add center info at fixed address in shm.

lichao

2021-05-14 9bf199a4770b08c03d553129757d960b605e598a

 .vscode/settings.json

@@ -77,7 +77,9 @@
    "cmake.configureOnOpen": false,
    "C_Cpp.default.includePath": [
        "build/proto",
        "log",
        "src",
        "box"
    ]
    ],
    "terminal.integrated.cwd": "utest"
}