Hi there!

I am Sebastian Schöner, and you are most likely here because you enjoy programming as well.

Choose your adventure:

• read my blog via the archive, or just continue below
• follow me on Mastodon or Bluesky or maybe even LinkedIn
• get in touch with my consulting business kerntief AB
• send me an e-mail
• play some of my poorly explained puzzle games like Block Machine or Patterna

• How to get thread create/exit callbacks on Windows

  Posted on July 7, 2025

  I recently needed to run a callback on thread shutdown and creation, on Windows. For exiting, you can apparently use FlsAlloc (MSDN), which is a part of the Fiber API. I’ve tried that, it works. But there are other options! [Read More]

• Stupid mistakes

  Posted on July 4, 2025

  Quite often, I see this: Forget it, I’m stupid, this is all wrong. [Read More]

• How does the Windows linker handle exported data?

  Posted on June 15, 2025

  I recently had to understand the details of what happens when on Windows you have a global variable in a DLL and try to use it from another. I did not find this spelled-out anywhere, so let’s change that. [Read More]

• How The Mods Made Me

  Posted on May 18, 2025

  Recently I got a message from someone that ran into a performance problem with a tool I wrote 15 years ago. On shutdown, the program would completely grind the entire machine to a halt for 3 minutes. Was I able to help them? A little bit, I think: We had... [Read More]

• Invisible loads and why I like free-standing functions

  Posted on May 8, 2025

  I have been grappling with a really silly C++ problem for a long time: I don’t like member functions, but I need to write member functions to get a decent programming UX. Member functions give me two things: scoping and discoverability. Scoping is the lesser of the two, because my... [Read More]

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