Source code
Revision control
Copy as Markdown
Other Tools
// |reftest| skip async -- Atomics.waitAsync is not supported
// Copyright (C) 2020 Rick Waldron. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-atomics.waitasync
description: >
Waiter does not spuriously notify on index which is subject to Add operation
info: |
AddWaiter ( WL, waiterRecord )
5. Append waiterRecord as the last element of WL.[[Waiters]]
6. If waiterRecord.[[Timeout]] is finite, then in parallel,
a. Wait waiterRecord.[[Timeout]] milliseconds.
b. Perform TriggerTimeout(WL, waiterRecord).
TriggerTimeout( WL, waiterRecord )
3. If waiterRecord is in WL.[[Waiters]], then
a. Set waiterRecord.[[Result]] to "timed-out".
b. Perform RemoveWaiter(WL, waiterRecord).
c. Perform NotifyWaiter(WL, waiterRecord).
4. Perform LeaveCriticalSection(WL).
flags: [async]
includes: [atomicsHelper.js]
features: [Atomics.waitAsync, SharedArrayBuffer, TypedArray, Atomics, arrow-function, async-functions]
---*/
assert.sameValue(typeof Atomics.waitAsync, 'function', 'The value of `typeof Atomics.waitAsync` is "function"');
const RUNNING = 1;
const TIMEOUT = $262.agent.timeouts.small;
const i32a = new Int32Array(
new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 4)
);
$262.agent.start(`
$262.agent.receiveBroadcast(async (sab) => {
const i32a = new Int32Array(sab);
Atomics.add(i32a, ${RUNNING}, 1);
const before = $262.agent.monotonicNow();
const unpark = await Atomics.waitAsync(i32a, 0, 0, ${TIMEOUT}).value;
const duration = $262.agent.monotonicNow() - before;
$262.agent.report(duration);
$262.agent.report(unpark);
$262.agent.leaving();
});
`);
$262.agent.safeBroadcastAsync(i32a, RUNNING, 1).then(async (agentCount) => {
assert.sameValue(agentCount, 1, 'The value of `agentCount` is 1');
Atomics.add(i32a, 0, 1);
const lapse = await $262.agent.getReportAsync();
assert(
lapse >= TIMEOUT,
'The result of evaluating `(lapse >= TIMEOUT)` is true'
);
const result = await $262.agent.getReportAsync();
assert.sameValue(
result,
'timed-out',
'The value of `result` is "timed-out"'
);
assert.sameValue(Atomics.notify(i32a, 0), 0, 'Atomics.notify(new Int32Array(new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 4)), 0) must return 0');
}).then($DONE, $DONE);