attempt to recusive lock a mutex deadlocks instead of throwing an error

[johnnyt]

MRI

ruby -r rubygems examples/echo_server.rb
Listening on 127.0.0.1:1234
*** 127.0.0.1:59598 connected
<internal:prelude>:8:in `lock': deadlock; recursive locking (ThreadError)
    from <internal:prelude>:8:in `synchronize'
    from /Users/johnnyt/code/celluloid/nio4r/lib/nio/selector.rb:22:in `register'
    from examples/echo_server.rb:29:in `accept'
    from examples/echo_server.rb:15:in `block in initialize'
    from examples/echo_server.rb:20:in `call'
    from examples/echo_server.rb:20:in `block in run'
    from /Users/johnnyt/code/celluloid/nio4r/lib/nio/selector.rb:94:in `block (2 levels) in select'
    from /Users/johnnyt/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/set.rb:222:in `block in each'
    from /Users/johnnyt/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/set.rb:222:in `each_key'
    from /Users/johnnyt/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/set.rb:222:in `each'
    from /Users/johnnyt/code/celluloid/nio4r/lib/nio/selector.rb:93:in `block in select'
    from <internal:prelude>:10:in `synchronize'
    from /Users/johnnyt/code/celluloid/nio4r/lib/nio/selector.rb:54:in `select'
    from examples/echo_server.rb:20:in `run'
    from examples/echo_server.rb:46:in `<main>'

MagLev

Maglev deadlocks on the recursive attempt to lock the mutex without
giving an error (i.e waits forever)