D-Bus C++

[Markus Kohler]

I found a new one recently and tried to track it down. I am not sure whether it is a bug in D-Bus-C++ or (more likely) in libdbus. It looks like a deadlock. Constellation is the following:

Given:
- application APP that implements the adaptor for interface A, the proxy for interface B (with methods and signals) and uses class C (standard C++ class)
- B has, let's say, a method Create and a signal Created, i.e. in B's adaptor Create will call this-> Created to emit the signal
- adaptor class of interface A uses method Create from interface B's proxy and method M from class C
- class C implements interface B's proxy (to get notified about changes), i.e. implements callback function Created for interface B
- class C's method M calls another methods of interface B's proxy (not Create)

This constellation makes application APP hang. Because of the "circular" arrangement it may be a deadlock but I could not find out more at this moment in time.

If I disable in adaptor of interface B "this->Created" call everything works fine.

Right now I think of separating the interface of B into two interfaces one with signals and one with methods which may help.

Markus

Env:
Kubuntu 8.10
dbus 1.2.4
latest dbus-c++ from git
Linux solaris 2.6.27-11-generic #1 SMP Wed Apr 1 20:57:48 UTC 2009 i686 GNU/Linux

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