[Development] Qt 5 types under consideration for deprecation / removal in Qt 6

Mutz, Marc marc at kdab.com
Fri Aug 23 10:31:20 CEST 2019

On 2019-05-29 12:53, Mutz, Marc via Development wrote:
> === QWaitCondition -> std::condition_variable(_any) ===
> Plumbing that std::condition_variable can do better.

So, I've looked at QWaitCondition because I had a need to call wait() 
with a QBasicMutex instead of a QMutex, and that doesn't exist, yet. I 
was surprised about what I saw, so I have to ask:

Do I understand it correctly that the implementation of QWaitCondition 
has _another_ mutex inside?! So, two mutexes? The one users pass in and 
then the one that QWaitCondition uses internally, because it's 
pthread_cond and that needs pthread_mutex?

If that's the case, shouldn't we run, not walk, to replace our internal 
uses with std::mutex + std::condition_variable to have only one mutex?


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