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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.broadcast(i32a.buffer);
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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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