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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.
67 lines
2.1 KiB
JavaScript
67 lines
2.1 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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Default to +Infinity when missing 'count' argument to Atomics.notify
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info: |
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Atomics.notify( typedArray, index, count )
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...
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3. If count is undefined, let c be +∞.
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...
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includes: [atomicsHelper.js]
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features: [Atomics, SharedArrayBuffer, TypedArray]
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---*/
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const RUNNING = 0; // Index to notify agent has started.
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const WAIT_INDEX = 1; // Index all agents are waiting on.
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const BUFFER_SIZE = 2;
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const NUMAGENT = 4; // Total number of agents started
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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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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 and then exit the agent.
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var name = String.fromCharCode(0x41 + ${i}); // "A", "B", "C", or "D"
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$262.agent.report(name + " " + 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 * BUFFER_SIZE)
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);
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$262.agent.safeBroadcast(i32a);
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$262.agent.waitUntil(i32a, RUNNING, NUMAGENT);
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// An agent may have been interrupted between reporting its initial report
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// and the `Atomics.wait` call. Try to yield control to ensure the agent
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// actually started to wait.
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$262.agent.tryYield();
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assert.sameValue(Atomics.notify(i32a, WAIT_INDEX /*, count missing */), NUMAGENT,
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'Atomics.notify(i32a, WAIT_INDEX /*, count missing */) returns the value of `NUMAGENT`');
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const reports = [];
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for (var i = 0; i < NUMAGENT; i++) {
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reports.push($262.agent.getReport());
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}
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reports.sort();
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assert.sameValue(reports[0], 'A ok', 'The value of reports[0] is "A ok"');
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assert.sameValue(reports[1], 'B ok', 'The value of reports[1] is "B ok"');
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assert.sameValue(reports[2], 'C ok', 'The value of reports[2] is "C ok"');
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assert.sameValue(reports[3], 'D ok', 'The value of reports[3] is "D ok"');
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