[Interest] reference counting

[René J.V. Bertin]

On Sunday November 16 2014 18:47:34 Giuseppe D'Angelo wrote:

> Most of the value classes are implicitly shared:
> 
> http://qt-project.org/doc/qt-5/implicit-sharing.html
> 

Yes, I saw that doc (also in Qt4). What kind of sharing does this refer to - across threads and/or only across owners in a same thread?
ObjC's reference counting basically determines the lifetime of an object (and prevents the need for a "deleteLater" operator).
But the main thing I'm curious about: is this implicit sharing mechanism thread safe and if so, do you (thus) use some kind of interlocked increment/decrement of the reference counter?

Cheers,
René
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