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Spawning
Spawning allows you to run a new asynchronous task in the background. This allows us to continue executing other code while it runs.
Say we have a web server that wants to accept connections without blocking the main thread.
To achieve this, we can use the async_std::task::spawn function to create and run a new task that handles the
connections. This function takes a future and returns a JoinHandle, which can be used to wait for the result of the
task once it's completed.
{{#include ../../examples/06_04_spawning/src/lib.rs:example}}
The JoinHandle returned by spawn implements the Future trait, so we can .await it to get the result of the task.
This will block the current task until the spawned task completes. If the task is not awaited, your program will
continue executing without waiting for the task, cancelling it if the function is completed before the task is finished.
{{#include ../../examples/06_04_spawning/src/lib.rs:join_all}}
To communicate between the main task and the spawned task, we can use channels provided by the async runtime used.