triple-buffer
mun
triple-buffer | mun | |
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4 | 26 | |
79 | 1,752 | |
- | 0.9% | |
6.3 | 7.3 | |
2 months ago | 19 days ago | |
Rust | Rust | |
Mozilla Public License 2.0 | GNU General Public License v3.0 or later |
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triple-buffer
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A lock-free single element generic queue
Great write up! I believe the colloquial name for this algorithm is a "lock-free triple buffer". Here's an implementation in Rust (I couldn't find any c/c++ examples) that has extremely thorough comments that might help completely wrap your head around the synchronization ordering. Rust uses the same semantics for atomic primitives as C11, so it should be pretty easy to match up with your implementation. I came to the same conclusion as you to solve an issue I had with passing arbitrarily large data between two threads in an RTOS system I was working with at my day job. It was an extremely satisfying moment, realizing the index variable was sufficient to communicate all the needed information between the two threads.
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Rust Is Hard, Or: The Misery of Mainstream Programming
Rust marks cross-thread shared memory as immutable in the general case, and allows you to define your own shared mutability constructs out of primitives like mutexes, atomics, and UnsafeCell. As a result you don't get rope to hang yourself with by default, but atomic orderings are more than enough rope to devise incorrect synchronizations (especially with more than 2 threads or memory locations). To quote an earlier post of mine:
In terms of shared-memory threading concurrency, Send and Sync, and the distinction between &T and &Mutex and &mut T, were a revelation when I first learned them. It was a principled approach to shared-memory threading, with Send/Sync banning nearly all of the confusing and buggy entangled-state codebases I've seen and continue to see in C++ (much to my frustration and exasperation), and &Mutex providing a cleaner alternative design (there's an excellent article on its design at http://cliffle.com/blog/rust-mutexes/).
My favorite simple concurrent data structure is https://docs.rs/triple_buffer/latest/triple_buffer/struct.Tr.... It beautifully demonstrates how you can achieve principled shared mutability, by defining two "handle" types (living on different threads), each carrying thread-local state (not TLS) and a pointer to shared memory, and only allowing each handle to access shared memory in a particular way. This statically prevents one thread from calling a method intended to run on another thread, or accessing fields local to another thread (since the methods and fields now live on the other handle). It also demonstrates the complexity of reasoning about lock-free algorithms (https://github.com/HadrienG2/triple-buffer/issues/14).
I find that writing C++ code the Rust way eliminates data races practically as effectively as writing Rust code upfront, but C++ makes the Rust way of thread-safe code extra work (no Mutex unless you make one yourself, and you have to simulate &(T: Sync) yourself using T const* coupled with mutable atomic/mutex fields), whereas the happy path of threaded C++ (raw non-Arc pointers to shared mutable memory) leads to pervasive data races caused by missing or incorrect mutex locking or atomic synchronization.
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Notes on Concurrency Bugs
In terms of shared-memory threading concurrency, Send and Sync, and the distinction between &T and &Mutex and &mut T, were a revelation when I first learned them. It was a principled approach to shared-memory threading, with Send/Sync banning nearly all of the confusing and buggy entangled-state codebases I've seen and continue to see in C++ (much to my frustration and exasperation), and &Mutex providing a cleaner alternative design (there's an excellent article on its design at http://cliffle.com/blog/rust-mutexes/).
My favorite simple concurrent data structure is https://docs.rs/triple_buffer/latest/triple_buffer/struct.Tr.... It beautifully demonstrates how you can achieve principled shared mutability, by defining two "handle" types (living on different threads), each carrying thread-local state (not TLS) and a pointer to shared memory, and only allowing each handle to access shared memory in a particular way. This statically prevents one thread from calling a method intended to run on another thread, or accessing fields local to another thread (since the methods and fields now live on the other handle). It also demonstrates the complexity of reasoning about lock-free algorithms (https://github.com/HadrienG2/triple-buffer/issues/14).
I suppose &/&mut is also a safeguard against event-loop and reentrancy bugs (like https://github.com/quotient-im/Quaternion/issues/702). I don't think Rust solves the general problem of preventing deadlocks within and between processes (which often cross organizational boundaries between projects and distinct codebases, with no clear contract on allowed behavior and which party in a deadlock is at fault), and non-atomicity between processes on a single machine (see my PipeWire criticism at https://news.ycombinator.com/item?id=31519951). File saving is also difficult (https://danluu.com/file-consistency/), though I find that fsync-then-rename works well enough if you don't need to preserve metadata or write through file (not folder) symlinks.
- A bug that doesn’t exist on x86: Exploiting an ARM-only race condition
mun
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Hotswapping on native languages?
Mun is a statically typed language that compiles to machine code with LLVM, designed to be hot-reloadable: https://mun-lang.org/.
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Best language to use as a scripting lang for my rust app
Perhaps https://mun-lang.org? Might be a bit raw for your needs tho.
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Mun v0.4.0 released
But that’s not all! In total, this release contains 111 pull requests made by 5 of our community contributors and our two Core Team members & Dependabot. Thanks for having our back! For a full list have a look at the changelog, but the main improvements are:
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Mun v0.4.0: a statically-typed scripting language like Rust, written in Rust
Whenever I read about Mun, I'm always really, really intrigued… Until I remember that it currently has no string type and support for one is not currently planned. That's a bit of a shame, IMHO, because otherwise, this looks great!
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Wren is a small, fast, class-based concurrent scripting language
There's mun [1] which is statically typed and AOT compiled.
1: https://github.com/mun-lang/mun
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Lessons from Writing a Compiler
From the reverse-dependencies of the salsa crate, the (archived) Lark compiler used it and the Mun compiler uses it.
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(async) Rust doesn't have to be hard
I notice that there are projects like mun trying to achieve a similar goal, but I'm kind of curious why they are not getting much attention from the community.
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Rust Is Hard, Or: The Misery of Mainstream Programming
Have you heard of https://mun-lang.org/ ?
It's an embeddable scripting language with the goal of being a Rust-like language that supports hot reloading of functions AND data. To achieve the latter, it uses GC'ed memory such that memory can easily be mapped when the memory's type changes.
It's still in early development but maybe one day will serve your needs :)
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After working on our Godot + Rust game fulltime for one year it is now up on Steam
In terms of pure Rust engines/frameworks it seems the overall "problem" is lack of scripting, at least from my perspective. Mun seemed extremely interesting, but since even the project itself says "don't use it" I guess it's not a real option, and considering the amount of time we spent on the GDScript/Rust integration I'm a little worried that rolling something more custom would be even less efficient.
- Python interpreter written in rust reaches 10000 commits
What are some alternatives?
bbqueue - A SPSC, lockless, no_std, thread safe, queue, based on BipBuffers
Rhai - Rhai - An embedded scripting language for Rust.
left-right - A lock-free, read-optimized, concurrency primitive.
rune - An embeddable dynamic programming language for Rust.
Ionide-vim - F# Vim plugin based on FsAutoComplete and LSP protocol
janet - A dynamic language and bytecode vm
scrap - 📸 Screen capture made easy!
lobster - The Lobster Programming Language
jakt - The Jakt Programming Language
RustPython - A Python Interpreter written in Rust
loom - Concurrency permutation testing tool for Rust.
tl - The compiler for Teal, a typed dialect of Lua