-
InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
-
-
SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
I'm creating a hobby operating system in Nim (early stages). After an initial attempt[0] I decided to start over[1] and document my journey in building it[2]. The focus for me is on learning low-level systems programming and enjoying the journey, rather than building something production ready.
[0] https://github.com/khaledh/axiom
[1] https://github.com/khaledh/fusion
[2] https://0xc0ffee.netlify.app/osdev/01-intro.html
I'm creating a hobby operating system in Nim (early stages). After an initial attempt[0] I decided to start over[1] and document my journey in building it[2]. The focus for me is on learning low-level systems programming and enjoying the journey, rather than building something production ready.
[0] https://github.com/khaledh/axiom
[1] https://github.com/khaledh/fusion
[2] https://0xc0ffee.netlify.app/osdev/01-intro.html
Working on Honcho[0] a platform for personalizing LLM based applications to individual end users.
It was inspired when working on a tutoring service and realizing that the key problem of AI tutors was that they didn't know the student well enough. As we started tackling the problem other builders around us mentioned similar concerns. It's been pretty hard to explain the value to those not experiencing the same problems, but it's slowly catching on.
[0] https://github.com/plastic-labs/honcho
I'm working on a gemini web browser called astro (https://github.com/blmayer/astro), so far it has 50 stars, I'm super happy.
Also I have a SMPT server featuring automatic encryption using the WKD standard: https://dovel.email the idea is that people could self host their email easily. Maybe I'll make a SAAS for this.
My webring is mostly for fun and testing stuff: https://derelict.garden
Now they are hosted on my raspberry pi zero on my living room!
I had need for a special purpose lock that solved this problem: There are `N` task sharing a single resource. It is incorrect for the `n`th task to acquire a lock on it until after the `n - 1`th task has released its lock. When the `N - 1`th task releases its lock the `0`th task may acquire the lock again.
I couldn't find any lock off the shelf that solved this, or a clean way to hack it with a fair mutex. So I wrote my own, and I'm pretty sure it's correct (1).
It's like a ticket lock, except the total number of tickets is known up front so every task can get one ticket. To acquire a lock is one CAS, where the lock is acquired iff the "current" value of the lock matches the ticket value of the task, if so we swap in a magic LOCK value. When the writer releases the lock it writes (ticket + 1) % num_tickets back to current so the lock can be acquired by the next task.
There's a deadlock condition though - if one task is cancelled while any other task is outstanding, no other task may acquire the lock, even if the cancelled task didn't acquire it!
To deal with that, the lock is poisoned with a magic POISON value. Then when any other task attempts to acquire the lock, but its value is POISON, then an error is returned and those tasks may be cancelled accordingly.
It's be possible to support adding/removing tasks concurrently by replacing the tickets with a circularly linked list of atomic pointers, so when one task is cancelled the "next" of the "prev" item can be atomically swapped, but I don't have a use case for that and it's annoying enough to write in Rust that I didn't want to bother with it.
(1) The code for this is here: https://github.com/m-hilgendorf/sequex/. I call it "sequex" for sequence-mutex. It could also be called a round-robin lock or something like that.
A small side project I wrote for my own use:
https://github.com/russellw/chatgpt-unpack
ChatGPT allows you to download an archive of all the conversations you have had with it, so you can do things like search for past conversations with your choice of search tool. The archive is in JSON format, not quite usable directly, so I wrote a program to unpack it to plain text.
https://github.com/mihemihe/myADMonitor/
Active Directory monitor tool that tracks changes committed in real time.
I used it internally when I had to bulk changes or when I have to replicate AD during migrations.
Right now I am working on a new frontend which I will be integrated to the tool soon.