DS Desour

Problem:

SSCSM is still not implemented, after years.

Suggestion / plan:

First, implement a SSCSM that has just client-provided (checksumed, to avoid cheating) builtin (SSCSMCPB).

The Problem

LuaJIT does not compile creating closures (see http://wiki.luajit.org/NYI#bytecode). However, sometimes we do want to create closures at runtime and pass them as callback parameters.

Example:

	-- load time
	local function maybe_call_callback(f)


	Goal: Reduce release delay and uncertainty.

	Reasons I saw why releases get delayed:

	* the milestone doesn't get empty
	* there's some regression(s). and a bugfix is not in sight
	* someone wants a 90% complete feature in the next release
	* coredevs inactive. (no active work being done to get progress in the remaining
	issues)


	general remarks:
	* a shape is a bitmap where bit i is 0 iff slot i is ""
	* all recipes get a number at registration, this number is an index into an array.
	higher number was registered later => can be used for priority
	* caching should also be added later


	(1) PRIORITY_SHAPED

	// copied and adapted from the example in man page futex(2) ("futex_demo.c")

	// requires libfmt (because of personal dislike of c++ stream output)
	// compile with:
	// g++ -O2 -Wall -Wextra -std=c++17 -g -o "test_futex" "test_futex.cpp" -lfmt

	// The busy waiting uses x86-64 intrinsics:
	// * rdtsc: IIRC, the timestamp values are processor-specific. (No longer used,
	// benchmark runs faster without it.)
	// * pause: always available on x86-64

	-- by DS, MIT

	-- Note: texture coordinates are currently completely wrong and broken

	-- Please insert your nodebox here:
	local input_nodebox = {
	type = "fixed",
	fixed = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
	}


	local lfs = require("lfs")
	local sqlite3 = require("lsqlite3")

	local cache_path = "path_to_minetest/cache/" -- please edit this!

	local function check(expected, ...)
	if select(1, ...) == expected then
	return ...
	end

	local n = 1000

	minetest.register_chatcommand("swi", {
	params = "",
	description = "",
	privs = {},
	func = function(name, param)
	local player = minetest.get_player_by_name(name)
	local item = player:get_wielded_item()