This invention concerns a resource held in computer memory and {HEAD ~ multiple parallel processors} which require {TAIL ~ simultaneous access} to the resource 
require
This invention concerns a resource held in computer memory and { HEAD ~ multiple parallel processors } which require { TAIL ~ simultaneous access } to the resource
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH