类实例线程关联是否会对其数据产生任何影响？

Question

We know from the QThread documentation

A QObject instance is said to have a thread affinity, or that it lives in a certain thread. When a QObject receives a queued signal or a posted event, the slot or event handler will run in the thread that the object lives in.

Does the thread affinity have any impact on the class instance data? Does the class data become thread data?

Apart from the above, the reason I am asking is because I want to pass a pointer/reference of another class in its constructor. If I am being object oriented, I shall not access its data directly but if I call a member function of the other class, will it also be called in this class's thread?

Answer 1

Does the thread affinity has any impact on the class data?

No, a QObject's thread affinity only controls which thread its slot and event handlers run in.

Does the class data becomes a thread data?

Class data means class static data members - that can't possibly be affected by the thread affinity of each instance. Instance data isn't somehow made thread-local either: thread-local storage can be very limited, and there's simply no reason to force every instance into it.

Apart from the above ...

If you don't issue a signal or event, normal method calls are just method calls.