From: jwesley <justin.w.smith@...>
Date: 2005-11-11T02:42:13+09:00
Subject: Thread Safety

I'm an experienced developer starting to learn Ruby.  On the whole I
think Ruby is a great language.  My concerns are with thread safety...

1) An exception is stored in a global variable, "$!". If multiple
threads have exceptions thrown, is the the thread guaranteed to get
it's own exception (not another threads) when evaluating the "$!".  (I
know there is a work around by naming the exception.)

2) Does ruby commonly use global values to pass values...which is not
thread safe (unless it's somehow "thread-local").

3) Is there any plan to use OS-level threads in Ruby 2.0?  A simple
thread example I wrote was incredibly slow and I think it was because
many "slow-to-return" OS calls were being made...

thanks,
Justin