blob: de8514967e031308a6a5f93749f26a3a5958d8f0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
// |reftest| skip
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//-----------------------------------------------------------------------
var summary = "Peterson's algorithm for mutual exclusion";
printStatus(summary);
var N = 500; // number of iterations
// the mutex mechanism
var f = [false, false];
var turn = 0;
// the 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;
turn = him;
while (f[him] && turn == him)
; // busy wait
// critical section
let x = counter;
sleep(0.003);
counter = x+1;
// leave the mutex
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);
|
