Merge branch 'master' of https://g/wangzhengquan/shmqueue

wangzhengquan

2020-07-29 e68463e61597798594611b2bfb2925da00e8d4fb

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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