xLuaTimer

timer = require("timer")
  local co1 = timer:start(
    this:downloadImag() --CS function
  );
  local iswait = true;
  local co2 = timer:start(
    function(param)
      timer:start(
	function()
	  timer:yield(3);
	  iswait=false;
	end
      );
      print(param.testparam);
      timer:yield(); --wait for a frame
      timer:yield(1); --wait for a second
      timer:yield(timer:start(
	function()
	  timer:yield(function() return iswait==false; end) --wait until
	  print("wait XXX");
	end
      ));
    end,
    {testparam="OKOK"}
  );
  --timer:stop(co1);
  --timer:stop(co2);

LuaTimer

This lua script provides some yields which frame,condition,second,coroutine,signal. I tested on unity3d with xlua

--This script is for coroutine with yield second,yield coroutine,yield sign.
--	first, define timer object
	local timer = require 'xlua.Timer-master.timer'
--and you should call a function 'timer.update' every time on all frame with given two parameters: realTime,scaleTime

Need calling everyframe

		function update(rt,st)
			timer.update(rt,st) --realTime, scaleTime
		end

How to use:

	timer.waitFrame()
	timer.waitSecond(3)
	timer:off().waitOR(timer.waitSecond(6),timer.waitSignal("test")):on();
	timer:off().waitAND(timer.waitSecond(6),timer.waitSignal("test")):on();
	timer.waitCoroutine(function(pp)   
		timer:startDebug('Thread3')
		timer.waitSecond(3)													
		timer.signal('a')
		signal 'a'	
		end,10)																	

Case 1

timer.run(coroutine.create(function() 
	timer:startDebug('Thread Frame')
	while(true) do
		timer.waitSecond(1)
		timer.waitFrame()
	end
end))

Case 2

timer.run(function(pp)		      --unblocking		you can use parameter of function 'timer.run' with two type: function, thread
	timer:startDebug('Thread1')
	timer.run(coroutine.create(function()  --unblocking								
		timer:startDebug('Thread2')
		timer.waitSignal('c')       --waiting for signal 'c'								
		timer.waitSecond(10)														
		print("wonderful!!!")														
	end))
	timer.waitSecond(3)	          --waiting for 3 seconds										
	timer.waitSignal('b')         --waiting for signal 'b'									
	timer.waitCoroutine(function(pp)   --waiting for new coroutine until finish		
		timer:startDebug('Thread3')
		timer.waitSecond(3)															
		timer.signal('a')           --send signal 'a' and wake up things waiting signal 'a'	
	end,10)																			
	print("it's very nice!")														
end,432)
timer.run(coroutine.create(function(pp) 	--unblocking    you can use parameter of function 'timer.run' with two type: function, thread				
	timer:startDebug('Thread4')
	timer.waitSecond(5)           --waiting for 5 seconds										
	timer.signal('b')             --send signal 'b' and wake up things waiting signal 'b'		
	timer.waitSignal('a')         --waiting for signal 'a'									
	timer.signal('c')             --send signal 'c' and wake up things waiting signal 'c'		
	print("Awesome!!!")																
end),123)

Case 3

timer.run(function()
	timer:off().waitOR(
		timer.waitSignal("CreatedRoomSuccess"),
		timer.waitSecond(2)
	):on();						
	if timer:checkid('CreatedRoomSuccess')==false then 
	--timer.waitSecond(2)
	else
	--timer.waitSignal("CreatedRoomSuccess"),
	end
end)