Each node of the queue holds a reference to a task that may be concurrently performed by multiple thread execution units, but each on {HEAD ~ a different subset} of {TAIL ~ data} 
of
Each node of the queue holds a reference to a task that may be concurrently performed by multiple thread execution units , but each on { HEAD ~ a different subset } of { TAIL ~ data }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL