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// META: title=Web Locks API: Lock held until callback result resolves
// META: script=resources/helpers.js
// META: global=window,dedicatedworker,sharedworker,serviceworker
'use strict';
// For uncaught rejections.
setup({allow_uncaught_exception: true});
function snooze(t, ms) { return new Promise(r => t.step_timeout(r, ms)); }
promise_test(async t => {
const res = uniqueName(t);
const p = navigator.locks.request(res, lock => 123);
assert_equals(Promise.resolve(p), p, 'request() result is a Promise');
assert_equals(await p, 123, 'promise resolves to the returned value');
}, 'callback\'s result is promisified if not async');
promise_test(async t => {
const res = uniqueName(t);
// Resolved when the lock is granted.
let granted;
const lock_granted_promise = new Promise(r => { granted = r; });
// Lock is held until this is resolved.
let resolve;
const lock_release_promise = new Promise(r => { resolve = r; });
const order = [];
navigator.locks.request(res, lock => {
granted(lock);
return lock_release_promise;
});
await lock_granted_promise;
await Promise.all([
snooze(t, 50).then(() => {
order.push('1st lock released');
resolve();
}),
navigator.locks.request(res, () => {
order.push('2nd lock granted');
})
]);
assert_array_equals(order, ['1st lock released', '2nd lock granted']);
}, 'lock is held until callback\'s returned promise resolves');
promise_test(async t => {
const res = uniqueName(t);
// Resolved when the lock is granted.
let granted;
const lock_granted_promise = new Promise(r => { granted = r; });
// Lock is held until this is rejected.
let reject;
const lock_release_promise = new Promise((_, r) => { reject = r; });
const order = [];
navigator.locks.request(res, lock => {
granted(lock);
return lock_release_promise;
});
await lock_granted_promise;
await Promise.all([
snooze(t, 50).then(() => {
order.push('reject');
reject(new Error('this uncaught rejection is expected'));
}),
navigator.locks.request(res, () => {
order.push('2nd lock granted');
})
]);
assert_array_equals(order, ['reject', '2nd lock granted']);
}, 'lock is held until callback\'s returned promise rejects');
promise_test(async t => {
const res = uniqueName(t);
let callback_called = false;
await navigator.locks.request(res, async lock => {
await navigator.locks.request(res, {ifAvailable: true}, lock => {
callback_called = true;
assert_equals(lock, null, 'lock request should fail if held');
});
});
assert_true(callback_called, 'callback should have executed');
}, 'held lock prevents the same client from acquiring it');
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