[haiku-development] Re: Pthread priorities and sched.h
- From: André Braga <meianoite@xxxxxxxxx>
- To: "haiku-development@xxxxxxxxxxxxx" <haiku-development@xxxxxxxxxxxxx>
- Date: Mon, 19 Oct 2009 09:29:56 -0200
Em 18/10/2009, às 22:33, Michael Franz <mvfranz@xxxxxxxxx> escreveu:
So you are saying that for FIFO the priorities should be 100 to 120
and the RR should be 1 to 99? I can make that change.
My understanding is that POSIX provides two subclasses inside the real-
time class of priorities, one governed by round-robin and the other
governed by FIFO; however, the current BeOS priority model doesn't
provide for different scheduling policies or mechanisms depending on
the level of priority other than switching to strict priority FIFO for
real-time threads (those with numerical priorities over and including
100).
That's one of the things that the layered approach I'm using now for
the scheduler could be made to address, and also an expansion upon the
implicit scheduling classes I talked about on the old blog posts. The
posix threading calls could make use of the new APIs that will have to
be introduced to take advantage of the new features. Posix makes a
great case for introducing such an API and have it being used by a
decent number of applications while keeping full source- and binary
compatibility. Hopefully judicious use of suggest_thread_priority
would yield the same results for apps that don't have thread
priorities hardcoded (which I *hope* is the majority, but what do I
know).
Stay tuned.
Cheers,
A.
Other related posts:
