Why can I not writeLock after ReadLock?

David Nolden zwabel at googlemail.com
Sat Nov 13 14:00:00 UTC 2010

@Milian: As Esben said, it's semantically simply not possible. The
duchain lock is more advanced than QReadLocker, in that it allows to
acquire a read-lock while already holding a write-lock. The opposite
way is not possible though.

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