This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.

priority= 

        # Thread.priority=

(from ruby core)
---
    thr.priority= integer   -> thr

---

Sets the priority of *thr* to *integer*. Higher-priority threads will
run more frequently than lower-priority threads (but lower-priority
threads can also run).

This is just hint for Ruby thread scheduler.  It may be ignored on some
platform.

    count1 = count2 = 0
    a = Thread.new do
          loop { count1 += 1 }
        end
    a.priority = -1

    b = Thread.new do
          loop { count2 += 1 }
        end
    b.priority = -2
    sleep 1   #=> 1
    count1    #=> 622504
    count2    #=> 5832

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.