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No other classes really need direct access to QQmlTypeModulePrivate.
Adding or removing types, as well as lookup of types needs to be
protected by a mutex, as that can happen from multiple threads. However,
we don't need to acquire the global type registration mutex in order to
change the internals of some QQmlTypeModule. Rather, each type module
gets its own mutex.
The minimum and maximum versions as well as the "locked" property can be
handled with atomic integers as they only ever move in one direction.
The module and majorVersion properties are constant over the life time
of the object. Therefore they don't need any locking.
Task-number: QTBUG-73271
Change-Id: I23fe7dcaf521ccecaaaf19c1fb0436e109c42f03
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
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