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concurrent = require 'concurrent'

function pong()

while true do

local msg = concurrent.receive()

if msg.body == 'finished' then

break

elseif msg.body == 'ping' then

print('pong received ping')

concurrent.send(msg.from, { body = 'pong' })

end

end

print('pong finished')

end

concurrent.init('pong@gaia')

pid = concurrent.spawn(pong)

concurrent.register('pong', pid)

concurrent.loop()

concurrent.shutdown()