title: Why do I need to SEM_PRIORITY_Q when using a VxWorks inversion safe mutex?
body: <p>In VxWorks, I am creating a mutex with the SEM_INVERSION_SAFE option, to protect against the priority inversion problem.<br>
  The manual says that I <strong>must</strong> also use the SEM_PRIORITY_Q option.  Why is that?</p>