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Monoio – A thread-per-core Rust async runtime with io_uring
Oh, I have written my own share of userspace C context switching libraries, I know all the gory the details :). For example see my minimalist [1] stackful coroutine library: the full context switching logic is three inline asm instructions (99% of the complexity in that code is to transparently support throwing exceptions across coroutine boundaries with no overhead in the happy path).
You need compiler help for the custom calling convention support and possibly to optimize away the context switching overhead for stackful coroutines, which is something that compilers can already do for stackless coroutines.
The duff device is just a way to simulate stackless coroutines (i.e. async/await or whateverer) in plain C, in a way that the compiler can still optimize quite well.
[1] https://github.com/gpderetta/delimited/blob/master/delimited...
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Declarative, non-intrusive, compile-time C++ reflection for audio plug-ins
Using gcc extended asm you can pass literal constants to the asm and they will be expanded textually (or at least their address will). I don't think the details are fully documented anywhere and I had to use intel syntax to make it work, but it might be possible even wit AT&T syntax.
Take a look a this[1] for example. See how trampoline, the destructor and the size are passed in with the 'i' constraint and are referred to their value with the %cX constraint (yes, the code is write only and even with a lot of comments I have only the most vague idea of what I was trying to do here).
Probably more work is require for PIC though.
[1] https://github.com/gpderetta/delimited/blob/7e755d643ee45897...
What are some alternatives?
KFR - A benchmark for comparison of FFT algorithms performance
actix-net - A collection of lower-level libraries for composable network services.
eos - A lightweight 3D Morphable Face Model library in modern C++
wg-async - Working group dedicated to improving the foundations of Async I/O in Rust
inspectrum - Radio signal analyser
monoio - Rust async runtime based on io-uring.
DaisySP - A Powerful DSP Library in C++
vst3_public_sdk - VST 3 Implementation Helper Classes And Examples
libnop - libnop: C++ Native Object Protocols
essentia - C++ library for audio and music analysis, description and synthesis, including Python bindings
gensound - Pythonic audio processing and generation framework
Fundamental