🧵 Fix deadlock in #disconnect#686
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`#disconnect` could deadlock when called inside the mutex, because the receiver thread could be signaling a condition variable and it would thus be unable to resume until the current thread releases its lock. Also, `#disconnect` shouldn't raise `IO#shutdown` exceptions on the receiver thread prior to closing the socket, when it is being called from the receiver thread. The exception is still raised, _after_ the socket is closed.
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#disconnectcould deadlock when called inside the mutex, because the receiver thread could be signaling a condition variable and it would thus be unable to resume until the current thread releases its lock.Also,
#disconnectshouldn't raiseIO#shutdownexceptions on the receiver thread prior to closing the socket, when it is being called from the receiver thread. The exception is still raised, after the socket is closed.