LUA延时控制

与C++交互实现

通过C++提供Sleep函数给LUA调用即可，可以任意实现。比如超过5秒再提示相应倒计时功能。

if(funName == L"Sleep") {
	if(lua->CheckParamCount(params, 1)) {
		int sleepMs = lua->ParseInt(THelper::GetLuaParamAt(params, 0));
		DWORD startMoment = GetTickCount();
		int second = 0, total = sleepMs / 1000, lastSecond = 0;
		while(GetTickCount() < startMoment + sleepMs) {
			second = (GetTickCount() - startMoment) / 1000;
			if(sleepMs > 5000 && (second != lastSecond)) {
				lua->LogInfo(THelper::FormatString(L"倒计时： %d 秒", total - second));
				lastSecond = second;
			}
			THelper::Util::Delay(100);
		}
	}
}

如果还希望达到毫秒级控制，用C++也表示毫无压力

其它可参考方式

网上资源比较多。如

Lua封装延时执行函数

https://blog.youkuaiyun.com/zhenyu5211314/article/details/50437901
延时执行函数

function delayTimeGuideEvent( target, func, times )
    -- 延迟时间执行函数
    local delaytime = 1
    if times then delaytime = times end
    getRoot(target):runAction(CCSequence:createWithTwoActions(CCDelayTime:create(delaytime), CCCallFunc:create(func)))
end

LUA的延时调用功能

https://blog.youkuaiyun.com/yejian2011/article/details/41173031

-- 延时 0.2 关闭 

    local schedulerEntry = nil

    local    scheduler = cc.Director:getInstance():getScheduler()

    local function removeLayer(time)

        scheduler:unscheduleScriptEntry(schedulerEntry)

        schedulerEntry = nil

        layer:removeFromParentAndCleanup(true)   

    end

    schedulerEntry = scheduler:scheduleScriptFunc(removeLayer, 0.2, false)

Sleep Function

http://lua-users.org/wiki/SleepFunction

A common need is to pause (sleep) a program for a certain number of seconds, preferably without busy waiting.
This function to do this without busy waiting does not exist in ANSI C, so it does not exist in stock Lua. However, there are extension libraries and calls to external programs that can do this.

Solution: Busy Wait
local clock = os.clock
function sleep(n) – seconds
local t0 = clock()
while clock() - t0 <= n do end
end
– warning: clock can eventually wrap around for sufficiently large n
– (whose value is platform dependent). Even for n == 1, clock() - t0
– might become negative on the second that clock wraps.
Solution: C extension
There is a sleep function in ExtensionProposal. This may call Win32 Sleep or POSIX usleep. Here’s a [usleep/sleep C wrapper] example.
The LuaApr binding has an [apr.sleep()] function that works on Windows & UNIX and supports sub-second resolution.
The lalarm library[1] can set an alarm on POSIX.
winapi (Windows only) has a [sleep] function. [github]
If an FFI interface (Alien or c/invoke – BindingCodeToLua) is available, you can call whichever OS function you have.
Solution: sleep command
function sleep(n)
os.execute("sleep " … tonumber(n))
end
Windows does not have such a built-in command. However, there’s a sleep in the Windows Server Resource Kit. There is also sleep in Cygwin and MinGW. Also, there is “timeout” utility available in Windows 7
os.execute("timeout " … tonumber(n)) – specific to win7 (and probably higher)
Solution: ping or other programs
function sleep(n)
if n > 0 then os.execute(“ping -n " … tonumber(n+1) … " localhost > NUL”) end
end
– version 20100715 - fixed off-by-one second
This is mainly for Windows in the absence of a sleep command. Other variations exist, e.g. “perl -e 'sleep(” … tonumber(n) … “)’” or “php -r sleep(” … tonumber(n) … “);”.
Solution: I/O wait
io.stdin:read’*l’
This is not a sleep but may be useful in similar cases. It waits for the user to press the Enter key.
Solution: Using WScript (Windows)
function sleep(n)
local vb = “test.vbs”
local f = assert(io.open(vb,“w”))
f:write(“WScript.Sleep(” … (tonumber(n) * 1000) … “)\n”)
f:close()
os.execute(vb)
end
See [2].
Solution: sleep()
The POSIX sleep() call provides integer second sleeps.
require “posix”
posix.sleep(3)
Solution: socket.sleep()
The LuaSocket? module provides a sleep function.
socket = require(“socket”)
function sleep(sec)
socket.sleep(sec)
end
sleep(0.2)
Solution: ngx.sleep()
Nginx Lua module provides a sleep function. One can specify time resolution up to 0.001 seconds (i.e., one milliseconds). Behind the scene, this method makes use of the Nginx timers.
ngx.sleep(sec)
Solution: lsocket.select()
The select() timeout provides a fairly portable sub-second sleep, if you can tolerate the socket library dependency.
local lsocket = require(“lsocket”)
function sleep(sec)
lsocket.select(sec)
end
sleep(2)
Solution: LuaJIT FFI/LuaFFI
local ffi = require “ffi”
ffi.cdef “unsigned int sleep(unsigned int seconds);”
ffi.C.sleep(2)
Solution: os.time()
function sleep(s)
local ntime = os.time() + s
repeat until os.time() > ntime
end
Solution: os.clock()
. .
Using the os.clock() method instead of os.time(), you can get precision down to one 100th of a second while os.time() only allows intervals based on the timestamp, which at execution can be at anything from 0.1 to 1 second. The os.time() method is great for longer periods over 2 seconds where precision isn’t that much of a deal.
…
function sleep(s)
local ntime = os.clock() + s/10
repeat until os.clock() > ntime
end

没细品，后续再研究