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# two threads, two mutex, two condvar ping-pong
require 'thread'
m1 = Thread::Mutex.new
m2 = Thread::Mutex.new
cv1 = Thread::ConditionVariable.new
cv2 = Thread::ConditionVariable.new
max = 100000
i = 0
wait = nil
m2.synchronize do
wait = Thread.new do
m1.synchronize do
m2.synchronize { cv2.signal }
while (i += 1) < max
cv1.wait(m1)
cv2.signal
end
end
end
cv2.wait(m2)
end
m1.synchronize do
while i < max
cv1.signal
cv2.wait(m1)
end
end
wait.join
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