shred 0.10.2

Dispatches systems in parallel which need read access to some resources, and write access to others.

shred - Shared resource dispatcher

Build Status MIT/Apache LoC

This library allows to dispatch systems, which can have interdependencies, shared and exclusive resource access, in parallel.


extern crate shred;

use shred::{DispatcherBuilder, Read, Resource, ResourceId, System, SystemData, World, Write};

#[derive(Debug, Default)]
struct ResA;

#[derive(Debug, Default)]
struct ResB;

#[derive(SystemData)] // Provided with `shred-derive` feature
struct Data<'a> {
    a: Read<'a, ResA>,
    b: Write<'a, ResB>,

struct EmptySystem;

impl<'a> System<'a> for EmptySystem {
    type SystemData = Data<'a>;

    fn run(&mut self, bundle: Data<'a>) {
        println!("{:?}", &*bundle.a);
        println!("{:?}", &*bundle.b);

fn main() {
    let mut world = World::empty();
    let mut dispatcher = DispatcherBuilder::new()
        .with(EmptySystem, "empty", &[])

    dispatcher.dispatch(&mut world);

Please see the benchmark for a bigger (and useful) example.

Required Rust version

1.38 stable


  • lock-free
  • no channels or similar functionality used (-> less overhead)
  • allows both automated parallelization and fine-grained control


Contribution is highly welcome! If you'd like another feature, just create an issue. You can also help out if you want to; just pick a "help wanted" issue. If you need any help, feel free to ask!

All contributions are assumed to be dual-licensed under MIT/Apache-2.


shred is distributed under the terms of both the MIT license and the Apache License (Version 2.0).