From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Marcel Holtmann To: BlueZ users In-Reply-To: <80236d750701250229u61cbb820v929b8d0ad6ae3fb9@mail.gmail.com> References: <80236d750701250229u61cbb820v929b8d0ad6ae3fb9@mail.gmail.com> Date: Thu, 25 Jan 2007 11:42:06 +0100 Message-Id: <1169721726.9197.39.camel@violet> Mime-Version: 1.0 Subject: Re: [Bluez-users] multithread / multi process use Reply-To: BlueZ users List-Id: BlueZ users List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Sender: bluez-users-bounces@lists.sourceforge.net Errors-To: bluez-users-bounces@lists.sourceforge.net Hi Emanuele, > 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 > > 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. actually this is a known bug and basically not really fixable except doing a massive rework of the HCI API. You are better off to use the D-Bus interface to get the remote names. It will automatically take of this for you and also do caching of the names. Regards Marcel ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Bluez-users mailing list Bluez-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bluez-users