From d53889185ac93c9744ee2ad35eee863929267903 Mon Sep 17 00:00:00 2001
From: Matthew Wild <mwild1@gmail.com>
Date: Fri, 21 Oct 2011 17:12:45 -0400
Subject: util.watchdog: Watchdog timer library
---
util/watchdog.lua | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
create mode 100644 util/watchdog.lua
diff --git a/util/watchdog.lua b/util/watchdog.lua
new file mode 100644
index 00000000..96031415
--- /dev/null
+++ b/util/watchdog.lua
@@ -0,0 +1,34 @@
+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;
--
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