prosody
c94167139f27
util/timer.lua

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util/timer.lua @ 4385:c94167139f27

util.timer: Fix corner case of timer not repeating if it returns <= 0
author Matthew Wild <mwild1@gmail.com>
date Thu, 22 Sep 2011 15:48:56 +0100
parent 3683:c2158221e2e6
child 4413:ffa4bed1b716
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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10 local ns_addtimer = require "net.server".addtimer;
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11 local event = require "net.server".event;
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12 local event_base = require "net.server".event_base;
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13
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14 local math_min = math.min
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15 local math_huge = math.huge
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16 local get_time = require "socket".gettime;
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17 local t_insert = table.insert;
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18 local t_remove = table.remove;
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19 local ipairs, pairs = ipairs, pairs;
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20 local type = type;
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21
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22 local data = {};
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23 local new_data = {};
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24
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25 module "timer"
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26
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27 local _add_task;
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28 if not event then
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29 function _add_task(delay, func)
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30 local current_time = get_time();
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31 delay = delay + current_time;
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32 if delay >= current_time then
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33 t_insert(new_data, {delay, func});
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34 else
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35 local r = func();
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36 if r and type(r) == "number" then
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37 return _add_task(r, func);
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38 end
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39 end
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40 end
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41
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42 ns_addtimer(function()
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43 local current_time = get_time();
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44 if #new_data > 0 then
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45 for _, d in pairs(new_data) do
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46 t_insert(data, d);
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47 end
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48 new_data = {};
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49 end
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50
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51 local next_time = math_huge;
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52 for i, d in pairs(data) do
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53 local t, func = d[1], d[2];
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54 if t <= current_time then
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55 data[i] = nil;
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56 local r = func(current_time);
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57 if type(r) == "number" then
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58 _add_task(r, func);
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59 next_time = math_min(next_time, r);
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60 end
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61 else
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62 next_time = math_min(next_time, t - current_time);
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63 end
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64 end
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65 return next_time;
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66 end);
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67 else
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68 local EVENT_LEAVE = (event.core and event.core.LEAVE) or -1;
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69 function _add_task(delay, func)
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70 local event_handle;
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71 event_handle = event_base:addevent(nil, 0, function ()
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72 local ret = func();
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73 if ret then
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74 return 0, ret;
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75 elseif event_handle then
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76 return EVENT_LEAVE;
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77 end
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78 end
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79 , delay);
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80 end
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81 end
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82
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83 add_task = _add_task;
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84
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85 return _M;