--===============0158096812==
Content-Type: multipart/signed;
  boundary="nextPart1354982.pCZ0t2Hg0U";
  protocol="application/pgp-signature";
  micalg=pgp-sha1
Content-Transfer-Encoding: 7bit

--nextPart1354982.pCZ0t2Hg0U
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

Bart Van Assche wrote:
>Hello,
>
>While analyzing KDE applications with a thread checker I noticed that
>there is a serious problem in Qt3: the implementation of the class
>QShared in Qt3 is not threadsafe. This can cause spurious and hard to
>find crashes in KDE applications like Amarok that share Qt-objects
>over threads. I have contacted Trolltech about this, and Trolltech
>told me that Qt3 has reached end-of-life and that they won't fix this.
>Trolltech also told me that the KDE project keeps a collection of
>patches for Qt3. This leads to the following questions:

>* How important is Qt3 for the KDE project ? Is there still a
>significant number of people using Qt3, or will everyone switch to Qt4
>shortly ?

There can't be a wholesale switch in a short time frame. There are very=20
many installations still out there that will need at least two years to=20
switch, maybe even more.

But KDE developers are now focussing on the KDE 4 applications, which are=20
based on Qt 4. In that version, the shared classes are thread-safe (they=20
were designed from the ground up to be so).

>* If it is considered relevant to fix this kind of issue, where can I
>find the collection of Qt3 patches and how can I submit Qt3 patches ?

The collection of patches can be found in branches/qt/3.3/qt-copy/patches/=
=20
on our Subversion server. The link to websvn is:
	branches/qt/3.3/qt-copy/patches/

But amarok solved the problem in a different fashion: they make all=20
threads of theirs specific to a single processor. That avoids those race=20
conditions, up to a certain extent.

But I have to tell you: this is a bug in Amarok, not in Qt. They should be=
=20
making deep copies of all objects that will be used in a different=20
thread.

=2D-=20
=A0 Thiago Macieira =A0- =A0thiago (AT) macieira.info - thiago (AT) kde.org
=A0 =A0 PGP/GPG: 0x6EF45358; fingerprint:
=A0 =A0 E067 918B B660 DBD1 105C =A0966C 33F5 F005 6EF4 5358

--nextPart1354982.pCZ0t2Hg0U
Content-Type: application/pgp-signature; name=signature.asc 
Content-Description: This is a digitally signed message part.

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)

iD8DBQBICg/kM/XwBW70U1gRAnm0AKC8s1VnhU38MOlNKhJqrVI1Xr7ghwCgt7t4
yFZVd3GQsBMqiunY85/dlrU=
=l6zO
-----END PGP SIGNATURE-----

--nextPart1354982.pCZ0t2Hg0U--

--===============0158096812==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

 
>> Visit http://mail.kde.org/mailman/listinfo/kde-devel#unsub to unsubscribe <<

--===============0158096812==--