Tokio v1.37.0

1.37.0 (March 28th, 2024)

Added

• fs: add set_max_buf_size to tokio::fs::File (#6411)
• io: add try_new and try_with_interest to AsyncFd (#6345)
• sync: add forget_permits method to semaphore (#6331)
• sync: add is_closed, is_empty, and len to mpsc receivers (#6348)
• sync: add a rwlock() method to owned RwLock guards (#6418)
• sync: expose strong and weak counts of mpsc sender handles (#6405)
• sync: implement Clone for watch::Sender (#6388)
• task: add TaskLocalFuture::take_value (#6340)
• task: implement FromIterator for JoinSet (#6300)

Changed

• io: make io::split use a mutex instead of a spinlock (#6403)

Fixed

• docs: fix docsrs build without net feature (#6360)
• macros: allow select with only else branch (#6339)
• runtime: fix leaking registration entries when os registration fails (#6329)

Documented

• io: document cancel safety of AsyncBufReadExt::fill_buf (#6431)
• io: document cancel safety of AsyncReadExt's primitive read functions (#6337)
• runtime: add doc link from Runtime to #[tokio::main] (#6366)
• runtime: make the enter example deterministic (#6351)
• sync: add Semaphore example for limiting the number of outgoing requests (#6419)
• sync: fix missing period in broadcast docs (#6377)
• sync: mark mpsc::Sender::downgrade with #[must_use] (#6326)
• sync: reorder const_new before new_with (#6392)
• sync: update watch channel docs (#6395)
• task: fix documentation links (#6336)

Changed (unstable)

• runtime: include task Id in taskdumps (#6328)
• runtime: panic if unhandled_panic is enabled when not supported (#6410)