# Feature catalog — tokio-rs/tokio

> Canonical page: https://codevetter.com/unpack/tokio/feature-catalog

# Feature catalog — tokio-rs/tokio

Scanned commit 2746c3ae26f8ac0af6023843a7f23d419c334efe (2026-10-02). Generated by codevetter codevetter 1.15.0 on 2026-10-02.

Source inspection; upstream code and tests were not executed.

User-facing functionality consists of composable Rust APIs rather than application routes or screens. Tokio provides execution, communication, I/O, timing, and operating-system control, with availability determined by features and targets. Companion libraries expose higher-level framing, cancellation, delayed queues, and stream composition. This catalog groups the inspected API families without claiming every public symbol was examined.
- Execution APIs include spawn, spawn_blocking, yield_now, LocalSet/spawn_local, JoinSet, JoinHandle, and AbortHandle; main/test macros generate runtime construction. — [tokio/src/task/mod.rs#L277-L320](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio/src/task/mod.rs#L277-L320) [tokio-macros/src/entry.rs#L468-L519](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio-macros/src/entry.rs#L468-L519)
- Networking exposes TCP streams/listeners/sockets, UDP, Unix sockets and FIFO pipes, Windows named pipes, and AsyncFd integration for other I/O resources. — [tokio/src/net/mod.rs#L3-L29](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio/src/net/mod.rs#L3-L29) [tokio/src/net/mod.rs#L38-L64](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio/src/net/mod.rs#L38-L64)
- AsyncRead and AsyncWrite define nonblocking poll interfaces; extension APIs provide operations such as write_all and flush, while filesystem APIs include whole-file writes and synchronization. — [tokio/src/io/async_read.rs#L7-L59](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio/src/io/async_read.rs#L7-L59) [tokio/src/io/async_write.rs#L6-L67](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio/src/io/async_write.rs#L6-L67) [tokio/src/fs/write.rs#L5-L26](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio/src/fs/write.rs#L5-L26) [tokio/src/fs/file.rs#L317-L322](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio/src/fs/file.rs#L317-L322)
- Synchronization exports broadcast, mpsc, oneshot, watch, Mutex, RwLock, Semaphore, Notify, Barrier, OnceCell, and SetOnce. — [tokio/src/sync/mod.rs#L454-L497](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio/src/sync/mod.rs#L454-L497)
- Timing APIs include sleep/sleep_until, interval/interval_at with MissedTickBehavior, and timeout/timeout_at; Timeout polls its wrapped future before checking expiration. — [tokio/src/time/mod.rs#L99-L116](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio/src/time/mod.rs#L99-L116) [tokio/src/time/timeout.rs#L204-L224](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio/src/time/timeout.rs#L204-L224)
- Command supports subprocess spawning and captured output; Child exposes wait-with-output, while signal::ctrl_c provides portable notification through platform implementations. — [tokio/src/process/mod.rs#L863-L866](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio/src/process/mod.rs#L863-L866) [tokio/src/process/mod.rs#L1065-L1071](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio/src/process/mod.rs#L1065-L1071) [tokio/src/process/mod.rs#L1446-L1472](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio/src/process/mod.rs#L1446-L1472) [tokio/src/signal/ctrl_c.rs#L1-L16](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio/src/signal/ctrl_c.rs#L1-L16)
- tokio-util provides codec, compatibility, I/O, task, and time modules; CancellationToken offers child propagation, and DelayQueue returns keyed values after deadlines. — [tokio-util/src/lib.rs#L25-L65](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio-util/src/lib.rs#L25-L65) [tokio-util/src/sync/cancellation_token.rs#L204-L247](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio-util/src/sync/cancellation_token.rs#L204-L247) [tokio-util/src/time/delay_queue.rs#L23-L55](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio-util/src/time/delay_queue.rs#L23-L55)
- tokio-stream supplies StreamExt adapters and resource wrappers; StreamMap merges dynamically inserted streams while preserving each emitted item's source key. — [tokio-stream/src/lib.rs#L76-L117](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio-stream/src/lib.rs#L76-L117) [tokio-stream/src/wrappers.rs#L10-L70](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio-stream/src/wrappers.rs#L10-L70) [tokio-stream/src/stream_map.rs#L9-L27](https://github.com/tokio-rs/tokio/blob/2746c3ae26f8ac0af6023843a7f23d419c334efe/tokio-stream/src/stream_map.rs#L9-L27)

Every claim links to its cited files at the pinned commit. Citations identify source evidence; they do not establish runtime correctness. Independent CodeVetter scan — not reviewed by upstream maintainers.

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