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A comment on Ruby Threads and the Global Interpreter Lock in C. Parent comment
https://github.com/ruby/ruby/tree/trunk/lib
Rubinius' one (called RubySL) also includes some rewrites of standard libraries, that were originally written in C. And as you may know, Rubinius itself is just Ruby code to some extent.
https://github.com/rubysl
mruby has some Ruby code, too. Even some parts of the core language are written in it.
https://github.com/mruby/mruby/tree/master/mrblib
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https://github.com/ruby/ruby/tree/trunk/lib
Rubinius' one (called RubySL) also includes some rewrites of standard libraries, that were originally written in C. And as you may know, Rubinius itself is just Ruby code to some extent.
https://github.com/rubysl
mruby has some Ruby code, too. Even some parts of the core language are written in it.
https://github.com/mruby/mruby/tree/master/mrblib