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If there are two slots in two different threads and these slots are connected to a signal in a third thread. Can it happen, that both slots get called at the same time by the signal or do they get called synchronized every time?
I ask because i want to send some callback data structure (encapsulated with QSharedPointer) and ask if locking mechanism inside is needed.
Have a look here (official Qt documentation for Qt’s signal/slot mechanism regarding threads).
Each slot is called inside its thread, therefore I am pretty sure anything can happen. You should install a lock mechanism.