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Date: Sat, 27 Jan 2007 21:30:34 -0500
From: "Albert Huang" <albert@csail.mit.edu>
To: "BlueZ users" <bluez-users@lists.sourceforge.net>
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Subject: Re: [Bluez-users] multithread / multi process use
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I think the proper thing to do here is to have your application use
the D-Bus API, which should do the right thing across multiple
processes.  Maybe someone else who's more in touch with hcid can give
more details.

-albert

On 1/25/07, Emanuele Novelli <ema.novelli@gmail.com> wrote:
> Hello I'm new here, I searched for this issue but found nothing.
>
> Using 2 threads or 2 process for reading a name of a 2 remote devices at
> same time reports always the same name.
> Is this a bug or the hci functions in library do not support concurrent use
> ?
> (using 2.6.19 kernel on FC6 and bluez libs 3.7.1)
>
> This is a simply way to reproduce this:
>
> open a 2 shells and issue 2 commands at same time
>
> hcitool name <bdaddress of a device close to you>
>
> they both report the same name
>
> here an HCI dump of what's happening
>
> 2007-01-25 11:15:06.093319 < HCI Command: Remote Name Request (0x01|0x0019)
> plen 10
>     bdaddr 00:0A:28:DF:2B:D8 mode 2 clkoffset 0x0000
> 2007-01-25 11:15:06.114456 > HCI Event: Command Status (0x0f) plen 4
>     Remote Name Request (0x01|0x0019) status 0x00 ncmd 1
> 2007-01-25 11:15:06.712794 < HCI Command: Remote Name Request (0x01|0x0019)
> plen 10
>     bdaddr 00:17:4B:D3:9F:5B mode 2 clkoffset 0x0000
> 2007-01-25 11:15:06.717442 > HCI Event: Command Status (0x0f) plen 4
>     Remote Name Request (0x01|0x0019) status 0x00 ncmd 0
> 2007-01-25 11:15:07.238429 > HCI Event: Remote Name Req Complete (0x07) plen
> 255
>     status 0x00 bdaddr 00:0A:28:DF:2B:D8 name 'Seleso'
> 2007-01-25 11:15:07.239434 > HCI Event: Command Status (0x0f) plen 4
>     Unknown (0x00|0x0000) status 0x00 ncmd 1
> 2007-01-25 11:15:10.151342 > HCI Event: Remote Name Req Complete (0x07) plen
> 255
>     status 0x00 bdaddr 00:17:4B:D3:9F:5B name 'Wince'
>
> the second event with the second name is tracked but never reported back to
> the caller cause the unknown event received.
> so i see the name 'Seleso' as result on both the shells
>
> this is the behaviour if I use the 2 command sequentially they works fine.
>
> hcitool name 00:0A:28:DF:2B:D8
>
> 2007-01-25 11:19:51.930394 < HCI Command: Remote Name Request (0x01|0x0019)
> plen 10
>     bdaddr 00:0A:28:DF:2B:D8 mode 2 clkoffset 0x0000
> 2007-01-25 11:19:51.951520 > HCI Event: Command Status (0x0f) plen 4
>     Remote Name Request (0x01|0x0019) status 0x00 ncmd 1
> 2007-01-25 11:19:52.199514 > HCI Event: Remote Name Req Complete (0x07) plen
> 255
>     status 0x00 bdaddr 00:0A:28:DF:2B:D8 name 'Seleso'
>
> hcitool name 00:17:4B:D3:9F:5B
>
> 2007-01-25 11:20:39.520967 < HCI Command: Remote Name Request (0x01|0x0019)
> plen 10
>     bdaddr 00:17:4B:D3:9F:5B mode 2 clkoffset 0x0000
> 2007-01-25 11:20:39.542195 > HCI Event: Command Status (0x0f) plen 4
>     Remote Name Request (0x01|0x0019) status 0x00 ncmd 1
> 2007-01-25 11:20:43.358090 > HCI Event: Remote Name Req Complete (0x07) plen
> 255
>     status 0x00 bdaddr 00:17:4B:D3:9F:5B name 'Wince'
>
>
>
>
> Since I need to use search names and search services (FAX especially) on a
> multi-threaded application i'd like to know if is this possible or somewhere
> there is a issue that prevent this.
>
>
>
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