async task

A future handed to the runtime to run on its own, like a very light thread.

tokio::spawn turns a future into a task scheduled independently and returns a JoinHandle; many thousands of tasks can share a few worker threads.

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Examples

tokio::spawn(read_station("harbor", 300)) returns a JoinHandle; awaiting it gives a Result, so a task that panics shows up as Err instead of crashing main.