用Lua的协程实现类似Unity协程的语句块 

 1 local co_time_tbl = {}
 2 setmetatable(co_time_tbl, { __len = function(o)
 3     local count = 0
 4     for k, v in pairs(o) do
 5         count = count + 1
 6     end
 7     return count
 8 end
 9 })
10 
11 local function isWindows()
12     return package.config:sub(1, 1) == "\\"
13 end
14 
15 local function sleep(n)
16     if isWindows() then
17         if n > 0 then
18             os.execute("ping -n " .. tonumber(n + 1) .. " localhost > NUL")
19         end
20     else
21         os.execute("sleep " .. tonumber(n))
22     end
23 end
24 
25 local function Update(deltaTime)
26     -- main loop
27 end
28 
29 local function updateCoroutine()
30     local iTime = os.time()
31     for kco, vTime in pairs(co_time_tbl) do
32         if iTime >= vTime then
33             if coroutine.status(kco) == "suspended" or coroutine.status(kco) == "normal" then
34                 coroutine.resume(kco)
35             elseif coroutine.status(kco) == "dead" then
36                 co_time_tbl[kco] = nil
37             end
38         end
39     end
40 end
41 
42 function coroutine.waitforSeconds(second)
43     assert(type(second) == "number" or second <= 0)
44     local iEndTime = os.time() + second
45     local co = coroutine.running()
46     if co then
47         co_time_tbl[co] = iEndTime
48         return coroutine.yield()
49     end
50 end
51 
52 local function main()
53     local co1 = coroutine.wrap(function()
54         coroutine.waitforSeconds(5)
55         print("after 5 seconds")
56     end)
57     local co2 = coroutine.wrap(function()
58         coroutine.waitforSeconds(4)
59         print("after 4 seconds")
60     end)
61     local co3 = coroutine.wrap(function()
62         coroutine.waitforSeconds(3)
63         print("after 3 seconds")
64     end)
65     local count = 0
66     local co4 = coroutine.wrap(function()
67         while (true) do
68             coroutine.waitforSeconds(1)
69             count = count + 1
70             print("coroutine num: " .. #co_time_tbl .. " | second count:" .. count)
71         end
72     end)
73     co1()
74     co2()
75     co3()
76     co4()
77     while true do
78         sleep(0.033)
79         Update()
80         updateCoroutine()
81     end
82 end
83 
84 main()
View Code

 

思路其实就是用一张表维护协程要等待的时间，在主循环之后更新计时器，根据时间将挂起的协程唤醒就行

posted @ 2019-11-05 18:39  0kk470  阅读(411)  评论(0)  编辑  收藏  举报