The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/js/src/tests/js1_8/extensions/peterson.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,57 @@
     1.4 +// |reftest| skip
     1.5 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
     1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.9 +
    1.10 +//-----------------------------------------------------------------------
    1.11 +
    1.12 +var summary = "Peterson's algorithm for mutual exclusion";
    1.13 +
    1.14 +printStatus(summary);
    1.15 +
    1.16 +var N = 500;  // number of iterations
    1.17 +
    1.18 +// the mutex mechanism
    1.19 +var f = [false, false];
    1.20 +var turn = 0;
    1.21 +
    1.22 +// the resource being protected
    1.23 +var counter = 0;
    1.24 +
    1.25 +function worker(me) {
    1.26 +  let him = 1 - me;
    1.27 +
    1.28 +  for (let i = 0; i < N; i++) {
    1.29 +    // enter the mutex
    1.30 +    f[me] = true;
    1.31 +    turn = him;
    1.32 +    while (f[him] && turn == him)
    1.33 +      ;  // busy wait
    1.34 +
    1.35 +    // critical section
    1.36 +    let x = counter;
    1.37 +    sleep(0.003);
    1.38 +    counter = x+1;
    1.39 +
    1.40 +    // leave the mutex
    1.41 +    f[me] = false;
    1.42 +  }
    1.43 +
    1.44 +  return 'ok';
    1.45 +}
    1.46 +
    1.47 +var expect;
    1.48 +var actual;
    1.49 +
    1.50 +if (typeof scatter == 'undefined' || typeof sleep == 'undefined') {
    1.51 +  print('Test skipped. scatter or sleep not defined.');
    1.52 +  expect = actual = 'Test skipped.';
    1.53 +} else {
    1.54 +  var results = scatter ([function() { return worker(0); },
    1.55 +                          function() { return worker(1); }]);
    1.56 +  expect = "Thread status: [ok,ok], counter: " + (2 * N);
    1.57 +  actual = "Thread status: [" + results + "], counter: " + counter;
    1.58 +}
    1.59 +
    1.60 +reportCompare(expect, actual, summary);