prevents race conditions that are turning up when I'm running multiple
threads -- by allowing me to really not be running multiple threads.
Tested with the usual script.
ahead of processing data arrived on the same socket, with EnqueueKill
that adds to same queue from which data's taken. So if device dies
immediately after sending data there won't be a race between closing
the cref (if this is the last open socket) and handling the data. I'm
still dying with assert fails when running 100 games at once, but much
less frequently
(e.g. socket closes) can also be queued; track what sockets are
currently being handled so no two threads are ever processing events
on same socket. This makes running 'NGAMES=50
./scripts/discon_ok2.sh' crash very infrequently rather than every
time, but the race condition in crefmgr remains. Queuing socket
closes should help.
