Re: POSIX Message Queue Priority Scheduling

[Jonathan Haws <Jonathan.Haws@sdl.usu.edu>]

You're right about that - but my thread priorities are set such that I
have one thread at priority 25, one at 30, one at 35, etc.  Each of
those ends up blocking on the mq_send at the same time.  When space
becomes available in the queue, I would expect the thread with the
highest priority to wake up and post its message.  The priority of the
message posted simply matched the priority of the thread posting so
that I could tell who posted.

I'm seeing that the thread who blocks first wakes up first, even if
they have a lower priority.  This is not as expected - I expect the
threads to wake in priority order, but that doesn't seem to be the
case.

Would it help if I sent over my test application?