Ruby and --enable-pthread

Hi guys,

Sorry, maybe this is a simple question but what compiling ruby with
--enable-pthread actually does? Does it mean that with this option I
will have thread support in Ruby and without it there will be no
threads?

I know that enabling pthread leads to performance degradation (at least
in version 1.8.7) but without this option it seems there are still
threads enabled it ruby.

Thanks,

Denis

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