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
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
// |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration()['arm64-simulator'])) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics
// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-atomics.compareexchange
description: Test Atomics.compareExchange on arrays that allow atomic operations.
includes: [testAtomics.js, testTypedArray.js]
features: [ArrayBuffer, Atomics, DataView, SharedArrayBuffer, Symbol, TypedArray]
---*/
const sab = new SharedArrayBuffer(1024);
const ab = new ArrayBuffer(16);
const views = intArrayConstructors.slice();
testWithTypedArrayConstructors(function(TA) {
// Make it interesting - use non-zero byteOffsets and non-zero indexes.
const view = new TA(sab, 32, 20);
const control = new TA(ab, 0, 2);
// Performs the exchange
view[8] = 0;
assert.sameValue(
Atomics.compareExchange(view, 8, 0, 10),
0,
'Atomics.compareExchange(view, 8, 0, 10) returns 0'
);
assert.sameValue(view[8], 10, 'The value of view[8] is 10');
view[8] = 0;
assert.sameValue(Atomics.compareExchange(view, 8, 1, 10), 0,
'Atomics.compareExchange(view, 8, 1, 10) returns 0');
assert.sameValue(view[8], 0, 'The value of view[8] is 0');
view[8] = 0;
assert.sameValue(Atomics.compareExchange(view, 8, 0, -5), 0,
'Atomics.compareExchange(view, 8, 0, -5) returns 0');
control[0] = -5;
assert.sameValue(view[8], control[0], 'The value of view[8] equals the value of `control[0]` (-5)');
view[3] = -5;
control[0] = -5;
assert.sameValue(Atomics.compareExchange(view, 3, -5, 0), control[0],
'Atomics.compareExchange(view, 3, -5, 0) returns the value of `control[0]` (-5)');
assert.sameValue(view[3], 0, 'The value of view[3] is 0');
control[0] = 12345;
view[3] = 12345;
assert.sameValue(Atomics.compareExchange(view, 3, 12345, 0), control[0],
'Atomics.compareExchange(view, 3, 12345, 0) returns the value of `control[0]` (12345)');
assert.sameValue(view[3], 0, 'The value of view[3] is 0');
control[0] = 123456789;
view[3] = 123456789;
assert.sameValue(Atomics.compareExchange(view, 3, 123456789, 0), control[0],
'Atomics.compareExchange(view, 3, 123456789, 0) returns the value of `control[0]` (123456789)');
assert.sameValue(view[3], 0, 'The value of view[3] is 0');
// In-bounds boundary cases for indexing
testWithAtomicsInBoundsIndices(function(IdxGen) {
let Idx = IdxGen(view);
view.fill(0);
// Atomics.store() computes an index from Idx in the same way as other
// Atomics operations, not quite like view[Idx].
Atomics.store(view, Idx, 37);
assert.sameValue(
Atomics.compareExchange(view, Idx, 37, 0),
37,
'Atomics.compareExchange(view, Idx, 37, 0) returns 37'
);
});
}, views);
reportCompare(0, 0);
|
