queueing means for storing data requests to said main memory means by a requesting processor and for storing {HEAD ~ data} to be returned to {TAIL ~ a requesting processor} 
to be returned to
queueing means for storing data requests to said main memory means by a requesting processor and for storing { HEAD ~ data } to be returned to { TAIL ~ a requesting processor }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL