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util/watchdog.lua

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util/watchdog.lua @ 5194:9dca5bd5c2be

Merge with a merge (or something)
author Matthew Wild <mwild1@gmail.com>
date Thu, 22 Nov 2012 21:02:27 +0000
parent 4891:189cfe565d03
child 6777:5de6b93d0190
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0ed617f58404 util.watchdog: Watchdog timer library
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1 local timer = require "util.timer";
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2 local setmetatable = setmetatable;
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3 local os_time = os.time;
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4
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5 module "watchdog"
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6
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7 local watchdog_methods = {};
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8 local watchdog_mt = { __index = watchdog_methods };
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9
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10 function new(timeout, callback)
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11 local watchdog = setmetatable({ timeout = timeout, last_reset = os_time(), callback = callback }, watchdog_mt);
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12 timer.add_task(timeout+1, function (current_time)
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13 local last_reset = watchdog.last_reset;
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14 if not last_reset then
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15 return;
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16 end
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17 local time_left = (last_reset + timeout) - current_time;
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18 if time_left < 0 then
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189cfe565d03 util.watchdog: Pass watchdog object to callback so that it doesn't always have to be a closure
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19 return watchdog:callback();
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20 end
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21 return time_left + 1;
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22 end);
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23 return watchdog;
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24 end
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25
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26 function watchdog_methods:reset()
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27 self.last_reset = os_time();
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28 end
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29
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30 function watchdog_methods:cancel()
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31 self.last_reset = nil;
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32 end
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33
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34 return _M;