1 files changed, 55 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Atomics/wait/no-spurious-wakeup-on-sub.js b/js/src/tests/test262/built-ins/Atomics/wait/no-spurious-wakeup-on-sub.js
new file mode 100644
index 0000000000..27a96c6216
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/wait/no-spurious-wakeup-on-sub.js
@@ -0,0 +1,55 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration('arm64-simulator'))) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics
+// Copyright (C) 2018 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.wait
+description: >
+  Waiter does not spuriously notify on index which is subject to Sub operation
+includes: [atomicsHelper.js]
+features: [Atomics, SharedArrayBuffer, TypedArray]
+---*/
+
+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(function(sab) {
+    const i32a = new Int32Array(sab);
+    Atomics.add(i32a, ${RUNNING}, 1);
+
+    const before = $262.agent.monotonicNow();
+    const unpark = Atomics.wait(i32a, 0, 0, ${TIMEOUT});
+    const duration = $262.agent.monotonicNow() - before;
+
+    $262.agent.report(duration);
+    $262.agent.report(unpark);
+    $262.agent.leaving();
+  });
+`);
+
+$262.agent.safeBroadcast(i32a);
+$262.agent.waitUntil(i32a, RUNNING, 1);
+
+// Try to yield control to ensure the agent actually started to wait.
+$262.agent.tryYield();
+
+Atomics.sub(i32a, 0, 1);
+
+const lapse = $262.agent.getReport();
+assert(
+  lapse >= TIMEOUT,
+  'The result of `(lapse >= TIMEOUT)` is true'
+);
+assert.sameValue(
+  $262.agent.getReport(),
+  'timed-out',
+  '$262.agent.getReport() returns "timed-out"'
+);
+assert.sameValue(Atomics.notify(i32a, 0), 0, 'Atomics.notify(i32a, 0) returns 0');
+
+reportCompare(0, 0);