1 files changed, 83 insertions, 0 deletions
diff --git a/util/timer.lua b/util/timer.lua
new file mode 100644
index 00000000..af1e57b6
--- /dev/null
+++ b/util/timer.lua
@@ -0,0 +1,83 @@
+-- Prosody IM
+-- Copyright (C) 2008-2010 Matthew Wild
+-- Copyright (C) 2008-2010 Waqas Hussain
+-- 
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
+
+local server = require "net.server";
+local math_min = math.min
+local math_huge = math.huge
+local get_time = require "socket".gettime;
+local t_insert = table.insert;
+local pairs = pairs;
+local type = type;
+
+local data = {};
+local new_data = {};
+
+module "timer"
+
+local _add_task;
+if not server.event then
+	function _add_task(delay, callback)
+		local current_time = get_time();
+		delay = delay + current_time;
+		if delay >= current_time then
+			t_insert(new_data, {delay, callback});
+		else
+			local r = callback(current_time);
+			if r and type(r) == "number" then
+				return _add_task(r, callback);
+			end
+		end
+	end
+
+	server._addtimer(function()
+		local current_time = get_time();
+		if #new_data > 0 then
+			for _, d in pairs(new_data) do
+				t_insert(data, d);
+			end
+			new_data = {};
+		end
+		
+		local next_time = math_huge;
+		for i, d in pairs(data) do
+			local t, callback = d[1], d[2];
+			if t <= current_time then
+				data[i] = nil;
+				local r = callback(current_time);
+				if type(r) == "number" then
+					_add_task(r, callback);
+					next_time = math_min(next_time, r);
+				end
+			else
+				next_time = math_min(next_time, t - current_time);
+			end
+		end
+		return next_time;
+	end);
+else
+	local event = server.event;
+	local event_base = server.event_base;
+	local EVENT_LEAVE = (event.core and event.core.LEAVE) or -1;
+
+	function _add_task(delay, callback)
+		local event_handle;
+		event_handle = event_base:addevent(nil, 0, function ()
+			local ret = callback(get_time());
+			if ret then
+				return 0, ret;
+			elseif event_handle then
+				return EVENT_LEAVE;
+			end
+		end
+		, delay);
+	end
+end
+
+add_task = _add_task;
+
+return _M;