JSTests/test262/test/built-ins/Atomics/wait/no-spurious-wakeup.js

// Copyright (C) 2017 Mozilla Corporation.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-atomics.wait
description: >
  Test that Atomics.wait actually waits and does not spuriously wake
  up when the memory value is changed.
includes: [atomicsHelper.js]
---*/

$262.agent.start(
`
$262.agent.receiveBroadcast(function (sab, id) {
  var ia = new Int32Array(sab);
  var then = Date.now();
  Atomics.wait(ia, 0, 0);
  var diff = Date.now() - then;        // Should be about 1000 ms but can be more
  $262.agent.report(diff);
  $262.agent.leaving();
})
`);

var ia = new Int32Array(new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT));

$262.agent.broadcast(ia.buffer);
$262.agent.sleep(500);                // Give the agent a chance to wait
Atomics.store(ia, 0, 1);              // Change the value, should not wake the agent
$262.agent.sleep(500);                // Wait some more so that we can tell
Atomics.wake(ia, 0);                  // Really wake it up
assert.sameValue((getReport()|0) >= 1000 - $ATOMICS_MAX_TIME_EPSILON, true);

function getReport() {
    var r;
    while ((r = $262.agent.getReport()) == null)
        $262.agent.sleep(100);
    return r;
}