add center info at fixed address in shm.

lichao

2021-05-14 9bf199a4770b08c03d553129757d960b605e598a

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*.un~
build/
debug/
release/
Makefile
utest/utest
*.bak
gmon.out
*/bhshmq_center
*/help
*/bhshmqbox
*/bhshmq_status
.idea