More channel

lib/Language/concurrency.pod

@@ -339,6 +339,37 @@ channel is closed:
         say $r;
     }
 
+There is also the non-blocking L<method poll|/type/Channel#method_poll>
+which returns an available item from the channel or L<Nil> if there
+is no item or the channel is closed, this does of course mean that the
+channel must be checked to determine whether it is closed:
+
+    my $c = Channel.new;
+
+    start {
+        my $closed = $c.closed;
+        loop {
+            if $c.poll -> $item {
+                say $item;
+            }
+            elsif $closed {
+                last;
+            }
+        }
+    }
+
+    await (^10).map: -> $r {
+        start {
+            sleep $r;
+            $c.send($r);
+        }
+    }
+    $c.close;
+
+The L<method closed|/type/Channel#method_closed> returns a L<Promise> that
+will be kept (and consequently will evaluate to True in a boolean context,)
+when the channel is closed.
+
 =head1 Low-level APIs
 
 =head2 Threads