added possibility to push taskbulks, added test

Conflicts:

	lib/async.js

README.md

@@ -701,6 +701,7 @@ methods:
   alter the concurrency on-the-fly.
 * push(task, [callback]) - add a new task to the queue, the callback is called
   once the worker has finished processing the task.
+  instead of a single task, an array of tasks can be submitted. the respective callback is used for every task in the list.
 * saturated - a callback that is called when the queue length hits the concurrency and further tasks will be queued
 * empty - a callback that is called when the last item from the queue is given to a worker
 * drain - a callback that is called when the last item from the queue has returned from the worker
@@ -729,6 +730,12 @@ __Example__
         console.log('finished processing bar');
     });
 
+    // add some items to the queue (batch-wise)
+
+    q.push([{name: 'baz'},{name: 'bay'},{name: 'bax'}], function (err) {
+        console.log('finished processing bar');
+    });
+
 
 ---------------------------------------
 

lib/async.js

@@ -595,9 +595,19 @@
             empty: null,
             drain: null,
             push: function (data, callback) {
-                q.tasks.push({data: data, callback: typeof callback === 'function' ? callback : null});
-                if(q.saturated && q.tasks.length == concurrency) q.saturated();
-                async.nextTick(q.process);
+                if(data.constructor !== Array) {
+                    data = [data];
+                }
+                _forEach(data, function(task) {
+                    q.tasks.push({
+                        data: task,
+                        callback: typeof callback === 'function' ? callback : null
+                    });
+                    if (q.saturated && q.tasks.length == concurrency) {
+                        q.saturated();
+                    }
+                    async.nextTick(q.process);
+                });
             },
             process: function () {
                 if (workers < q.concurrency && q.tasks.length) {

test/test-async.js

@@ -1358,6 +1358,42 @@ exports['queue push without callback'] = function (test) {
     }, 200);
 };
 
+exports['queue bulk task'] = function (test) {
+    var call_order = [],
+        delays = [40,20,60,20];
+
+    // worker1: --1-4
+    // worker2: -2---3
+    // order of completion: 2,1,4,3
+
+    var q = async.queue(function (task, callback) {
+        setTimeout(function () {
+            call_order.push('process ' + task);
+            callback('error', task);
+        }, delays.splice(0,1)[0]);
+    }, 2);
+
+    q.push( [1,2,3,4], function (err, arg) {
+        test.equal(err, 'error');
+        call_order.push('callback ' + arg);
+    });
+
+    test.equal(q.length(), 4);
+    test.equal(q.concurrency, 2);
+
+    setTimeout(function () {
+        test.same(call_order, [
+            'process 2', 'callback 2',
+            'process 1', 'callback 1',
+            'process 4', 'callback 4',
+            'process 3', 'callback 3'
+        ]);
+        test.equal(q.concurrency, 2);
+        test.equal(q.length(), 0);
+        test.done();
+    }, 200);
+};
+
 exports['memoize'] = function (test) {
     test.expect(4);
     var call_order = [];