ThreadSafe::Util::CheapLockable

Provides a cheapest possible (mainly in terms of memory usage) Mutex with the ConditionVariable bundled in.

Usage:

class A
  include CheapLockable

  def do_exlusively
    cheap_synchronize { yield }
  end

  def wait_for_something
    cheap_synchronize do
      cheap_wait until resource_available?
      do_something
      cheap_broadcast # wake up others
    end
  end
end

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