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require 'thread'
 
m = Mutex.new
m.lock
wt2 = Thread.new do
m.lock
sleep 2
m.unlock
end
 
# Ensure wt2 is waiting on m
sleep 0.1
 
wt1 = Thread.new do
m.lock
m.unlock
end
# Ensure wt1 is waiting on m
sleep 0.1
 
# Give it to wt2
 
m.unlock
 
wt1.join
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