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Concurrency

Routines

Sailfin’s lightweight concurrency primitive:

fn main() ![io, clock] {
    routine {
        print.info("Running in background");
        sleep(1000);
        print.info("Done");
    }

    print.info("Main continues");
}

Channels

Typed channels for communication between routines:

fn main() ![io] {
    let ch = Channel<String>.new();

    routine {
        ch.send("hello from routine");
    }

    let msg = ch.recv();
    print.info("Got: {{msg}}");
}

Async / Await

For IO-bound operations:

async fn fetch_data(url: String) -> Response ![net] {
    return await http.get(url);
}

Scoped Concurrency

fn process_batch(items: Array<Item>) ![io] {
    scope {
        for item in items {
            routine {
                process(item);
            }
        }
    }
    // All routines complete before scope exits
    print.info("Batch complete");
}

Next Steps