From: "Emanuele Novelli" <ema.novelli@gmail.com>
To: bluez-users@lists.sourceforge.net
Subject: [Bluez-users] multithread / multi process use
Date: Thu, 25 Jan 2007 11:29:52 +0100 [thread overview]
Message-ID: <80236d750701250229u61cbb820v929b8d0ad6ae3fb9@mail.gmail.com> (raw)
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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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next reply other threads:[~2007-01-25 10:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-25 10:29 Emanuele Novelli [this message]
2007-01-25 10:42 ` [Bluez-users] multithread / multi process use Marcel Holtmann
2007-01-28 2:30 ` Albert Huang
2007-01-30 14:39 ` Emanuele Novelli
2007-01-30 22:15 ` Albert Huang
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