kse: high prio threads starving low prio threads
deischen at freebsd.org
Tue Jan 31 17:28:45 PST 2006
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.
> 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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