Posts tagged "async rust"

Drop is synchronous, and a lease or session often needs an await to be released. I tried four ways to do the cleanup and measured which ones actually ran, including during runtime shutdown.

Calling an async method through dyn Trait needs a boxed future. I measured what that box costs per call, with an allocation counter and a million calls, and where it actually matters.

I started from a small tokio service and hit five classic async Rust problems: a huge future, a future that is not Send, one blocking call that stalls everything, a select! loop that loses data, and a shutdown that hangs. One small model of the compiler and the runtime explains all five.

The usual Fn(&T) -> Fut bound cannot describe a future borrowing from each call. See how AsyncFn enables lending callbacks on stable Rust.

Pinning a Rust struct does not pin every field automatically. Learn structural pinning, safe projection, Drop obligations, and Future wrappers.