embassy-sync: Add capacity and free_capacity functions to Channel

embassy-sync/CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
-- Add `len`, `is_empty` and `is_full` functions to `Channel`.
+- Add `capacity`, `free_capacity`, `len`, `is_empty` and `is_full` functions to `Channel`.
 
 ## 0.5.0 - 2023-12-04
 

embassy-sync/src/channel.rs

@@ -620,6 +620,18 @@ where
         self.lock(|c| c.try_receive())
     }
 
+    /// Returns the maximum number of elements the channel can hold.
+    pub const fn capacity(&self) -> usize {
+        N
+    }
+
+    /// Returns the free capacity of the channel.
+    ///
+    /// This is equivalent to `capacity() - len()`
+    pub fn free_capacity(&self) -> usize {
+        N - self.len()
+    }
+
     /// Returns the number of elements currently in the channel.
     pub fn len(&self) -> usize {
         self.lock(|c| c.len())