Add the sync to fix the resource clear issue.

fujuntang

2021-12-09 73689afc09ce346f9eb00e02faf7f242e55dc7ee

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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