9 releases

0.3.0	May 30, 2026
0.2.6	May 18, 2025
0.2.5	Oct 18, 2024
0.2.3	Oct 7, 2023
0.1.0	Nov 25, 2022

#473 in Concurrency

3,019 downloads per month
Used in 36 crates (7 directly)

MIT/Apache

130KB
3K SLoC

mpsc

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mpsc provides Multiple Producer Single Consumer channels built on top of queue-ext. Supports multiple backing queue implementations, each with different characteristics.

Features

SegQueue channel — lock-free, crossbeam-based (default)
VecDeque channel — standard Rust VecDeque backed
Priority channel — items prioritized by key order
IndexMap channel — deduplication by key (last write wins)
Thread-safe Sender/Receiver types
Single-threaded LocalSender/LocalReceiver variants
Sink and Stream trait implementations
Type-erased channel API

Cargo Feature Flags

Feature	Description	Default
`segqueue`	Lock-free channel via `crossbeam::SegQueue`	yes
`vecdeque`	Channel backed by `std::collections::VecDeque`	no
`priority`	Priority channel via `box-collections::PriorityQueue`	no
`indexmap`	Deduplicating channel via `indexmap::IndexMap`	no

Basic Usage

use mpsc::segqueue_channel;
use futures::executor::block_on;

let (mut tx, mut rx) = segqueue_channel(10);
block_on(tx.send(42)).unwrap();
assert_eq!(block_on(rx.recv()), Some(42));

More Examples

channel-test.rs

Tests

cargo test -p mpsc --features "segqueue,vecdeque,priority,indexmap"

37 tests covering all 4 channel types, LocalSender/Receiver, clone, and drop semantics.

License

Licensed under either of Apache License 2.0 or MIT license at your option.

Dependencies

~3–4MB
~72K SLoC