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thread_variables 

        # Thread.thread_variables

(from ruby core)
---
    thr.thread_variables   -> array

---

Returns an array of the names of the thread-local variables (as
Symbols).

    thr = Thread.new do
      Thread.current.thread_variable_set(:cat, 'meow')
      Thread.current.thread_variable_set("dog", 'woof')
    end
    thr.join               #=> #<Thread:0x401b3f10 dead>
    thr.thread_variables   #=> [:dog, :cat]

Note that these are not fiber local variables.  Please see Thread#[] and
Thread#thread_variable_get for more details.

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