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<!DOCTYPE html>
<meta charset=utf-8>
<title>Web Locks API: Workers</title>
<link rel=help href="https://w3c.github.io/web-locks/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/helpers.js"></script>
<script>
'use strict';
promise_test(async t => {
assert_implements(navigator.locks);
const worker = new Worker('resources/worker.js');
t.add_cleanup(() => { worker.terminate(); });
const res = 'shared resource 1';
const lock_id = (await postToWorkerAndWait(
worker, {op: 'request', name: res, mode: 'shared'})).lock_id;
await navigator.locks.request(res, {mode: 'shared'}, async lock => {
await postToWorkerAndWait(worker, {op: 'release', lock_id});
});
}, 'Window and Worker - shared mode');
promise_test(async t => {
assert_implements(navigator.locks);
const worker = new Worker('resources/worker.js');
t.add_cleanup(() => { worker.terminate(); });
const res = 'exclusive resource 1';
// worker acquires the lock.
const lock_id = (await postToWorkerAndWait(
worker, {op: 'request', name: res})).lock_id;
// This request should be blocked.
let lock_granted = false;
const blocked = navigator.locks.request(
res, lock => { lock_granted = true; });
// Verify we can't get it.
let available = undefined;
await navigator.locks.request(
res, {ifAvailable: true}, lock => { available = lock !== null; });
assert_false(available);
assert_false(lock_granted);
// Ask the worker to release it.
await postToWorkerAndWait(worker, {op: 'release', lock_id});
// Now we've got it.
const lock2 = await blocked;
assert_true(lock_granted);
}, 'Window and Worker - exclusive mode');
promise_test(async t => {
assert_implements(navigator.locks);
const worker1 = new Worker('resources/worker.js');
const worker2 = new Worker('resources/worker.js');
t.add_cleanup(() => { worker1.terminate(); worker2.terminate(); });
const res = 'exclusive resource 2';
// worker1 acquires the lock.
const lock_id = (await postToWorkerAndWait(
worker1, {op: 'request', name: res})).lock_id;
// This request should be blocked.
let lock_granted = false;
const blocked = postToWorkerAndWait(
worker2, {op: 'request', name: res});
blocked.then(f => { lock_granted = true; });
// Verify worker2 can't get it.
assert_true((await postToWorkerAndWait(worker2, {
op: 'request', name: res, ifAvailable: true
})).failed, 'Lock request should have failed');
assert_false(lock_granted);
// Ask worker1 to release it.
await postToWorkerAndWait(worker1, {op: 'release', lock_id});
// Now worker2 can get it.
const lock = await blocked;
assert_true(lock_granted);
}, 'Worker and Worker - exclusive mode');
promise_test(async t => {
assert_implements(navigator.locks);
const worker = new Worker('resources/worker.js');
const res = 'exclusive resource 3';
// Worker acquires the lock.
await postToWorkerAndWait(worker, {op: 'request', name: res});
// This request should be blocked.
let lock_granted = false;
const blocked = navigator.locks.request(
res, lock => { lock_granted = true; });
// Verify we can't get it.
let available = undefined;
await navigator.locks.request(
res, {ifAvailable: true}, lock => { available = lock !== null; });
assert_false(available);
assert_false(lock_granted);
// Implicitly release it by terminating the worker.
worker.terminate();
// Now we've got it.
const lock = await blocked;
assert_true(lock_granted);
}, 'Terminated Worker - exclusive mode');
</script>
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