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 speed up random memory accesses

  Posted on July 28, 2025

  At some point when optimizing software, you are left with a soup of pointers that you just have to dereference, even though you know that you are going to suffer a cache miss for every single read. Common knowledge suggests that you just should not read from random pointers in... [Read More]

• How to iterate over section data in C++

  Posted on July 14, 2025

  Last time, we looked at callbacks you can directly embed into your binaries on Windows that are then called for every thread on start/end. The runtime is using this to initialize thread-locals that require more than just memcpy. Today, we are going to look at a mechanism that can be... [Read More]

• 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]

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