Supplementary for the fix of the lock removal.

Fu Juntang

2021-09-03 b386f0c5d35994a54e95d5fe1c4bcbfd1cdea59c

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ipcrm -a
 
./dgram_mod_req_rep server 2 & node0=$! && sleep 1
./dgram_mod_req_rep client 2 node1
kill $node0