From: Sven Van Asbroeck <thesven73@gmail.com>
To: "Enrico Weigelt, metux IT consult" <lkml@metux.net>
Cc: "Rob Herring" <robh+dt@kernel.org>,
"Linus Walleij" <linus.walleij@linaro.org>,
"Lee Jones" <lee.jones@linaro.org>,
mark.rutland@arm.com, "Andreas Färber" <afaerber@suse.de>,
treding@nvidia.com, "David Lechner" <david@lechnology.com>,
noralf@tronnes.org, johan@kernel.org,
"Michal Simek" <monstr@monstr.eu>,
michal.vokac@ysoft.com, "Arnd Bergmann" <arnd@arndb.de>,
"Greg KH" <gregkh@linuxfoundation.org>,
john.garry@huawei.com, geert+renesas@glider.be,
robin.murphy@arm.com,
"Paul Gortmaker" <paul.gortmaker@windriver.com>,
sebastien.bourdelin@savoirfairelinux.com, icenowy@aosc.io,
"Stuart Yoder" <stuyoder@gmail.com>,
"J. Kiszka" <jan.kiszka@siemens.com>,
maxime.ripard@bootlin.com,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
netdev <netdev@vger.kernel.org>
Subject: Re: [PATCH v10 0/7] Add Fieldbus subsystem + support HMS Profinet card
Date: Mon, 15 Apr 2019 14:31:45 -0400 [thread overview]
Message-ID: <CAGngYiUTHZFFY=H7xXHzZnN4pS0jAqWBTrcw04hjf5S-ykxC9w@mail.gmail.com> (raw)
In-Reply-To: <982e69c6-4e68-6f62-8bed-cd5a1802272b@metux.net>
Hi Enrico,
Thanks for your input, appreciate it !
On Mon, Apr 15, 2019 at 1:41 PM Enrico Weigelt, metux IT consult
<lkml@metux.net> wrote:
>
> AFAIK, "fieldbus" is a bit broader term than just the typical IEC61158-
> style remote memory stuff. At least that's the terminology my clients
> tend to use (eg. they also call some homebbrewn rs485-based protocols
> "fieldbus").
>
> Maybe it would be better calling it "IEC-61158" instead of "fieldbus" ?
>
Yes, we are certainly open to that, if it is more correct and/or better
accepted by users.
>
> By the way: can this device be opened/used by several processes
> simultaniously ?
>
Yes. You can open as many handles to the device as you like,
they will all share the fieldbus memory. When the remote
fieldbus memory changes, that event will be broadcast to
all open handles, via poll/select.
Of course if your application is monitoring the fieldbus memory
in more than one thread/process, you may need to guard
against race conditions. There is no guarantee which
thread/process will react to the change first.
Sven
next prev parent reply other threads:[~2019-04-15 18:31 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-09 14:42 [PATCH v10 0/7] Add Fieldbus subsystem + support HMS Profinet card Sven Van Asbroeck
2019-04-09 14:42 ` [PATCH v10 1/7] fieldbus_dev: add Fieldbus Device subsystem Sven Van Asbroeck
2019-04-16 11:13 ` Greg KH
2019-04-09 14:42 ` [PATCH v10 2/7] anybus-s: support HMS Anybus-S bus Sven Van Asbroeck
2019-04-09 14:42 ` [PATCH v10 3/7] anybus-s: support the Arcx anybus controller Sven Van Asbroeck
2019-04-09 14:42 ` [PATCH v10 4/7] dt-bindings: anybus-controller: document devicetree binding Sven Van Asbroeck
2019-04-09 15:50 ` Rob Herring
2019-04-09 17:16 ` Sven Van Asbroeck
2019-04-09 17:31 ` Sven Van Asbroeck
2019-04-09 21:09 ` Rob Herring
2019-04-10 13:11 ` Sven Van Asbroeck
2019-04-16 11:11 ` Greg KH
2019-04-09 14:42 ` [PATCH v10 5/7] dt-bindings: Add vendor prefix for arcx / Archronix Sven Van Asbroeck
2019-04-09 14:42 ` [PATCH v10 6/7] fieldbus_dev: support HMS Profinet IRT industrial controller Sven Van Asbroeck
2019-04-09 14:42 ` [PATCH v10 7/7] staging: fieldbus_dev: add TODO Sven Van Asbroeck
2019-04-15 17:41 ` [PATCH v10 0/7] Add Fieldbus subsystem + support HMS Profinet card Enrico Weigelt, metux IT consult
2019-04-15 18:31 ` Sven Van Asbroeck [this message]
2019-04-16 16:49 ` Enrico Weigelt, metux IT consult
2019-04-16 18:56 ` Sven Van Asbroeck
2019-04-16 21:18 ` Enrico Weigelt, metux IT consult
2019-04-16 21:49 ` Sven Van Asbroeck
2019-04-16 22:12 ` Sven Van Asbroeck
2019-04-18 8:32 ` Enrico Weigelt, metux IT consult
2019-04-18 17:34 ` Sven Van Asbroeck
2019-04-24 9:40 ` Enrico Weigelt, metux IT consult
2019-04-24 10:26 ` Oliver Hartkopp
2019-04-24 11:00 ` Andreas Färber
2019-04-24 11:48 ` Oliver Hartkopp
2019-04-24 15:10 ` Sven Van Asbroeck
2019-04-29 13:54 ` Enrico Weigelt, metux IT consult
2019-04-17 14:37 ` Sven Van Asbroeck
2019-04-17 17:04 ` Andreas Färber
2019-04-17 20:13 ` Enrico Weigelt, metux IT consult
2019-04-25 8:26 ` Lee Jones
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