Subject: Re: [Bluez-devel] Using bluez-libs for non-blocking I/O
From: Marcel Holtmann <marcel@holtmann.org>
To: bluez-devel@lists.sourceforge.net
In-Reply-To: <9307f5f205071408293075bb92@mail.gmail.com>
References: <9307f5f205071408293075bb92@mail.gmail.com>
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Date: Sun, 17 Jul 2005 15:30:31 +0200

Hi Paul,

> I've been digging the bluez mailing lists and the source code of the
> libraries for a while, but couldn't find a solution for my problem yet.
> I'm writing a bluetooth library in C++, it wraps the whole bluez-libs
> around C++ objects, I'll use it for my project of a GUI-based
> bluetooth management tool.
> Things have not been though until now, I've layed out the whole class
> hierarchy and most class member functions don't do anything but calling
> their bluez-counterpart.
> Now I wanted to implement an event-driven interface, using libsigc++
> to provide a basic callback mechanism (basically, the library gets a
> event from the hci device and dispatches it to the originating object
> trough the appropriate callback functor) but this is giving me quite
> some headaches, I'm going to have a single, separate, thread which
> does all the poll()ing stuff, I want to reuse as most of the original
> bluez library as possible, but I don't know how to make the existing
> hci_send_req() return immediately without waiting for a reply (which,
> in case of a asynchronous request, will be handled in the
> event-dispatching-thread described above), I don't want to rewrite
> hci_send_req() nor any of the many functions which rely on it, which
> could be the best solution ?

you need to use the raw HCI socket directly for this task. Examples on
how to do this have been posted to mailing list some time ago.

> Another question: the existing kernel modules and the library are able
> to handle multiple pending requests at once or am I just wasting my
> time trying to do something Bluez wasn't actually designed for ?

This depends on. For the same request, we handle it badly. For different
requests this should work.

Regards

Marcel


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