Lock not take effect while being used in test run parallelly.

Hi, I was trying to run some test cases that needs to be run with resource exclusive while others in parallel execution. The way I prevent each worker process to access the resource is putting a lock by using python's Lock object, like:

lock.acquire() #do something exclusive lock.release()
the lock is created either in a session wide fixture or global variable in the .py file, but neither take effect. I was wonder if lock itself work with x-dist?

Start by reproducing the reported behavior with pytest-xdist and Python's Lock across parallel workers, using the session-wide fixture or module-level global described in the issue. Trace how workers are created and how fixtures are initialized, then establish whether the lock can be shared between processes. Done means the behavior is explained and, if appropriate, covered by a regression test or documented limitation.