| commit | 7006c6da6d4e48a973e95a6c527a25c8f28a2251 | [log] [tgz] |
|---|---|---|
| author | Jeff Vander Stoep <[email protected]> | Tue Jan 31 21:28:56 2023 +0000 |
| committer | Automerger Merge Worker <[email protected]> | Tue Jan 31 21:28:56 2023 +0000 |
| tree | 56bc37db1ea300bbe1dd13de239d70038b816283 | |
| parent | 91a21dba9dc6f512a9efce461282b9438a309337 [diff] | |
| parent | 84237fbd0c853159cc1c76a12c2be5e6c8575eb0 [diff] |
Update TEST_MAPPING am: 4f3e765eb4 am: 88cac09295 am: 84237fbd0c Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/async-task/+/2411853 Change-Id: I05efa6223ad75c8b7cf6d1f2e4e2ada11524aa4b Signed-off-by: Automerger Merge Worker <[email protected]>
Task abstraction for building executors.
To spawn a future onto an executor, we first need to allocate it on the heap and keep some state attached to it. The state indicates whether the future is ready for polling, waiting to be woken up, or completed. Such a stateful future is called a task.
All executors have a queue that holds scheduled tasks:
let (sender, receiver) = flume::unbounded();
A task is created using either spawn(), spawn_local(), or spawn_unchecked() which return a Runnable and a Task:
// A future that will be spawned. let future = async { 1 + 2 }; // A function that schedules the task when it gets woken up. let schedule = move |runnable| sender.send(runnable).unwrap(); // Construct a task. let (runnable, task) = async_task::spawn(future, schedule); // Push the task into the queue by invoking its schedule function. runnable.schedule();
The Runnable is used to poll the task's future, and the Task is used to await its output.
Finally, we need a loop that takes scheduled tasks from the queue and runs them:
for runnable in receiver { runnable.run(); }
Method run() polls the task's future once. Then, the Runnable vanishes and only reappears when its Waker wakes the task, thus scheduling it to be run again.
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