
2016-05-28 4:13 ` Jeffrey R. Carter
2016-06-01 14:37 ` rieachus
2016-06-01 19:09 ` Dmitry A. Kazakov
2016-06-06 3:33 ` rieachus
2016-06-06 7:18 ` Dmitry A. Kazakov
2016-06-07 16:53 ` rieachus
2016-06-07 20:21 ` Dmitry A. Kazakov
2016-06-08 4:06 ` rieachus
2016-06-08 7:29 ` Dmitry A. Kazakov
2016-06-08 12:56 ` rieachus
2016-06-08 0:19 ` Dennis Lee Bieber
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