File

util/gc.lua @ 12480:7e9ebdc75ce4

net: isolate LuaSec-specifics For this, various accessor functions are now provided directly on the sockets, which reach down into the LuaSec implementation to obtain the information. While this may seem of little gain at first, it hides the implementation detail of the LuaSec+LuaSocket combination that the actual socket and the TLS layer are separate objects. The net gain here is that an alternative implementation does not have to emulate that specific implementation detail and "only" has to expose LuaSec-compatible data structures on the new functions.
author Jonas Schäfer <jonas@wielicki.name>
date Wed, 27 Apr 2022 17:44:14 +0200
parent 11431:4874b54af344
child 12975:d10957394a3c
line wrap: on
line source

local set = require "util.set";

local known_options = {
	incremental = set.new { "mode", "threshold", "speed", "step_size" };
	generational = set.new { "mode", "minor_threshold", "major_threshold" };
};

if _VERSION ~= "Lua 5.4" then
	known_options.generational = nil;
	known_options.incremental:remove("step_size");
end

local function configure(user, defaults)
	local mode = user.mode or defaults.mode or "incremental";
	if not known_options[mode] then
		return nil, "GC mode not supported on ".._VERSION..": "..mode;
	end

	for k, v in pairs(user) do
		if not known_options[mode]:contains(k) then
			return nil, "Unknown GC parameter: "..k;
		elseif k ~= "mode" and type(v) ~= "number" then
			return nil, "parameter '"..k.."' should be a number";
		end
	end

	if mode == "incremental" then
		if _VERSION == "Lua 5.4" then
			collectgarbage(mode,
				user.threshold or defaults.threshold,
				user.speed or defaults.speed,
				user.step_size or defaults.step_size
			);
		else
			collectgarbage("setpause", user.threshold or defaults.threshold);
			collectgarbage("setstepmul", user.speed or defaults.speed);
		end
	elseif mode == "generational" then
		collectgarbage(mode,
			user.minor_threshold or defaults.minor_threshold,
			user.major_threshold or defaults.major_threshold
		);
	end
	return true;
end

return {
	configure = configure;
};