mirror of https://github.com/tc39/test262.git
70 lines
2.0 KiB
JavaScript
70 lines
2.0 KiB
JavaScript
// Copyright (C) 2017 Mozilla Corporation. 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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Test that Atomics.notify notifies two waiters if that's what the count is.
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includes: [atomicsHelper.js]
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features: [Atomics, SharedArrayBuffer, TypedArray]
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---*/
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const WAIT_INDEX = 0; // Agents wait here
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const RUNNING = 1; // Accounting of live agents here
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const NOTIFYCOUNT = 2;
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const NUMAGENT = 3;
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const BUFFER_SIZE = 4;
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const TIMEOUT = $262.agent.timeouts.long;
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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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// Waiters that are not woken will time out eventually.
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$262.agent.report(Atomics.wait(i32a, ${WAIT_INDEX}, 0, ${TIMEOUT}));
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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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// Wait for agents to be running.
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$262.agent.waitUntil(i32a, RUNNING, NUMAGENT);
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// Try to yield control to ensure the agent actually started to wait.
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$262.agent.tryYield();
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// There's a slight risk we'll fail to notify the desired count, if the preceding
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// tryYield() took much longer than anticipated and workers have started timing
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// out.
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assert.sameValue(
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Atomics.notify(i32a, 0, NOTIFYCOUNT),
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NOTIFYCOUNT,
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'Atomics.notify(i32a, 0, NOTIFYCOUNT) returns the value of `NOTIFYCOUNT`'
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);
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// Try to sleep past the timeout.
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$262.agent.trySleep(TIMEOUT);
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// Collect and check results
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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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for (var i = 0; i < NOTIFYCOUNT; i++) {
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assert.sameValue(reports[i], 'ok', 'The value of reports[i] is "ok"');
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}
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for (var i = NOTIFYCOUNT; i < NUMAGENT; i++) {
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assert.sameValue(reports[i], 'timed-out', 'The value of reports[i] is "timed-out"');
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}
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