add stop method

wangzhengquan

2021-02-05 607ac3ae8bfc017e10a7907e69dcbc3ab2a0fb63

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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