maraidb lsof lock

 1. 

https://ephrain.net/linux-%E4%BD%BF%E7%94%A8-lsof-lslocks-fuser-%E6%8C%87%E4%BB%A4%E5%88%97%E5%87%BA%E7%9B%AE%E5%89%8D%E9%8E%96%E5%AE%9A%E4%B8%AD%E7%9A%84-file-locks/

2.

https://stackoverflow.com/questions/49179656/how-can-a-file-lock-be-checked-in-python-on-linux

3. program

https://gavv.github.io/articles/file-locks/