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structured concurrency

Making sure every task a function starts is finished or cancelled before the function returns.

Structured concurrency ties task lifetimes to a scope (join!, JoinSet dropped at scope end aborts its tasks), so no work outlives the code that started it.

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Examples

  • tokio::join!(quote(300, ..), quote(200, ..), quote(100, ..)) returns only after all three finish, in 300 ms rather than the 600 ms of awaiting them in turn.

  • Dropping a JoinSet aborts every task still in it, so no task outlives the function that owns the set.

See also

async task cancel safety concurrency
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