Carlo Alberto Ferraris CAFxX

CAFxX / bigquery_prevent_concurrent_runs.sql

Last active April 23, 2022 07:30

Ensure at most a single BigQuery scheduled query is running at one time

	DECLARE check_running_jobs DEFAULT (
	SELECT IF(COUNT(*) > 1, ERROR('query already running'), NULL)
	FROM `region-name`.INFORMATION_SCHEMA.JOBS_BY_PROJECT
	WHERE state <> 'DONE'
	);

CAFxX / custom_key_map.go

Created April 22, 2022 09:40

Golang map with custom-compare/hash keys

	package main

	import (
	"encoding/binary"
	"fmt"
	"hash/maphash"
	"math/rand"
	)

	type Comparable[T any] interface {

CAFxX / example_test.go

Created April 22, 2022 08:24

reflect.SliceHeader and reflect.StringHeader examples

	package reflect_test

	// Extracted from https://go-review.googlesource.com/c/go/+/401434

	import (
	"fmt"
	"reflect"
	"unsafe"
	)

CAFxX / shortstring.go

Created April 14, 2022 10:09

CAFxX / LUT.c

Created January 18, 2022 01:17


	#include <immintrin.h>

	static int lut32x(int32_t *inout, __m512i lutk[], __m512i lutv[], int nlut) {
	__m512i bin = _mm512_set1_epi32(*inout);
	for (int i=0; i<nlut; i++) {
	__mmask16 mask = _mm512_cmpeq_epi32_mask(bin, lutk[i]);
	if (mask == 0) continue;
	__m512i bout = _mm512_maskz_compress_epi32(mask, lutv[i]);
	*inout = _mm_extract_epi32(_mm512_extracti32x4_epi32(bout, 0), 0);

CAFxX / bijective_map.go

Created November 22, 2021 06:34

	package container

	type BijectiveMap[A, B comparable] struct {
	m1 map[A]B
	m2 map[B]A
	}

	func (m *BijectiveMap[A, B]) GetB(a A) (B, bool) {
	if m.m1 == nil {
	var zero B

CAFxX / gedi-adblock-modal-remover.js

Last active August 30, 2021 22:49

CAFxX / workqueue.go

Created August 25, 2021 00:19

CAFxX / fls.c

Last active August 17, 2021 09:30

	// fast file list (linux)
	// adapted from https://man7.org/linux/man-pages/man2/getdents.2.html
	// gcc -O3 -march=native -o fls fls.c
	#define _GNU_SOURCE
	#include <dirent.h> /* Defines DT_* constants */
	#include <fcntl.h>
	#include <stdint.h>
	#include <stdio.h>
	#include <unistd.h>
	#include <stdlib.h>

CAFxX / weak.go

Last active December 24, 2022 13:22

Weak references for Go

	// Weak references for Go
	// Copyright (C) 2021 Carlo Alberto Ferraris
	//
	// Based on:
	// https://lab.nexedi.com/kirr/neo/blob/bb618ce122423c5ff5fa997c5aafd06819cafe40/go/zodb/internal/weak/weak.go
	//
	// Original copyright notice:
	//
	// Copyright (C) 2018 Nexedi SA and Contributors.
	// Kirill Smelkov <kirr@nexedi.com>

	// ==UserScript==
	// @name La Stampa/Repubblica Adblock Modal Remover
	// @name:it La Stampa/Repubblica Elimina Messaggio Adblock
	// @namespace http://tampermonkey.net/
	// @version 0.1
	// @description Remove the adblock modal on lastampa.it and repubblica.it
	// @description:it Elimina il messaggio modale che impedisce l'uso dei siti di La Stampa (lastampa.it) e Repubblica (repubblica.it) in caso di presenza di adblocker
	// @author CAFxX
	// @match https://.lastampa.it/
	// @match https://.repubblica.it/