[LUA] Chap 9. Coroutine

[예제]


--suspended, running, dead, normal
--coroutine is similar to thread in multi-thread
co = coroutine.create(function() print("hi") end)
print(co)
print(coroutine.status(co))
coroutine.resume(co)
print(coroutine.status(co))
co = coroutine.create(function()
        print(coroutine.status(co))
        for i = 1, 10 do
          print("co", i)
          coroutine.yield()
        end
      end)

coroutine.resume(co)
print(coroutine.status(co))
coroutine.resume(co)
coroutine.resume(co)
coroutine.resume(co)
coroutine.resume(co)
coroutine.resume(co)
coroutine.resume(co)
coroutine.resume(co)
coroutine.resume(co)
coroutine.resume(co)
print(coroutine.resume(co))
print(coroutine.resume(co)) --이 줄 부터 아무것도 출력하지 않음
--resume과 yield를 이용한 데이터 전달
co = coroutine.create(function(a, b, c)
        print("co", a, b, c +2)
      end)
coroutine.resume(co, 1, 2, 3)
co = coroutine.create(function(a,b)
      coroutine.yield(a + b, a - b)
     end)
print(coroutine.resume(co, 20, 10))
co = coroutine.create(function(x)
      print("co1", x)
      print("co2", coroutine.yield())
     end)
    
coroutine.resume(co, "hi")
coroutine.resume(co, 4, 5)
co = coroutine.create(function()
      return 6, 7
     end)
print(coroutine.resume(co))
--[[
function producer()
  while true do
    local x = io.read()
    send(x)
  end
end
--]]
function consumer()
  while true do
    local x = receive()
    io.write(x, "\n")
  end
end
function receive()
  local status, value = coroutine.resume(producer)
  return value
end
function send(x)
  coroutine.yield(x)
end
producer = coroutine.create(
            function()
              while true do
                local x = io.read()
                send(x)
              end
            end)

--Using filter Producer-Consumder
           








[결과]
thread: 0000000000605310
suspended
hi
dead
running
co 1
suspended
co 2
co 3
co 4
co 5
co 6
co 7
co 8
co 9
co 10
true
false cannot resume dead coroutine
co 1 2 5
true 30 10
co1 hi
co2 4 5
true 6 7