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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

function ping(n)

for i = 1, n do

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

local msg = concurrent.receive()

if msg.body == 'pong' then print('ping received pong') end

end

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

print('ping finished')

end

pid = concurrent.spawn(pong)

concurrent.register('pong', pid)

concurrent.spawn(ping, 3)

concurrent.loop()