| commit | 45469bfb3ef7eddb5019dcbf4b61db5ee00a2683 | [log] [tgz] |
|---|---|---|
| author | Jeff Vander Stoep <[email protected]> | Fri Nov 24 17:55:11 2023 +0000 |
| committer | Automerger Merge Worker <[email protected]> | Fri Nov 24 17:55:11 2023 +0000 |
| tree | 5010f1ffb2c623d15b0978f0945573c01a77be1b | |
| parent | 9153354dbf7537eef4bad4e0c466d15f94cc5867 [diff] | |
| parent | 75e9282f6f842defb003c199a9e5377593ab4cf1 [diff] |
Upgrade async_task to 4.5.0 am: 36665bc1d1 am: a4a3f97ff8 am: 75e9282f6f Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/async-task/+/2846078 Change-Id: I4d8fb1c5aa07333c896b95c9c3ad696ede305add 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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