Add locking to setting and getting the default Logger #6398
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There's no (reasonable) way to externally guarantee that calls to Logger:get_default_logger() and Logger::set_default_logger() won't race, so they need internal locking.
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There's no (reasonable) way to externally guarantee that calls to Logger:get_default_logger() and
Logger::set_default_logger() won't race, so they need internal locking.