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annotate util/gc.lua @ 11071:f69a63b80f3a 0.11

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util.gc: New module for configuring the Lua garbage collector
author Matthew Wild <mwild1@gmail.com>
date Mon, 15 Jun 2020 14:16:10 +0100
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children 2d57c49bfa12
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11071
f69a63b80f3a util.gc: New module for configuring the Lua garbage collector
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1 local array = require "util.array";
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2 local set = require "util.set";
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3
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4 local known_options = {
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5 incremental = set.new { "mode", "threshold", "speed", "step_size" };
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6 generational = set.new { "mode", "minor_threshold", "major_threshold" };
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7 };
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8
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9 if _VERSION ~= "5.4" then
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10 known_options.generational = nil;
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11 known_options.incremental:remove("step_size");
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12 end
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13
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14 local function configure(user, defaults)
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15 local mode = user.mode or defaults.mode or "incremental";
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16 if not known_options[mode] then
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17 return nil, "GC mode not supported on ".._VERSION..": "..mode;
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18 end
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19
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20 for k, v in pairs(user) do
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21 if not known_options[mode]:contains(k) then
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22 return nil, "Unknown GC parameter: "..k;
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23 elseif k ~= "mode" and type(v) ~= "number" then
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24 return nil, "parameter '"..k.."' should be a number";
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25 end
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26 end
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27
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28 if mode == "incremental" then
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29 if _VERSION == "Lua 5.4" then
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30 collectgarbage(mode,
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31 user.threshold or defaults.threshold,
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32 user.speed or defaults.speed,
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33 user.step_size or defaults.step_size
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34 );
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35 else
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36 collectgarbage("setpause", user.threshold or defaults.threshold);
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37 collectgarbage("setstepmul", user.speed or defaults.speed);
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38 end
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39 elseif mode == "generational" then
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40 collectgarbage(mode,
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41 user.minor_threshold or defaults.minor_threshold,
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42 user.major_threshold or defaults.major_threshold
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43 );
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44 end
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45 return true;
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46 end
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47
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48 return {
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49 configure = configure;
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50 };