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;
23 local _active_timers = 0;
24 local h = indexedbheap.create();
26 local next_time = nil;
27 local _id, _callback, _now, _param;
28 local function _call() return _callback(_now, _id, _param); end
29 local function _traceback_handler(err) log("error", "Traceback[timer]: %s", debug_traceback(tostring(err), 2)); end
30 local function _on_timer(now)
34 if peek == nil or peek > now then break; end
36 _, _callback, _id = h:pop();
40 --item(now, id, _param); -- FIXME pcall
41 local success, err = xpcall(_call, _traceback_handler);
42 if success and type(err) == "number" then
43 h:insert(_callback, err + now, _id); -- re-add
48 if peek ~= nil and _active_timers > 1 and peek == next_time then
49 -- Another instance of _on_timer already set next_time to the same value,
50 -- so it should be safe to not renew this timer event
57 -- peek is the time of the next event
60 _active_timers = _active_timers - 1;
62 local function add_task(delay, callback, param)
63 local current_time = get_time();
64 local event_time = current_time + delay;
66 local id = h:insert(callback, event_time);
68 if next_time == nil or event_time < next_time then
69 next_time = event_time;
71 _server_timer:close();
74 _active_timers = _active_timers + 1;
76 _server_timer = _add_task(next_time - current_time, _on_timer);
80 local function stop(id)
82 local result, item, result_sync = h:remove(id);
83 local peek = h:peek();
84 if peek ~= next_time and _server_timer then
86 _server_timer:close();
87 if next_time ~= nil then
88 _server_timer = _add_task(next_time - get_time(), _on_timer);
91 return result, item, result_sync;
93 local function reschedule(id, delay)
94 local current_time = get_time();
95 local event_time = current_time + delay;
96 h:reprioritize(id, delay);
97 if next_time == nil or event_time < next_time then
98 next_time = event_time;
99 _add_task(next_time - current_time, _on_timer);
107 reschedule = reschedule;