Software /
code /
prosody
File
util/envload.lua @ 10571:cfeb0077c9e9
net.server_epoll: Avoid concatenating buffer with single item
Saves creating a string that'll be identical to buffer[1] anyways, as
well as a C function call. Depending on Lua version and length of the
string, this could be reusing an interned string, but a longer one would
probably be duplicated for no reason.
Having exactly one item in the buffer seems like it would be fairly
common, but I have not done an extensive study. If opportunistic writes
are enabled then it will be even more likely.
This special case could be optimized like this in table.concat but it
does not look like it is.
author | Kim Alvefur <zash@zash.se> |
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date | Sat, 28 Dec 2019 06:18:58 +0100 |
parent | 8416:bc9cb23b604a |
child | 12576:d1aacc6a81ac |
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-- Prosody IM -- Copyright (C) 2008-2011 Florian Zeitz -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- -- luacheck: ignore 113/setfenv 113/loadstring local load, loadstring, setfenv = load, loadstring, setfenv; local io_open = io.open; local envload; local envloadfile; if setfenv then function envload(code, source, env) local f, err = loadstring(code, source); if f and env then setfenv(f, env); end return f, err; end function envloadfile(file, env) local fh, err, errno = io_open(file); if not fh then return fh, err, errno; end local f, err = load(function () return fh:read(2048); end, "@"..file); fh:close(); if f and env then setfenv(f, env); end return f, err; end else function envload(code, source, env) return load(code, source, nil, env); end function envloadfile(file, env) local fh, err, errno = io_open(file); if not fh then return fh, err, errno; end local f, err = load(fh:lines(2048), "@"..file, nil, env); fh:close(); return f, err; end end return { envload = envload, envloadfile = envloadfile };