From: Alex Young <alex@...>
Date: 2009-10-20T23:10:15+09:00
Subject: Mutex confusion

I'm a little confused by Mutex's behaviour. It doesn't seem right that a
single thread should be able to block itself:

alex@twentyone:/tmp$ cat thread-block.rb
require 'thread'

m = Mutex.new

m.synchronize do
  m.synchronize do
    puts "Woo!"
  end
end

alex@twentyone:/tmp$ ruby thread-block.rb
thread-block.rb:6:in `synchronize': stopping only thread (ThreadError)
  note: use sleep to stop forever
  from thread-block.rb:6
  from thread-block.rb:5:in `synchronize'
  from thread-block.rb:5

Why does it behave like this? Is it traditional for mutexes (mutices?)
to be designed this way?

--
Alex
-- 
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