[Qt-interest] changes of QByteArray in 4.4.0

[Markus.Klinik at elektrobit.com]

Hi!

There was a change in QByteArray (src/corelib/tools/qbytearray.cpp) in the
transition from release 4.3.5 to 4.4.0 that produces diffs like this, or
similar, at several places in that file:

-    x = qAtomicSetPtr(&d, x);
-    if (!x->ref.deref())
-         qFree(x);
+    if (!d->ref.deref())
+         qFree(d);
+    d = x;

It looks like a race condition was sorted out, because the pointer assignment
was moved to the end.

Does somebody remember what the problem was? I can't find anything on the
mailing list, in the task tracker or in the Changelog.

Thanks,
Markus


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