On Monday 18 February 2008 10:25:13 am Andriy Gapon wrote: > I see that sched_4bsd has a NOP callout with a purpose of forcing a > context switch (via softclock), so that something like a preemption > could happen (e.g. for threads in a tight calculation loop). > What serves the similar purpose for sched_ule? > Or, how sched_ule deals with the issue without needing softclock's help?
It's gone in newer versions of 4BSD in HEAD actually. ULE does it by checking in sched_clock() to see if the current thread has used up its quantum. If so it sets TDF_NEEDRESCHED. -- John Baldwin _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
