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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 ~= "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;
};
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