From c2b098bb46c9c17bb901a91073dae461dfad7ca8 Mon Sep 17 00:00:00 2001
From: Teemu Ikonen <teemu.ikonen@iki.fi>
Date: Sat, 11 Jan 2014 12:17:39 +0800
Subject: Queue calls drain if empty task list is pushed

---
 lib/async.js | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'lib')

diff --git a/lib/async.js b/lib/async.js
index cb6320d..7a4361f 100755
--- a/lib/async.js
+++ b/lib/async.js
@@ -675,6 +675,14 @@
           if(data.constructor !== Array) {
               data = [data];
           }
+          if(data.length == 0) {
+             // call drain immediately if there are no tasks
+             return async.setImmediate(function() {
+                 if (q.drain) {
+                     q.drain();
+                 }
+             });
+          }
           _each(data, function(task) {
               var item = {
                   data: task,
-- 
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