Re: [dbus-cplusplus-devel] Odd hangs on futex() after method calls return

[Andreas V. <li...@br...>]

Am Sat, 01 May 2010 15:15:34 -0700 schrieb Dana Goyette:

Hello Dana,

I also played around with bluez some month ago and had no problems so
far. As far as I remember I got a phone book list from the mobile. This
use cases worked.

Which use case did you try?

Could you please add this bug here:

https://sourceforge.net/tracker/?group_id=236997&atid=1101682

regards
	Andreas

> I'm trying to use the DBus-C++ libraries to talk to bluez, and I'm 
> finding that the dbus-c++ library keeps hanging on some futex even
> after strace shows it successfully receiving all expected data.
> Sometimes it hangs on calling DBus::ObjectProxy()... and other times
> it hangs on calling GetProperties() for an object that was just
> constructed.
> 
> I have attached a log of gdb and strace -- however, due to the 
> "Heisenbug" behavior under gdb and strace, the two logs do not show
> the exact same hang.  Most notably, strace itself seems to sometimes
> fix the behavior.
> 
> Device::Device(DBus::Connection* connection, const ::DBus::Path&
> path, Adapter* adapter, Manager * manager, map < string,
> DBus::Variant> properties)
>       : ::org::bluez::Device_proxy()
>       , DBus::ObjectProxy(*connection, path, "org.bluez") <-- this is 
> device.cpp, line 22.
> 
> If anyone has any advice for how to fix this hang, I would greatly 
> appreciate it.  My libdbus-c++ package version is 0~20090907-1 on
> 64-bit Ubuntu Lucid -- but I've now also manually built and installed
> the "Unofficial GIT Variant" at 
> git://gitorious.org/dbus-cplusplus/mainline.git .
> 
> Additionally, does anyone know how to set a shorter timeout for
> method calls?  The only "set" method I can find takes an
> undocumented, private "Timeout::Internal" class.
> 
> Thanks for any help you can give.
> -- Dana
>