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/* <copyright>
This file contains proprietary software owned by Motorola Mobility, Inc.<br/>
No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.<br/>
(c) Copyright 2011 Motorola Mobility, Inc. All Rights Reserved.
</copyright> */
/**
Defines [setImmediate()]{@link setImmediate} and [clearImmediate()]{@link clearImmediate} shim functions.
@see setImmediate
@see clearImmediate
@module montage/core/shim/timers
*/
/**
@function
@name setImmediate
@global
*/
/**
@function
@name clearImmediate
@global
*/
(function (global) {
var nextTick;
if (typeof process !== "undefined") {
nextTick = process.nextTick;
} else if (typeof MessageChannel !== "undefined") {
// http://www.nonblocking.io/2011/06/windownexttick.html
var channel = new MessageChannel();
// linked list of tasks (single, with head node)
var head = {}, tail = head;
channel.port1.onmessage = function () {
var next = head.next;
var task = next.task;
head = next;
task();
};
nextTick = function (task) {
tail = tail.next = {task: task};
channel.port2.postMessage(void 0);
}
} else if (typeof setTimeout !== "undefined") {
nextTick = function (callback) {
setTimeout(callback, 0);
};
} else {
throw new Error("Can't shim setImmediate.");
}
if (typeof setImmediate === "undefined") {
var nextHandle = 0;
var handles = {};
global.setImmediate = function setImmediate(callback) {
var handle = nextHandle++;
var args = arguments.length > 1 ?
Array.prototype.slice.call(arguments, 1) :
void 0;
handles[handle] = true;
nextTick(function () {
if (handles[handle]) {
callback.apply(void 0, args);
delete handles[handle];
}
});
return handle;
};
global.clearImmediate = function clearImmediate(handle) {
delete handles[handle];
};
}
// Make this work as a <script> for bootstrapping montage.js
if (typeof bootstrap !== "undefined") {
bootstrap("core/shim/timers", function () {});
}
})(typeof global === "undefined" ? window : global);
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