Review Request: Workaround for non-thread-safety of QDBusConnection

Thiago Macieira thiago at
Fri May 28 00:52:35 BST 2010

Em Sexta-feira 28. Maio 2010, às 01.17.47, Lubos Lunak escreveu:
>  For example, openSUSE 11.3 is now entering RC phase and that means that
> only  fixes can enter it, not features or newer non-patchlevel releases.
> Since the fix is in 1.4.0 and openSUSE is at 1.2.8 IIRC, 1.4.0 cannot
> enter openSUSE 11.3, neither now nor later. Now I know what the fix is and
> I need to know what the actual problems are to evaluate and possibly
> justify a request for exception to the rules. With the information given
> so far the fix appears to be rather risky and not even remotely worth a
> problem that has existed for quite a while and is "theoretical".

It's not theoretical. It's quite easy to run into that issue: if the mutex is 
unlocked for a callback, the other thread will not be able to send the 
message. It will fail.

I've seen krunner crashing because of this. That happens because the D-Bus 
calls are sent by several threads in response to the same event: the user 

Anyway, QtDBus is resistant to the change and wouldn't have problems with the 
patch. The problem are other bindings and low-level apps.

Thiago Macieira - thiago (AT) - thiago (AT)
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 190 bytes
Desc: This is a digitally signed message part.
URL: <>

More information about the kde-core-devel mailing list