Posts by Jeremiah Peschka

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Jeremiah Peschka
288 posts
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Division Without Division

Jeremiah Peschka
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Not all processor architectures support the division operation. What if you’re writing software for one of these CPUs and you need to support arbitrary division? We’re in luck: we can perform the same operations that the CPU would perform. At least this thing can divide… It’s possible to perform division using a combination of left…
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Spinlocks: like regular padlocks, but with more spinning.

Spinlocks and You

Jeremiah Peschka
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Spinlocks are a building block of concurrent programs. As long as you have more than one actor in your system, you’re going to need to be able to control access. We use spinlocks to maintain mutual exclusion – if process 1 is changing something in memory, we want to prevent all other processes from doing…
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Picking Fights in Unity

Jeremiah Peschka
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As a fun summer project, I’m working on a Rogue-like video game. While our overall goal is to keep ourselves entertained while we learn something new, we’re keeping a careful approach to writing our software. Over the last week, we’ve decided it was time to implement combat. Rogue-like Redux If you play video games and…
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An empty stadium

There Is No Delete

Jeremiah Peschka
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I don’t have any Apple devices. I used to own a bunch of them, but over time I’ve switched from an iPhone to a Nexus phone; I have an Android tablet; my laptop and desktop both run Linux. Somewhere along the way, I decided that I should either delete my old Apple ID or remove…
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A dancing robot

Musings on OOP

Jeremiah Peschka
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N.B. This was originally written as a term paper for Portland State University’s CS202 – Programming Systems course. I’ve been working with object oriented programming (OOP) and software development for longer than I’d care to admit. I’ve found OOP to be cumbersome and prone to odd behavior. Shared mutable state has caused me a lot…
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PostgreSQL Data Checksums

Jeremiah Peschka
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If you use SQL Server, you’re used to the database doing page verification for you as the sensible default. If you want SQL Server to not verify data, you have to do a bit of extra work. Naturally, I would’ve assumed that this was the case with other databases since, after all, having good data on…
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How I Computer

Jeremiah Peschka
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I figured it would be fun to document the hardware and software that I use to get everything done on a regular basis. Even if it’s for nobody but future me, this should be a fun post to review later. Pictured: the computer I actually need. The Desktop I built the desktop computer myself, so…
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Rust Doc Days Follow Up

Jeremiah Peschka
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A few weeks ago, I mentioned Rust Doc Days. This was an event where the Rust community made a conscious effort to improve Rust’s documentation. Throughout this blog post, “we” refers to the quasi-official Rust docs team. How did it go? The first Rust Doc Days was, we felt, a successful event. We deliberately kept the event low…
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