Trouble with threads in OSX and Ruby 1.9.2

Running the following code in IRB:

t = Thread.new { loop { puts 'Hi' } }

I receive a single hi and then no more output. Only if I begin pressing the enter key do I receive output as expected until I discontinue pressing enter.

If I do t.join, everything acts as expected

The problem happe开发者_运维知识库ns in IRB, pry and ripl using ruby 1.9.2-p180 and 1.9.2-p290 under rvm 1.8.0 in OSX 10.7 and rvm 1.6.20 in OSX 10.6

readline is installed via rvm pkg install readline

Thank you for any insight

Some versions of readline on OSX are blocking. If you experience the behavior above, you can disable readline by putting

IRB.conf[:USE_READLINE] = false

in .irbrc