File

util/watchdog.lua @ 5398:4a3737f0ce9a

Merge 0.9->trunk
author Matthew Wild <mwild1@gmail.com>
date Thu, 28 Mar 2013 09:51:03 -0400
parent 4891:189cfe565d03
child 6777:5de6b93d0190
line wrap: on
line source

local timer = require "util.timer";
local setmetatable = setmetatable;
local os_time = os.time;

module "watchdog"

local watchdog_methods = {};
local watchdog_mt = { __index = watchdog_methods };

function new(timeout, callback)
	local watchdog = setmetatable({ timeout = timeout, last_reset = os_time(), callback = callback }, watchdog_mt);
	timer.add_task(timeout+1, function (current_time)
		local last_reset = watchdog.last_reset;
		if not last_reset then
			return;
		end
		local time_left = (last_reset + timeout) - current_time;
		if time_left < 0 then
			return watchdog:callback();
		end
		return time_left + 1;
	end);
	return watchdog;
end

function watchdog_methods:reset()
	self.last_reset = os_time();
end

function watchdog_methods:cancel()
	self.last_reset = nil;
end

return _M;