r/fsharp

Authors: Rajeshkumar Venugopal, Third Buyer Advisory, Claude 4.6

Description: A C++26 microkernel inspired by QNX Neutrino demonstrates that DMA is unnecessary for real-time audio transfer. Four user-space processes share a single 3840-byte stereo PCM buffer through capability-based memory grants — zero memory copies, zero DMA, zero kernel-mode drivers. The producer writes interleaved 48kHz/16-bit stereo samples, grants read-only capabilities to an audio driver, a VU meter (sub-region: left channel only), and a waveform visualizer (user-space read-back). IPC transfers only a 4-byte capability ID. The driver reads PCM data directly from the producer's buffer via std::span. Revoke cascades: munmap kills all grants. IPC round-trip latency: 1.31 microseconds (Apple M3, -O2), faster than QNX Neutrino on 600MHz ARM (~2us) and FreeRTOS context switch on Cortex-M4 (~7us). 14 invariants formally verified by Z3 (SMT solver): 9 IPC state machine proofs + 5 capability grant proofs. No counterexample exists for any invariant. 67 Catch2 tests, 252 assertions, all passing. BSD 2-Clause licensed. No Java, no Alloy, no DMA.

Keywords: microkernel, QNX, Neutrino, C++26, zero-copy, shared memory, capability-based security, DMA-free, real-time audio, IPC, message passing, send/receive/reply, priority inversion, formal verification, Z3, SMT, F#, alloy-fsx, Catch2, resource manager, PPS, publish-subscribe, stereo PCM, RTOS, embedded systems, BSD license

License: BSD-2-Clause

Repository:

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i just wanted something for my resume. i never used c# or java. i have python knowledge (fastapi, flask).

the only thing that kinda makes me not go fully into it is the thought of it being a (uninteresting thing to show off on my resume whilst simultainiously being very time consuming to learn) is that fear kinda legitimate or should i just say "fuck it" and follow my curiousity? i know this question is not on par with other questions here. are there some strong benefits. i heard f# makes you a better developer if you switch back to your naturally used language? i have some time off atm and im on a job search. i can take more then 5 months off. im adjusting my skills currently. im building a huge thing in typescript atm which is almost done. im leaning very heavily on just going with f#.

i have some friend who has been a .net dev for the past 8 years and i explained him some stuff about what iam planning and he took some time to understand that im not joking. so that is why i posted the question here.

Over the years I’ve dabbled with F# as being interesting and delightful without ever finding a use case that compelled me to stick with it (python / typescript libraries make them hard to step away from).

I saw something that reminded me that F# is close to Lean in that it supports dependent types. I found a few projects that try to build on F# for theorem proving:

Sylvester (archived)

F* (reasonably active but really more OCaml)

SharpLogic (moribund)

I liked playing with Lean tutorials recently and I was wondering if there is a good modern F# based prover with an engaging tutorial, and if anybody has poked at automating translations of the large base of Lean proofs into F# (yes LLMs etc I know I know). Lean does not strike me as a particularly pretty language.