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75 lines
2.6 KiB
JavaScript
75 lines
2.6 KiB
JavaScript
// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-atomics.compareexchange
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description: Test Atomics.compareExchange on arrays that allow atomic operations.
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includes: [testAtomics.js, testTypedArray.js]
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features: [ArrayBuffer, Atomics, DataView, SharedArrayBuffer, Symbol, TypedArray]
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---*/
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const sab = new SharedArrayBuffer(1024);
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const ab = new ArrayBuffer(16);
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const views = nonClampedIntArrayConstructors.slice();
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testWithTypedArrayConstructors(function(TA) {
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// Make it interesting - use non-zero byteOffsets and non-zero indexes.
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const view = new TA(sab, 32, 20);
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const control = new TA(ab, 0, 2);
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// Performs the exchange
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view[8] = 0;
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assert.sameValue(
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Atomics.compareExchange(view, 8, 0, 10),
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0,
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'Atomics.compareExchange(view, 8, 0, 10) returns 0'
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);
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assert.sameValue(view[8], 10, 'The value of view[8] is 10');
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view[8] = 0;
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assert.sameValue(Atomics.compareExchange(view, 8, 1, 10), 0,
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'Atomics.compareExchange(view, 8, 1, 10) returns 0');
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assert.sameValue(view[8], 0, 'The value of view[8] is 0');
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view[8] = 0;
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assert.sameValue(Atomics.compareExchange(view, 8, 0, -5), 0,
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'Atomics.compareExchange(view, 8, 0, -5) returns 0');
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control[0] = -5;
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assert.sameValue(view[8], control[0], 'The value of view[8] equals the value of `control[0]` (-5)');
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view[3] = -5;
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control[0] = -5;
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assert.sameValue(Atomics.compareExchange(view, 3, -5, 0), control[0],
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'Atomics.compareExchange(view, 3, -5, 0) returns the value of `control[0]` (-5)');
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assert.sameValue(view[3], 0, 'The value of view[3] is 0');
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control[0] = 12345;
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view[3] = 12345;
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assert.sameValue(Atomics.compareExchange(view, 3, 12345, 0), control[0],
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'Atomics.compareExchange(view, 3, 12345, 0) returns the value of `control[0]` (12345)');
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assert.sameValue(view[3], 0, 'The value of view[3] is 0');
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control[0] = 123456789;
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view[3] = 123456789;
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assert.sameValue(Atomics.compareExchange(view, 3, 123456789, 0), control[0],
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'Atomics.compareExchange(view, 3, 123456789, 0) returns the value of `control[0]` (123456789)');
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assert.sameValue(view[3], 0, 'The value of view[3] is 0');
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// In-bounds boundary cases for indexing
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testWithAtomicsInBoundsIndices(function(IdxGen) {
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let Idx = IdxGen(view);
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view.fill(0);
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// Atomics.store() computes an index from Idx in the same way as other
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// Atomics operations, not quite like view[Idx].
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Atomics.store(view, Idx, 37);
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assert.sameValue(
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Atomics.compareExchange(view, Idx, 37, 0),
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37,
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'Atomics.compareExchange(view, Idx, 37, 0) returns 37'
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);
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});
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}, views);
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