lua 协程(coroutine)

local function f(a)
  local thread = coroutine.running()
  ngx.say("status:",coroutine.status(thread))
  ngx.say("1")
  coroutine.yield()
  ngx.say("2")
  coroutine.yield()
end

local function ff(a)
  ngx.say("ff:",a)
end

local curr = coroutine.create(f)
ngx.say("return type(create()):",type(curr))

ngx.say("status:",coroutine.status(curr))
ngx.say("resume 1")
coroutine.resume(curr)
ngx.say("status:",coroutine.status(curr))

ngx.say("resume 2")
coroutine.resume(curr)

--和create类似,返回函数用起来方便一些,但不返回错误码,无法检测运行时错误
local wrap_fun = coroutine.wrap(ff)
ngx.say("return type(wrap()):",type(wrap_fun))
wrap_fun(3)


return type(create()):thread
status:suspended
resume 1
status:running
1
status:suspended
resume 2
2
return type(wrap()):function
ff:3

co = coroutine.create(function ()
  print("hello")
end)
print(co)
print(coroutine.status(co))
coroutine.resume(co)
print(coroutine.status(co))

function test_loop()
  for i=1,3 do
    print(coroutine.status(co))
    print(i)
    coroutine.yield()
  end
end

co = coroutine.create(test_loop)
coroutine.resume(co)
coroutine.resume(co) 

thread: 0x67a5ef60
suspended
hello
dead
running
1
running
2