add shm_alloc_key

wangzhengquan

2020-07-30 614cfd0c968d7b156932d85a5b375ace272a6775

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ipcrm -a
rm *.txt
./test_lostdata
sort -n c.txt  > c1.txt
sort -n p.txt  > p1.txt
diff -u p1.txt c1.txt