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1 files changed, 80 insertions, 0 deletions

diff --git a/node_modules/when/lib/Scheduler.js b/node_modules/when/lib/Scheduler.js
new file mode 100644
index 00000000..ffc8c36b
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+++ b/node_modules/when/lib/Scheduler.js
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+/** @license MIT License (c) copyright 2010-2014 original author or authors */
+/** @author Brian Cavalier */
+/** @author John Hann */
+
+(function(define) { 'use strict';
+define(function() {
+
+	// Credit to Twisol (https://github.com/Twisol) for suggesting
+	// this type of extensible queue + trampoline approach for next-tick conflation.
+
+	/**
+	 * Async task scheduler
+	 * @param {function} async function to schedule a single async function
+	 * @constructor
+	 */
+	function Scheduler(async) {
+		this._async = async;
+		this._running = false;
+
+		this._queue = new Array(1<<16);
+		this._queueLen = 0;
+		this._afterQueue = new Array(1<<4);
+		this._afterQueueLen = 0;
+
+		var self = this;
+		this.drain = function() {
+			self._drain();
+		};
+	}
+
+	/**
+	 * Enqueue a task
+	 * @param {{ run:function }} task
+	 */
+	Scheduler.prototype.enqueue = function(task) {
+		this._queue[this._queueLen++] = task;
+		this.run();
+	};
+
+	/**
+	 * Enqueue a task to run after the main task queue
+	 * @param {{ run:function }} task
+	 */
+	Scheduler.prototype.afterQueue = function(task) {
+		this._afterQueue[this._afterQueueLen++] = task;
+		this.run();
+	};
+
+	Scheduler.prototype.run = function() {
+		if (!this._running) {
+			this._running = true;
+			this._async(this.drain);
+		}
+	};
+
+	/**
+	 * Drain the handler queue entirely, and then the after queue
+	 */
+	Scheduler.prototype._drain = function() {
+		var i = 0;
+		for (; i < this._queueLen; ++i) {
+			this._queue[i].run();
+			this._queue[i] = void 0;
+		}
+
+		this._queueLen = 0;
+		this._running = false;
+
+		for (i = 0; i < this._afterQueueLen; ++i) {
+			this._afterQueue[i].run();
+			this._afterQueue[i] = void 0;
+		}
+
+		this._afterQueueLen = 0;
+	};
+
+	return Scheduler;
+
+});
+}(typeof define === 'function' && define.amd ? define : function(factory) { module.exports = factory(); }));