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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<script src="/shared-storage/resources/util.js"></script>
<script src="/fenced-frame/resources/utils.js"></script>
<body>
<script>
'use strict';
promise_test(async t => {
let worklet = await sharedStorage.createWorklet('resources/simple-module.js');
const ancestor_key = token();
let url0 = generateURL("/shared-storage/resources/frame0.html",
[ancestor_key]);
let url1 = generateURL("/shared-storage/resources/frame1.html",
[ancestor_key]);
// Invoke `selectURL()` to perform the following steps:
// 1. Acquires the lock.
// 2. Reads the current value at the given key.
// 3. Waits for 500ms.
// 4. Sets the shared storage value to the read value appended with the given letter.
// 5. Releases the lock.
//
// After 100ms, invoke `sharedStorage.append()` with the same lock and the
// same letter to append.
//
// Expected behavior: After both of them finish, the value at the given key
// should contain the letter repeated twice.
//
// This demonstrates that the `withLock` option is effective, preventing the
// `append()` method interfering with the "get and set" operation. If the lock
// were not used, the final value would likely be a single letter.
//
// Note: This test remains valid even if the `append()` call happens outside
// the critical section protected by the lock within the worklet. The test
// effectively demonstrates mutual exclusion as long as there's a reasonable
// chance for `append()` to occur while the worklet is still running.
let select_url_result = await worklet.selectURL(
"get-wait-set-within-lock",
[{url: url0}, {url: url1}],
{data: {'key': 'key',
'lock_name': 'lock1',
'append_letter': 'a'},
resolveToConfig: true});
// Busy wait for 100ms.
const startWaitTime = Date.now();
while (Date.now() - startWaitTime < 100) {}
sharedStorage.append('key', 'a', {withLock: 'lock1'});
attachFencedFrame(select_url_result, 'opaque-ads');
const result = await nextValueFromServer(ancestor_key);
assert_equals(result, "frame1_loaded");
await verifyKeyValueForOrigin('key', 'aa', location.origin);
await deleteKeyForOrigin('key', location.origin);
}, 'Test for withLock option in a Window context');
</script>
</body>
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