Re: sleep

[Fabio Mascarenhas <mascarenhas@...>]

Using http://alien.luaforge.net

-----------------------
require "alien"

if alien.platform == "windows" then
 local sleep = alien.kernel32.Sleep
 sleep:types{ abi = "stdcall", ret = "void", "int" }
 -- Windows' Sleep takes duration in ms
 function _G.sleep(n) sleep(n * 1000) end
else
 local sleep = alien.default.sleep
 sleep:types("void", "int")
 function _G.sleep(n) sleep(n) end
end

-- now sleep for two seconds
sleep(2)
----------------

You could say this is overkill, of course. :-)
--
Fabio Mascarenhas




On Thu, May 21, 2009 at 10:38 AM, Marco Antonio Abreu
<mabreu.ti@gmail.com> wrote:
> Hi. I were using something like this, os.time() instead o os.clock(), but it
> uses much CPU to do nothing. In a case like mine, where the server is so
> hard used by many process, it could be very bad for global performance.
> tks
> [],
> Marco
>
>
> On Wed, May 20, 2009 at 11:58 PM, RJP Computing <rjpcomputing@gmail.com>
> wrote:
>>
>>
>> On Wed, May 20, 2009 at 4:33 PM, Marco Antonio Abreu <mabreu.ti@gmail.com>
>> wrote:
>>>
>>> Hi Guys,
>>> I am writting a script to copy some data from one database to another,
>>> this script will be running all the time, verifying if have something to
>>> copy.
>>> I need to wait for some seconds between two checks, to do not overload
>>> the DB server or CPU.
>>> How can I implement a function (or use if already has) to perform a
>>> "sleep", to wait some (milli)seconds doing nothing.
>>
>> This is a Lua version and yes I know it is not a true Sleep because it
>> uses CPU, but here you go:
>>
>> function Delay( seconds )
>>      local start = os.clock()
>>      while os.clock() - start < seconds do end
>>  end
>>
>> Delay( .500 )
>> --
>> Regards,
>> Ryan
>
>
>
>