Add alive method on arbiter

Author: Sytten

actix-rt/CHANGES.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 - Add `actix_rt::ArbiterBuilder` to allow user to configure the thread spawned for the arbiter.
+- Add `Arbiter::alive` and `ArbiterHandle::alive` to check is the arbiter is still alive.
 
 ## 2.10.0
 

actix-rt/src/arbiter.rs

@@ -71,6 +71,13 @@ impl ArbiterHandle {
         self.spawn(async { f() })
     }
 
+    /// Check if the [Arbiter] is still alive.
+    ///
+    /// Returns false if the [Arbiter] has been dropped, returns true otherwise.
+    pub fn alive(&self) -> bool {
+        !self.tx.is_closed()
+    }
+
     /// Instruct [Arbiter] to stop processing it's event loop.
     ///
     /// Returns true if stop message was sent successfully and false if the [Arbiter] has
@@ -367,6 +374,13 @@ impl Arbiter {
         self.spawn(async { f() })
     }
 
+    /// Check if the [Arbiter] is still alive.
+    ///
+    /// Returns false if the [Arbiter] has been dropped, returns true otherwise.
+    pub fn alive(&self) -> bool {
+        !self.tx.is_closed()
+    }
+
     /// Wait for Arbiter's event loop to complete.
     ///
     /// Joins the underlying OS thread handle. See [`JoinHandle::join`](thread::JoinHandle::join).