kse: high prio threads starving low prio threads

Kurt Miller kurt at intricatesoftware.com
Tue Jan 31 17:44:01 PST 2006

On Tuesday 31 January 2006 8:28 pm, Daniel Eischen wrote:
> On Tue, 31 Jan 2006, Kurt Miller wrote:
> > I'm working on 1.5 jdk certification on 5.4 and 6.0. One of the
> > jck tests hangs because a high priority thread that is yielding
> > is starving the lower priority threads. The following program
> > demonstrates this problem. Using libthr the program finishes.
> > Using kse hangs using all three scheduling policies.
> >
> > Is this the expected behavior of kse?
> It is the expected behavior for any POSIX threads library
> that supports SCHED_FIFO and priorities and also running
> on a system with one scheduling allocation domain (one CPU).
> libthr does not support posix priority scheduling.

Thanks for the reply. I realized that after sending the message.
The jck test is flawed and we will be appealing it with Sun.

> >
> > Is there a work-around to the starving issue?
> It is working as it should.  Recode it not to use priorities
> if that is what you want.

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