From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <4f9823290809212308h7ba27f0cr7d4e88c67d38b097@mail.gmail.com> Date: Mon, 22 Sep 2008 08:08:34 +0200 From: "Reto Bachmann" To: "BlueZ development" In-Reply-To: <89b6ba3a0809190118h1b85dcd7y9fc7dcf89fab09ee@mail.gmail.com> MIME-Version: 1.0 References: <4f9823290809180242j56115a6es3a77ffa21eabbf0a@mail.gmail.com> <1221757910.6782.17.camel@californication> <4f9823290809182356x2ad1386bn3de0ebb6ada66789@mail.gmail.com> <89b6ba3a0809190118h1b85dcd7y9fc7dcf89fab09ee@mail.gmail.com> Subject: Re: [Bluez-devel] What happens with bluetooth when connection is interrupted Reply-To: BlueZ development List-Id: BlueZ development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1272402424056023227==" Errors-To: bluez-devel-bounces@lists.sourceforge.net --===============1272402424056023227== Content-Type: multipart/alternative; boundary="----=_Part_9764_21083190.1222063714357" ------=_Part_9764_21083190.1222063714357 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Hi Patryk, i see the problems and I will change it. I now made some tests and i found out that the library waits for a specific time until it sends the signal. I suppose that in this time it tries to repair the connection. Is it possible to manage this time period with compiling flags or something? Thanks, Reto 2008/9/19 Patryk Zawadzki > On Fri, Sep 19, 2008 at 8:56 AM, Reto Bachmann > wrote: > > So I need to connect the D-Bus signal RemoteDeviceDisconnected to find > out > > that I am not connected anymore? > > > > Why shouldn't I poll for a status? Is it just because a signal is sent > > either way or is the status i ask for not the true status? > > Because polling is the worst strategy both CPU- and power-wise. It > causes frequent wakeups that waste power and prevent CPUs from > entering a deep idle state. They also generate unnecessary traffic for > the IPC mechanism so if every program decided to poll for something > once a second, services like DBus would likely get hosed. > > -- > Patryk Zawadzki > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's > challenge > Build the coolest Linux based applications with Moblin SDK & win great > prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Bluez-devel mailing list > Bluez-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bluez-devel > ------=_Part_9764_21083190.1222063714357 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline
Hi Patryk,

i see the problems and I will change it. I now made some tests and i found out that the library waits for a specific time until it sends the signal. I suppose that in this time it tries to repair the connection.

Is it possible to manage this time period with compiling flags or something?

Thanks,
Reto

2008/9/19 Patryk Zawadzki <patrys@pld-linux.org>
On Fri, Sep 19, 2008 at 8:56 AM, Reto Bachmann <reto.bachmann@gmail.com> wrote:
> So I need to connect the D-Bus signal RemoteDeviceDisconnected to find out
> that I am not connected anymore?
>
> Why shouldn't I poll for a status? Is it just because a signal is sent
> either way or is the status i ask for not the true status?

Because polling is the worst strategy both CPU- and power-wise. It
causes frequent wakeups that waste power and prevent CPUs from
entering a deep idle state. They also generate unnecessary traffic for
the IPC mechanism so if every program decided to poll for something
once a second, services like DBus would likely get hosed.

--
Patryk Zawadzki

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