Posts tagged "concurrency"

A concurrent refresh design using local single-flight work, database versions, conditional writes, and recovery rules for providers that rotate refresh tokens.

Follow Rust drop scopes through if let, match, and tail expressions, including the Edition 2024 changes affecting locks and temporary borrows.

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.

Async cancellation usually means dropping a future after Pending. See how select loops lose partial progress and how to design restartable operations.

Two requests read the same row, both change it, and the second save quietly erases the first. A version number turns that silent bug into a conflict you can catch. Here is how optimistic locking works.