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# one thread, one mutex (no contention)
require 'thread'
m = Mutex.new
r = 0
max = 2000
lmax = max * max
(1..1).map{
Thread.new{
i = 0
while i<lmax
i += 1
m.synchronize{
r += 1
}
end
}
}.each{|e|
e.join
}
raise r.to_s if r != max * max
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