K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2011-06-10T18:56:12.565975Z
K 7
svn:log
V 588
MFC 222032:
Fix a race in the SMP rendezvous code.  Specifically, the write by the
last CPU to to finish the rendezvous action may become visible to
different CPUs at different times.  As a result, the CPU that initiated
the rendezvous may exit the rendezvous and drop the lock allowing another
rendezvous to be initiated on the same CPU or a different CPU.  In that
case the exit sentinel may be cleared before all CPUs have noticed causing
those CPUs to hang forever.

Workaround this by using a generation count to notice when this race
occurs and to exit the rendezvous in that case.

END