prosody
59557bc3c4b8
util/queue.lua

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util/queue.lua @ 12084:59557bc3c4b8 0.11

net.server_epoll: Process all queued events from epoll before timers Should call timers less frequently when many sockets are waiting for processing. May help under heavy load. Requested by Ge0rG Backport of 2bcd84123eba requested by Roi
author Kim Alvefur <zash@zash.se>
date Thu, 21 Oct 2021 15:59:16 +0200
parent 11103:73b8aaf55775
child 11114:6a608ecb3471
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343ca80ceb36 util.queue: Small fast FIFO/ringbuffer/queue library
Matthew Wild <mwild1@gmail.com>
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2015 Matthew Wild
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3 -- Copyright (C) 2008-2015 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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9 -- Small ringbuffer library (i.e. an efficient FIFO queue with a size limit)
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10 -- (because unbounded dynamically-growing queues are a bad thing...)
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11
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12 local have_utable, utable = pcall(require, "util.table"); -- For pre-allocation of table
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13
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14 local function new(size, allow_wrapping)
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15 -- Head is next insert, tail is next read
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16 local head, tail = 1, 1;
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17 local items = 0; -- Number of stored items
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18 local t = have_utable and utable.create(size, 0) or {}; -- Table to hold items
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19 --luacheck: ignore 212/self
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20 return {
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21 _items = t;
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22 size = size;
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23 count = function (self) return items; end;
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24 push = function (self, item)
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25 if items >= size then
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26 if allow_wrapping then
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27 tail = (tail%size)+1; -- Advance to next oldest item
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28 items = items - 1;
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29 else
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30 return nil, "queue full";
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31 end
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32 end
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33 t[head] = item;
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34 items = items + 1;
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35 head = (head%size)+1;
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36 return true;
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37 end;
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38 pop = function (self)
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39 if items == 0 then
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40 return nil;
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41 end
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42 local item;
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43 item, t[tail] = t[tail], 0;
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44 tail = (tail%size)+1;
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45 items = items - 1;
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46 return item;
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47 end;
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48 peek = function (self)
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49 if items == 0 then
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50 return nil;
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51 end
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52 return t[tail];
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53 end;
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54 replace = function (self, data)
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55 if items == 0 then
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56 return self:push(data);
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57 end
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58 t[tail] = data;
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59 return true;
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60 end;
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61 items = function (self)
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62 --luacheck: ignore 431/t
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63 return function (t, pos)
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64 if pos >= t:count() then
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65 return nil;
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66 end
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67 local read_pos = tail + pos;
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68 if read_pos > t.size then
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69 read_pos = (read_pos%size);
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70 end
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71 return pos+1, t._items[read_pos];
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72 end, self, 0;
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73 end;
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74 };
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75 end
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76
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77 return {
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78 new = new;
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79 };
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80