mirror of https://github.com/tc39/test262.git
66 lines
2.2 KiB
JavaScript
66 lines
2.2 KiB
JavaScript
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// Copyright (C) 2018 Rick Waldron. 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, testBigIntTypedArray.js]
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features: [ArrayBuffer, Atomics, BigInt, computed-property-names, DataView, for-of, let, SharedArrayBuffer, TypedArray]
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---*/
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var sab = new SharedArrayBuffer(1024);
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var ab = new ArrayBuffer(16);
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testWithBigIntTypedArrayConstructors(function(TA) {
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// Make it interesting - use non-zero byteOffsets and non-zero indexes.
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var view = new TA(sab, 32, 20);
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var 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(Atomics.compareExchange(view, 8, 0, 10), 0);
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assert.sameValue(view[8], 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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"Does not perform the exchange");
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assert.sameValue(view[8], 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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"Performs the exchange, coercing the value being stored");
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control[0] = -5;
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assert.sameValue(view[8], control[0]);
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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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"Performs the exchange, coercing the value being tested");
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assert.sameValue(view[3], 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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"Performs the exchange, chopping the value being tested");
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assert.sameValue(view[3], 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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"Performs the exchange, chopping the value being tested");
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assert.sameValue(view[3], 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(Atomics.compareExchange(view, Idx, 37, 0), 37);
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});
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});
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