embassy-sync: Add capacity, free_capacity, len, is_empty and is_full functions to PubSubChannel

1 files changed, 39 insertions, 0 deletions

diff --git a/embassy-sync/src/pubsub/mod.rs b/embassy-sync/src/pubsub/mod.rs
index 6afd54af5..754747ab8 100644
--- a/embassy-sync/src/pubsub/mod.rs
+++ b/embassy-sync/src/pubsub/mod.rs
@@ -160,6 +160,33 @@ impl<M: RawMutex, T: Clone, const CAP: usize, const SUBS: usize, const PUBS: usi
     pub fn dyn_immediate_publisher(&self) -> DynImmediatePublisher<T> {
         DynImmediatePublisher(ImmediatePub::new(self))
     }
+
+    /// Returns the maximum number of elements the channel can hold.
+    pub const fn capacity(&self) -> usize {
+        CAP
+    }
+
+    /// Returns the free capacity of the channel.
+    ///
+    /// This is equivalent to `capacity() - len()`
+    pub fn free_capacity(&self) -> usize {
+        CAP - self.len()
+    }
+
+    /// Returns the number of elements currently in the channel.
+    pub fn len(&self) -> usize {
+        self.inner.lock(|inner| inner.borrow().len())
+    }
+
+    /// Returns whether the channel is empty.
+    pub fn is_empty(&self) -> bool {
+        self.inner.lock(|inner| inner.borrow().is_empty())
+    }
+
+    /// Returns whether the channel is full.
+    pub fn is_full(&self) -> bool {
+        self.inner.lock(|inner| inner.borrow().is_full())
+    }
 }
 
 impl<M: RawMutex, T: Clone, const CAP: usize, const SUBS: usize, const PUBS: usize> PubSubBehavior<T>
@@ -366,6 +393,18 @@ impl<T: Clone, const CAP: usize, const SUBS: usize, const PUBS: usize> PubSubSta
     fn unregister_publisher(&mut self) {
         self.publisher_count -= 1;
     }
+
+    fn len(&self) -> usize {
+        self.queue.len()
+    }
+
+    fn is_empty(&self) -> bool {
+        self.queue.is_empty()
+    }
+
+    fn is_full(&self) -> bool {
+        self.queue.is_full()
+    }
 }
 
 /// Error type for the [PubSubChannel]