2 -- Copyright (C) 2008-2010 Matthew Wild
3 -- Copyright (C) 2008-2010 Waqas Hussain
5 -- This project is MIT/X11 licensed. Please see the
6 -- COPYING file in the source package for more information.
9 local indexedbheap = require "util.indexedbheap";
10 local log = require "util.logger".init("timer");
11 local server = require "net.server";
12 local get_time = require "socket".gettime;
14 local debug_traceback = debug.traceback;
15 local tostring = tostring;
16 local xpcall = xpcall;
20 local _add_task = server.add_task;
22 local _active_timers = 0;
23 local h = indexedbheap.create();
25 local next_time = nil;
26 local _id, _callback, _now, _param;
27 local function _call() return _callback(_now, _id, _param); end
28 local function _traceback_handler(err) log("error", "Traceback[timer]: %s", debug_traceback(tostring(err), 2)); end
29 local function _on_timer(now)
33 if peek == nil or peek > now then break; end
35 _, _callback, _id = h:pop();
39 --item(now, id, _param); -- FIXME pcall
40 local success, err = xpcall(_call, _traceback_handler);
41 if success and type(err) == "number" then
42 h:insert(_callback, err + now, _id); -- re-add
47 if peek ~= nil and _active_timers > 1 and peek == next_time then
48 -- Another instance of _on_timer already set next_time to the same value,
49 -- so it should be safe to not renew this timer event
56 -- peek is the time of the next event
59 _active_timers = _active_timers - 1;
61 local function add_task(delay, callback, param)
62 local current_time = get_time();
63 local event_time = current_time + delay;
65 local id = h:insert(callback, event_time);
67 if next_time == nil or event_time < next_time then
68 next_time = event_time;
69 _active_timers = _active_timers + 1;
70 _add_task(next_time - current_time, _on_timer);
74 local function stop(id)
78 local function reschedule(id, delay)
79 local current_time = get_time();
80 local event_time = current_time + delay;
81 h:reprioritize(id, delay);
82 if next_time == nil or event_time < next_time then
83 next_time = event_time;
84 _add_task(next_time - current_time, _on_timer);
92 reschedule = reschedule;