Right way to avoid 100% cpu on main thread



  • On main thread there a loop waiting for different things to happen.
    If i do this:

    while(...) { qApp->processEvents(); } gui responds but cpu is stucked to 100%

    If i do this:

    while(..) { qApp->processEvents(); QThread::sleep(0); } gui responds but cpu is stucked to 25%.

    Which is the right way to get a low cpu usage in an empty loop keeping app responsive?

    Thanks in advance,
    A.


  • Qt Champions 2017

    hi @trikko

    the correct way is to react to a signal in a slot instead of using wait loops (at least in main thread).

    what exactly are you waiting for?


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