From: Just Another Victim of the Ambient Morality <ihatespam@...>
Date: 2008-12-23T18:21:27+09:00
Subject: Are all Ruby built-in objects thread safe?

    Are all built-in objects thread safe?  For example, if I have an array 
and one thread is constant appending to it while another thread is shifting 
elements off of it and there's no synchronization going on, can the array 
object ever get corrupted?  What about a similar scenario for hashes?  These 
are surely complicated objects with internal state that must be maintained. 
Are they implemented to be thread safe?
    Thank you...