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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 worklet1 = await sharedStorage.createWorklet('resources/simple-module.js');
let worklet2 = await sharedStorage.createWorklet('resources/simple-module.js');
const ancestor_key1 = token();
let url1_0 = generateURL("/shared-storage/resources/frame0.html",
[ancestor_key1]);
let url1_1 = generateURL("/shared-storage/resources/frame1.html",
[ancestor_key1]);
const ancestor_key2 = token();
let url2_0 = generateURL("/shared-storage/resources/frame0.html",
[ancestor_key2]);
let url2_1 = generateURL("/shared-storage/resources/frame1.html",
[ancestor_key2]);
// Two `selectURL()`s run in parallel. Each performs the following steps:
// 1. Acquires the lock.
// 2. Reads the current value of the given key.
// 3. Waits for 100ms.
// 4. Increments the value.
// 5. Releases the lock.
//
// Expected behavior: After both operations finish, the value of the given key
// should be 2.
//
// This demonstrates that the lock is effective, preventing the
// "get and increment" operations from interleaving. If the lock were not
// used, both worklets would likely read 0 and set the value to 1.
let select_url_result1 = await worklet1.selectURL(
"get-wait-increment-within-lock", [{url: url1_0}, {url: url1_1}],
{data: {'key': 'key'}, resolveToConfig: true});
let select_url_result2 = await worklet2.selectURL(
"get-wait-increment-within-lock", [{url: url2_0}, {url: url2_1}],
{data: {'key': 'key'}, resolveToConfig: true});
attachFencedFrame(select_url_result1, 'opaque-ads');
const result1 = await nextValueFromServer(ancestor_key1);
assert_equals(result1, "frame1_loaded");
attachFencedFrame(select_url_result2, 'opaque-ads');
const result2 = await nextValueFromServer(ancestor_key2);
assert_equals(result2, "frame1_loaded");
await verifyKeyValueForOrigin('key', '2', location.origin);
await deleteKeyForOrigin('key', location.origin);
}, 'Basic test for Web Locks API in the shared storage worklet');
</script>
</body>
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