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