The documentation for Julia 0.5.0 says that the lock returned by 
ReentrantLock() "is NOT threadsafe" ( see 
ReentrantLock()) .  What does that mean?  I interpret it to mean that I 
cannot safely call lock or unlock simultaneously with different threads, 
but then what good would the lock be at all?

In any case, I need a reliable mutex-style lock, but am using Julia 0.4.3 
where there is no Mutex, as far as I can tell.  Can I use ReentrantLock and 
lock and unlock?  Thanks.

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