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## Problem Ahem, let's try this again. https://github.com/neondatabase/neon/pull/8110 had a spooky failure in test_multi_attach where a call to Endpoint.stop() timed out waiting for a lock, even though we can see an earlier call completing and releasing the lock. I suspect something weird is going on with the way pytest runs tests across processes, or use of asyncio perhaps. Anyway: the simplest fix is to just use a semaphore instead: if we don't lock we can't deadlock. ## Summary of changes - Make Endpoint.running a semaphore, where we add a unit to its counter when starting the process and atomically decrement it when stopping.