add sleeper, to reduce cpu usage.

lichao

2021-05-20 6b96ee857e366af317ab9dc1b6b4f9c22576e83b

 .vscode/launch.json

@@ -8,13 +8,13 @@
            "name": "g++ - Build and debug active file",
            "type": "cppdbg",
            "request": "launch",
            "program": "${workspaceFolder}/utest/utest",
            "program": "${workspaceFolder}/debug/bin/utest",
            "args": [
                "-t",
                "ReqRepTest"
                "ApiTest"
            ],
            "stopAtEntry": false,
            "cwd": "${workspaceFolder}",
            "cwd": "${workspaceFolder}/debug",
            "environment": [],
            "externalConsole": false,
            "MIMode": "gdb",