[Interest] Qt signal overhead (same thread, direct connection)

André Somers andre at familiesomers.nl
Mon Apr 25 07:53:54 CEST 2016

Op 22/04/2016 om 18:47 schreef Ben Lau:
> As long as the passed data is an implicit sharing class like 
> QByteArray, then it will be fine. Because only a pointer to the 
> contained data is passed. Data copying only happen when a function 
> write to an implicit sharing class.
That might not be as cheap as you think it is. The refcounting is done 
in a thread-save way, and that costs time. For not smallish contents, it 
may be quite a bit cheaper to just copy the data itself.


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