Is Logger thread safe?

Hi, in my program I use threads and a Logger instante accessible from any
thread. Must I do something to make the Logger thread safe?

I've looked at the Logger code and it seems that it uses Mutex in some methods
and does a:
  require 'monitor'

Is then Logger class thread safe and I can call its methods (@logger.debug...)
from any thread in parallel safely?

Thanks.

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Iñaki Baz Castillo