mirror of https://github.com/tc39/test262.git
72 lines
1.9 KiB
JavaScript
72 lines
1.9 KiB
JavaScript
// 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.exchange
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description: Test Atomics.exchange on arrays that allow atomic operations.
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includes: [testAtomics.js, testBigIntTypedArray.js]
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features: [ArrayBuffer, Atomics, BigInt, 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(BigInt64Array.BYTES_PER_ELEMENT * 2);
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testWithBigIntTypedArrayConstructors(function(TA) {
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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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view[8] = 0n;
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assert.sameValue(Atomics.exchange(view, 8, 10n), 0n, 'Atomics.exchange(view, 8, 10n) returns 0n');
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assert.sameValue(view[8], 10n, 'The value of view[8] is 10n');
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assert.sameValue(
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Atomics.exchange(view, 8, -5n),
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10n,
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'Atomics.exchange(view, 8, -5n) returns 10n'
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);
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control[0] = -5n;
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assert.sameValue(
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view[8],
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control[0],
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'The value of view[8] equals the value of `control[0]` (-5n)'
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);
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view[3] = -5n;
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control[0] = -5n;
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assert.sameValue(
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Atomics.exchange(view, 3, 0n),
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control[0],
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'Atomics.exchange(view, 3, 0n) returns the value of `control[0]` (-5n)'
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);
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control[0] = 12345n;
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view[3] = 12345n;
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assert.sameValue(
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Atomics.exchange(view, 3, 0n),
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control[0],
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'Atomics.exchange(view, 3, 0n) returns the value of `control[0]` (12345n)'
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);
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control[0] = 123456789n;
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view[3] = 123456789n;
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assert.sameValue(
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Atomics.exchange(view, 3, 0n),
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control[0],
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'Atomics.exchange(view, 3, 0n) returns the value of `control[0]` (123456789n)'
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);
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testWithAtomicsInBoundsIndices(function(IdxGen) {
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let Idx = IdxGen(view);
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view.fill(0n);
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Atomics.store(view, Idx, 37n);
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assert.sameValue(
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Atomics.exchange(view, Idx, 0n),
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37n,
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'Atomics.exchange(view, Idx, 0n) returns 37n'
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);
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});
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});
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