1 files changed, 74 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Atomics/waitAsync/no-spurious-wakeup-on-compareExchange.js b/js/src/tests/test262/built-ins/Atomics/waitAsync/no-spurious-wakeup-on-compareExchange.js
new file mode 100644
index 0000000000..3802faddc4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/waitAsync/no-spurious-wakeup-on-compareExchange.js
@@ -0,0 +1,74 @@
+// |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 compareExchange 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.compareExchange(i32a, 0, 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);