RFC 7231 HYPERTEXT TRANSFER PROTOCOL HTTP 1 1: SEMANTICS AND CONTENT

This may be known as from any process or thread, not onlythe process or thread which initially acquired the lock. With the block argument set to False, the method call does notblock. If the lock is currently in a locked state, return False;otherwise set the lock to a locked state and return True. If a course of is killed whereas it's attempting to