This example shows how to embed Ruby using different C coroutine libraries:

* libpcl    http://www.xmailserver.org/libpcl.html
* pthread   https://computing.llnl.gov/tutorials/pthreads/
* ucontext  http://www.gnu.org/s/libc/manual/html_node/System-V-contexts.html

That are initialized using two distinct stack allocation methods:

* static    The coroutine stack is baked into the shared object file.
* dynamic   The coroutine stack is allocated dynamically, at runtime.

And optionally using my ruby_bind_stack() patch for Ruby 1.9.x, if present:

* https://github.com/sunaku/ruby/compare/trunk...2294_bind_stack.patch

* http://bugs.ruby-lang.org/issues/show/2294

******************************************************************************
*   NOTE: Without the above patch, this example WILL FAIL for Ruby 1.9.x!    *
******************************************************************************

To run this example, use the provided `run.sh` script:

    sh run.sh   # displays usage info

    sh run.sh pcl static ~/.rvm/rubies/*
    sh run.sh pcl dynamic ~/.rvm/rubies/*

    sh run.sh pthread static ~/.rvm/rubies/*
    sh run.sh pthread dynamic ~/.rvm/rubies/*

    sh run.sh ucontext static ~/.rvm/rubies/*
    sh run.sh ucontext dynamic ~/.rvm/rubies/*

I hope this helps you learn how to embed Ruby inside C coroutines.  Enjoy!