mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-30 05:35:31 +00:00
99 lines
3.1 KiB
JavaScript
99 lines
3.1 KiB
JavaScript
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
|
* the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
* for the specific language governing rights and limitations under the
|
|
* License.
|
|
*
|
|
* The Original Code is JavaScript Engine testing utilities.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* Mozilla Foundation.
|
|
* Portions created by the Initial Developer are Copyright (C) 2005
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s): Jason Orendorff <jorendorff@mozilla.com>
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either the GNU General Public License Version 2 or later (the "GPL"), or
|
|
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the MPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
var gTestfile = 'dekker.js';
|
|
//-----------------------------------------------------------------------------
|
|
|
|
var summary = "Dekker's algorithm for mutual exclusion";
|
|
// Adapted from pseudocode in Wikipedia:
|
|
// http://en.wikipedia.org/wiki/Dekker%27s_algorithm
|
|
|
|
printStatus (summary);
|
|
|
|
var N = 500; // number of iterations
|
|
|
|
// the mutex mechanism
|
|
var f = [false, false];
|
|
var turn = 0;
|
|
|
|
// resource being protected
|
|
var counter = 0;
|
|
|
|
function worker(me) {
|
|
let him = 1 - me;
|
|
|
|
for (let i = 0; i < N; i++) {
|
|
// enter the mutex
|
|
f[me] = true;
|
|
while (f[him]) {
|
|
if (turn != me) {
|
|
f[me] = false;
|
|
while (turn != me)
|
|
; // busy wait
|
|
f[me] = true;
|
|
}
|
|
}
|
|
|
|
// critical section
|
|
let x = counter;
|
|
sleep(0.003);
|
|
counter = x + 1;
|
|
|
|
// leave the mutex
|
|
turn = him;
|
|
f[me] = false;
|
|
}
|
|
|
|
return 'ok';
|
|
}
|
|
|
|
var expect;
|
|
var actual;
|
|
|
|
if (typeof scatter == 'undefined' || typeof sleep == 'undefined') {
|
|
print('Test skipped. scatter or sleep not defined.');
|
|
expect = actual = 'Test skipped.';
|
|
} else {
|
|
var results = scatter([function () { return worker(0); },
|
|
function () { return worker(1); }]);
|
|
|
|
expect = "Thread status: [ok,ok], counter: " + (2 * N);
|
|
actual = "Thread status: [" + results + "], counter: " + counter;
|
|
}
|
|
|
|
reportCompare(expect, actual, summary);
|