Re: efficient timers
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- Subject: Re: efficient timers
- From: Paul Merrell <marbux@...>
- Date: 2015年4月12日 17:51:33 -0700
On Sun, Apr 12, 2015 at 12:49 PM, Nagaev Boris <bnagaev@gmail.com> wrote:
> I have seen the following timers in Lua:
>
> * posix.unistd.sleep [1]
> * posix.time.nanosleep [2]
> * posix.curses.napms [3]
> * ngx.sleep [4]
>
> [1] https://luaposix.github.io/luaposix/modules/posix.unistd.html#sleep
> [2] https://luaposix.github.io/luaposix/modules/posix.time.html#nanosleep
> [3] https://luaposix.github.io/luaposix/modules/posix.curses.html#napms
> [4] http://wiki.nginx.org/HttpLuaModule#ngx.sleep
More that I've snipped from here and there:
Clean sleep method using a repeat … until loop, by Peter Odding,
<http://lua-users.org/lists/lua-l/2008-03/msg00213.html>
Large page of methods at <http://lua-users.org/wiki/SleepFunction>.
Suspend/resume a Lua script using coroutines:
<http://stackoverflow.com/questions/6145059/how-to-suspend-resume-processing-of-a-lua-command>
--- Delay for a number of seconds.
-- @param delay Number of seconds
function delay_s(delay)
delay = delay or 1
local time_to = os.time() + delay
while os.time() < time_to do end
end
-- wait for a reply, using a custom timeout (set to 5 seconds here):
-- send HTTP request
strQuery = "GET " .. strVersionUrlUri .. " HTTP/1.1\r\nHost: " ..
strVersionUrlHost .. "\r\n\r\n"
net.write(nSocket, strQuery)
t1 = os.time()
-- read HTTP response
strReply = ""
bFirstRead = true
nTimeoutSec = 5
repeat
if bFirstRead == true then
repeat nSize, strChunk = net.read(nSocket)
until strChunk ~= "" or os.difftime(os.time(), t1) > nTimeoutSec
else
nSize, strChunk = net.read(nSocket)
end
strReply = strReply .. strChunk
bFirstRead = false
until nSize <= 0
Best regards,
Paul
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