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Programming Leftovers

Submitted by Roy Schestowitz on Tuesday 2nd of November 2021 09:05:32 PM Filed under
Development
  • GtkSourceView is getting a VIM emulator – Zen and the Art of GNOME

    One of the things we spent some time on early with Builder was creating built-in VIM emulation. Originally it was written in C, but then got converted to this nasty CSS for a couple of reasons. First, that keybindings in GTK 3 were largely done with CSS due to how we moved away from gtkrc in the 2.x to 3.x migration. And beyond that, CSS was the one way that’d let us share a lot of keybinding code between shortcut themes so we could support emacs, vim, sublime, etc.

    One thing that didn’t work well was VIM’s “modes”. People often think of VIM as a single state (normal, insert, replace, visual, etc). In reality it’s a stack of them. Just look at the following state diagram if you’re going to actually to match things somewhat accurately. Doing this in a manner that would allow sharing between shortcut themes in Builder was simply beyond the amount of time we had to spend on it given all the other features that needed to land.

  • Stupid RCU Tricks: Waiting for Grace Periods From NMI Handlers - Paul E. McKenney's Journal — LiveJournal

    Suppose that you had a state machine implemented by NMI handlers, and that some of the transitions in this state machine need to wait for an RCU grace period to elapse. How could these state transitions be implemented?

    Before we start, let's dispense with a couple of silly options. First, we clearly are not going to invoke synchronize_rcu() from within an NMI handler. This function can sleep, and we cannot sleep even within non-threaded interrupt handlers, let alone within NMI handlers. Second, we are not going to invoke call_rcu() from within an NMI handler. This function disables interrupts to exclude concurrent invocations on a single CPU, and disabling interrupts does nothing to keep NMI handlers from running. Worse yet, when running on rcu_nocbs CPUs (which offload callback invocations to rcuo kthreads), call_rcu() acquires a lock. Therefore, invoking call_rcu() from within an NMI handler would at best result in deadlock, and might also result in corruption of RCU's lists of callbacks.

  • "Ampere-1" GCC Patch Posted For Ampere's Upcoming AArch64 Core Design - Phoronix

    While Ampere Altra and Altra Max processors are achieving great success using Arm Neoverse N1 based cores, as shared earlier this year Ampere has begun designing their own custom Arm server CPU cores for slated introduction in 2022. The first GCC compiler patch for that next-gen Ampere CPU was quietly posted on Monday.

    An initial patch made it out providing support and basic tuning for Ampere's "Ampere-1" CPU. Ampere-1 isn't certainly the marketing name for their initial CPU core design but just what they are referring to at least initially for the GNU Compiler Collection target. Just as before IBM referred to their POWER10 GCC target as the 'future' target and then later on added in proper user-friendly string.

  • An Emulator For OBP, The Spaceflight Computer From The 1960s | Hackaday

    [David Given] frequently dives into retrocomputing, and we don’t just mean he refurbishes old computers. We mean things like creating a simulator and assembler for the OBP spaceflight computer, which was used in the OAO-3 Copernicus space telescope, pictured above. Far from being a niche and forgotten piece of technology, the On-Board Processor (OBP) was used in several spacecraft and succeeded by the Advanced On-board Processor (AOP), which in turn led to the NASA Standard Spaceflight Computer (NSSC-1), used in the Hubble Space Telescope. The OBP was also created entirely from NOR gates, which is pretty neat.

    One thing [David] learned in the process is that while this vintage piece of design has its idiosyncrasies, in general, the architecture has many useful features and is pleasant to work with. It is a bit slow, however. It runs at a mere 250 kHz and many instructions take several cycles to complete.

  • What you need to know about containers for Python | Opensource.com

    Python is a popular language for many applications. Those that run as backend services, now in the 2020s, are often run inside containers. For that to work, though, you have to build a container.

    Often, with microservice architectures, it makes sense to build a "root" base image, which all of your services get built on. Most of this article focuses on that base image since this is where it is easiest to make mistakes. However, I also cover the applications themselves because a good base without good applications isn't of much use.

  • NetBeans » PCLinuxOS

    Quickly and easily develop desktop, mobile, and web applications with Java, JavaScript, HTML5, PHP, C/C++ and more. Updated to 12.3

  • Java monitoring for custom targets with Cryostat

    By default, Cryostat automatically recognizes discoverable, valid targets with remote Java Management Extensions (JMX) and JMX-RMI-enabled connectivity. Discoverability is based on various mechanisms, including Kubernetes API-based service endpoints and the Java Discovery Protocol (JDP).

    With Cryostat 2.0, developers can now create connections by providing custom URLs for known potential Java application targets that are valid but not yet discoverable. You can save custom target definitions so they are available even after the Cryostat instance restarts. This feature is available on the Cryostat web front-end through the Create Target functionality introduced in this article.

    Cryostat 2.0 also introduces the new clientlib directory. By adding target application JARs to this directory, you can specify custom connection protocols for any custom targets you create. We'll show you how to add a custom target that uses one such connection protocol.

»

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today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.

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