Nikita Danilov wrote:
That returns us to the core of the problem: sched_yield() is used to
implement a synchronization primitive and non-portable assumptions are
made about its behavior: SUS defines that after sched_yield() thread
ceases to run on the CPU "until it again becomes the head of its thread
list", and "thread list" discipline is only defined for real-time
scheduling policies. E.g.,
int sched_yield(void)
{
return 0;
}
and
int sched_yield(void)
{
sleep(100);
return 0;
}
are both valid sched_yield() implementation for non-rt (SCHED_OTHER)
threads.
I think you're mistaken:
http://groups.google.com/group/comp.programming.threads/browse_frm/thread/0d4eaf3703131e86/da051ebe58976b00#da051ebe58976b00
sched_yield() is required to be supported even if priority scheduling is
not supported, and it is required to cause the calling thread (not
process) to yield the processor.
--
-- Howard Chu
Chief Architect, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc
OpenLDAP Core Team http://www.openldap.org/project/
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