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e4883091b9
Migrating all tests to this API is necessary to prevent tests from hanging indefinitely when a SAB is sent to a worker but the code in the worker attempts to create a non-sharable TypedArray (something that is not Int32Array or BigInt64Array). When that scenario occurs, an exception is thrown and the agent worker can no longer communicate with any other threads that control the SAB. If the main thread happens to be spinning in the $262.agent.waitUntil() while loop, it will never meet its termination condition and the test will hang indefinitely. Because we've defined $262.agent.broadcast(SAB) in https://github.com/tc39/test262/blob/master/INTERPRETING.md, there are host implementations that assume compatibility, which must be maintained.
74 lines
2.0 KiB
JavaScript
74 lines
2.0 KiB
JavaScript
// Copyright (C) 2018 Amal Hussein. 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.notify
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description: >
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An undefined index arg should translate to 0
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info: |
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Atomics.notify( typedArray, index, count )
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2.Let i be ? ValidateAtomicAccess(typedArray, index).
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...
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2.Let accessIndex be ? ToIndex(requestIndex).
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9.If IsSharedArrayBuffer(buffer) is false, throw a TypeError exception.
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...
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3.If bufferData is a Data Block, return false
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If value is undefined, then
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Let index be 0.
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includes: [atomicsHelper.js]
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features: [Atomics, SharedArrayBuffer, TypedArray]
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---*/
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var WAIT_INDEX = 0;
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var RUNNING = 1;
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var NUMAGENT = 2;
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for (var i = 0; i < NUMAGENT; i++) {
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$262.agent.start(`
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$262.agent.receiveBroadcast(function(sab) {
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const i32a = new Int32Array(sab);
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// Notify main thread that the agent was started.
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Atomics.add(i32a, ${RUNNING}, 1);
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// Wait until restarted by main thread.
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var status = Atomics.wait(i32a, ${WAIT_INDEX}, 0);
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// Report wait status.
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$262.agent.report(status);
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$262.agent.leaving();
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});
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`);
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}
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const i32a = new Int32Array(
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new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 4)
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);
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$262.agent.safeBroadcast(i32a);
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// Wait until both agents started.
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$262.agent.waitUntil(i32a, RUNNING, NUMAGENT);
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// Try to yield control to ensure the agents actually started to wait.
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$262.agent.tryYield();
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// Notify at index 0, undefined => 0.
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var woken = 0;
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while ((woken = Atomics.notify(i32a, undefined, 1)) === 0) ;
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assert.sameValue(woken, 1, 'Atomics.notify(i32a, undefined, 1) returns 1');
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assert.sameValue($262.agent.getReport(), 'ok', '$262.agent.getReport() returns "ok"');
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// Notify again at index 0, default => 0.
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var woken = 0;
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while ((woken = Atomics.notify(i32a /*, default values used */)) === 0) ;
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assert.sameValue(woken, 1, 'Atomics.notify(i32a /*, default values used */) returns 1');
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assert.sameValue($262.agent.getReport(), 'ok', '$262.agent.getReport() returns "ok"');
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