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-# cq
-Concurrent Queues for Javascript
+# ccq
+**Javascript queues with concurrency control!**
+
+You can think of a controlled-concurrency queue as an array of tasks with a positive concurrency *n*, which means that at any given time, at most *n* of the queued tasks are being executed concurrently, while the rest are either waiting to commence execution, or have finished executing.
+
+### The Queue API
+
+#### `var queue = new Queue(n);`
+
+This constructor function creates a new queue with a concurrency of `n`. You may add as many tasks to the queue as needed, but no more than `n` of these tasks are allowed to execute concurrently at any given time. If no `n` is passed, we get a queue with unbounded concurrency.
+
+```javascript
+var Queue = require("queue").Queue;
+
+// creates a new queue with a concurrency of 5
+var q = new Queue(5);
+```
+
+
+#### `queue.add(task[, taskArgs...]);`
+
+The `add()` method adds a new task to the queue. At this point, if the queue concurrency hasn't been reached, then `task` is invoked immediately with the arguments `taskArgs`. Otherwise, `task` is added to a list of tasks already waiting to be executed. Therefore, once a task has been added to the queue, it may exist in one of 3 mutually exclusive states at any given time: **ACTIVE**, **WAITING** or **COMPLETED**.
+
+Each task is also passed a `callback(error, results)` function as its last argument. The task **must** call this function once it has finished executing, to inform the queue of its completion. In case of a successfull completion, the `error` argument passed to the `callback` **must** be `null`, and the `results` argument must contain a single value containing the result of the function execution.
+
+```javascript
+// adds a new `uploadFile` task to the queue
+queue.add(uploadFile, [files[i]], onUpload);
+```
+
+#### `queue.await(callback);`
+
+Finally, the `await()` method can be used to tell the queue that no further tasks will be added to it, and that the `callback` function must be invoked once all the tasks have finished executing. This callback will be invoked with a list (`results`) of exceptions or return values from every task. The elements in `results` will match the order in which their corresponding tasks were added to the queue. For exceptions, the `isError` flag of the `result` element will be set. Result data (exception or return value) is available in `result.data`.
+
+```javascript
+// the callback passed to `.await()` will be invoked once all the tasks have finished
+queue.await(function(results) {
+    var failedUploads = results.filter(function (result) { return result.isError; });
+    console.log('Finished uploading. ' + results.length - failedUploads.length + ' successful, ' + failedUploads.length + ' failed.');
+});
+```