From 3d97c9e431d7fcb20b1b30bc15c34ccffee03c79 Mon Sep 17 00:00:00 2001
From: datdenkikniet <jcdra1@gmail.com>
Date: Sat, 22 Apr 2023 21:27:26 +0200
Subject: Move deprecated migration guides to deprecated folder

---
 book/en/src/migration_v1_v2/async_tasks.md | 55 ++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 book/en/src/migration_v1_v2/async_tasks.md

(limited to 'book/en/src/migration_v1_v2/async_tasks.md')

diff --git a/book/en/src/migration_v1_v2/async_tasks.md b/book/en/src/migration_v1_v2/async_tasks.md
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@@ -0,0 +1,55 @@
+# Using `async` softare tasks.
+
+There have been a few changes to software tasks. They are outlined below.
+
+### Software tasks must now be `async`.
+
+All software tasks are now required to be `async`.
+
+#### Required changes.
+
+All of the tasks in your project that do not bind to an interrupt must now be an `async fn`. For example:
+
+``` rust
+#[task(
+    local = [ some_resource ],
+    shared = [ my_shared_resource ],
+    priority = 2
+)]
+fn my_task(cx: my_task::Context) {
+    cx.local.some_resource.do_trick();
+    cx.shared.my_shared_resource.lock(|s| s.do_shared_thing());
+}
+```
+
+becomes
+
+``` rust
+#[task(
+    local = [ some_resource ],
+    shared = [ my_shared_resource ],
+    priority = 2
+)]
+async fn my_task(cx: my_task::Context) {
+    cx.local.some_resource.do_trick();
+    cx.shared.my_shared_resource.lock(|s| s.do_shared_thing());
+}
+```
+
+## Software tasks may now run forever
+
+The new `async` software tasks are allowed to run forever, on one precondition: **there must be an `await` within the infinite loop of the task**. An example of such a task:
+
+``` rust
+#[task(local = [ my_channel ] )]
+async fn my_task_that_runs_forever(cx: my_task_that_runs_forever::Context) {
+    loop {
+        let value = cx.local.my_channel.recv().await;
+        do_something_with_value(value);
+    }
+}
+```
+
+## `spawn_after` and `spawn_at` have been removed.
+
+As discussed in the [Migrating to `rtic-monotonics`](./monotonics.md) chapter, `spawn_after` and `spawn_at` are no longer available.
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