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// META: title=Web Locks API: navigator.locks.query method
// META: script=resources/helpers.js
'use strict';
// Returns an array of the modes for the locks with matching name.
function modes(list, name) {
return list.filter(item => item.name === name).map(item => item.mode);
}
// Returns an array of the clientIds for the locks with matching name.
function clients(list, name) {
return list.filter(item => item.name === name).map(item => item.clientId);
}
promise_test(async t => {
const res = uniqueName(t);
await navigator.locks.request(res, async lock1 => {
// Attempt to request this again - should be blocked.
let lock2_acquired = false;
navigator.locks.request(res, lock2 => { lock2_acquired = true; });
// Verify that it was blocked.
await navigator.locks.request(res, {ifAvailable: true}, async lock3 => {
assert_false(lock2_acquired, 'second request should be blocked');
assert_equals(lock3, null, 'third request should have failed');
const state = await navigator.locks.query();
assert_own_property(state, 'pending', 'State has `pending` property');
assert_true(Array.isArray(state.pending),
'State `pending` property is an array');
const pending_info = state.pending[0];
assert_own_property(pending_info, 'name',
'Pending info dictionary has `name` property');
assert_own_property(pending_info, 'mode',
'Pending info dictionary has `mode` property');
assert_own_property(pending_info, 'clientId',
'Pending info dictionary has `clientId` property');
assert_own_property(state, 'held', 'State has `held` property');
assert_true(Array.isArray(state.held),
'State `held` property is an array');
const held_info = state.held[0];
assert_own_property(held_info, 'name',
'Held info dictionary has `name` property');
assert_own_property(held_info, 'mode',
'Held info dictionary has `mode` property');
assert_own_property(held_info, 'clientId',
'Held info dictionary has `clientId` property');
});
});
}, 'query() returns dictionaries with expected properties');
promise_test(async t => {
const res = uniqueName(t);
await navigator.locks.request(res, async lock1 => {
const state = await navigator.locks.query();
assert_array_equals(modes(state.held, res), ['exclusive'],
'Held lock should appear once');
});
await navigator.locks.request(res, {mode: 'shared'}, async lock1 => {
const state = await navigator.locks.query();
assert_array_equals(modes(state.held, res), ['shared'],
'Held lock should appear once');
});
}, 'query() reports individual held locks');
promise_test(async t => {
const res1 = uniqueName(t);
const res2 = uniqueName(t);
await navigator.locks.request(res1, async lock1 => {
await navigator.locks.request(res2, {mode: 'shared'}, async lock2 => {
const state = await navigator.locks.query();
assert_array_equals(modes(state.held, res1), ['exclusive'],
'Held lock should appear once');
assert_array_equals(modes(state.held, res2), ['shared'],
'Held lock should appear once');
});
});
}, 'query() reports multiple held locks');
promise_test(async t => {
const res = uniqueName(t);
await navigator.locks.request(res, async lock1 => {
// Attempt to request this again - should be blocked.
let lock2_acquired = false;
navigator.locks.request(res, lock2 => { lock2_acquired = true; });
// Verify that it was blocked.
await navigator.locks.request(res, {ifAvailable: true}, async lock3 => {
assert_false(lock2_acquired, 'second request should be blocked');
assert_equals(lock3, null, 'third request should have failed');
const state = await navigator.locks.query();
assert_array_equals(modes(state.pending, res), ['exclusive'],
'Pending lock should appear once');
assert_array_equals(modes(state.held, res), ['exclusive'],
'Held lock should appear once');
});
});
}, 'query() reports pending and held locks');
promise_test(async t => {
const res = uniqueName(t);
await navigator.locks.request(res, {mode: 'shared'}, async lock1 => {
await navigator.locks.request(res, {mode: 'shared'}, async lock2 => {
const state = await navigator.locks.query();
assert_array_equals(modes(state.held, res), ['shared', 'shared'],
'Held lock should appear twice');
});
});
}, 'query() reports held shared locks with appropriate count');
promise_test(async t => {
const res = uniqueName(t);
await navigator.locks.request(res, async lock1 => {
let lock2_acquired = false, lock3_acquired = false;
navigator.locks.request(res, {mode: 'shared'},
lock2 => { lock2_acquired = true; });
navigator.locks.request(res, {mode: 'shared'},
lock3 => { lock3_acquired = true; });
await navigator.locks.request(res, {ifAvailable: true}, async lock4 => {
assert_equals(lock4, null, 'lock should not be available');
assert_false(lock2_acquired, 'second attempt should be blocked');
assert_false(lock3_acquired, 'third attempt should be blocked');
const state = await navigator.locks.query();
assert_array_equals(modes(state.held, res), ['exclusive'],
'Held lock should appear once');
assert_array_equals(modes(state.pending, res), ['shared', 'shared'],
'Pending lock should appear twice');
});
});
}, 'query() reports pending shared locks with appropriate count');
promise_test(async t => {
const res1 = uniqueName(t);
const res2 = uniqueName(t);
await navigator.locks.request(res1, async lock1 => {
await navigator.locks.request(res2, async lock2 => {
const state = await navigator.locks.query();
const res1_clients = clients(state.held, res1);
const res2_clients = clients(state.held, res2);
assert_equals(res1_clients.length, 1, 'Each lock should have one holder');
assert_equals(res2_clients.length, 1, 'Each lock should have one holder');
assert_array_equals(res1_clients, res2_clients,
'Both locks should have same clientId');
});
});
}, 'query() reports the same clientId for held locks from the same context');
promise_test(async t => {
const res = uniqueName(t);
const worker = new Worker('resources/worker.js');
t.add_cleanup(() => { worker.terminate(); });
await postToWorkerAndWait(
worker, {op: 'request', name: res, mode: 'shared'});
await navigator.locks.request(res, {mode: 'shared'}, async lock => {
const state = await navigator.locks.query();
const res_clients = clients(state.held, res);
assert_equals(res_clients.length, 2, 'Clients should have same resource');
assert_not_equals(res_clients[0], res_clients[1],
'Clients should have different ids');
});
}, 'query() reports different ids for held locks from different contexts');
promise_test(async t => {
const res1 = uniqueName(t);
const res2 = uniqueName(t);
const worker = new Worker('resources/worker.js');
t.add_cleanup(() => { worker.terminate(); });
// Acquire 1 in the worker.
await postToWorkerAndWait(worker, {op: 'request', name: res1})
// Acquire 2 here.
await new Promise(resolve => {
navigator.locks.request(res2, lock => {
resolve();
return new Promise(() => {}); // Never released.
});
});
// Request 2 in the worker.
postToWorkerAndWait(worker, {op: 'request', name: res2});
assert_true((await postToWorkerAndWait(worker, {
op: 'request', name: res2, ifAvailable: true
})).failed, 'Lock request should have failed');
// Request 1 here.
navigator.locks.request(
res1, t.unreached_func('Lock should not be acquired'));
// Verify that we're seeing a deadlock.
const state = await navigator.locks.query();
const res1_held_clients = clients(state.held, res1);
const res2_held_clients = clients(state.held, res2);
const res1_pending_clients = clients(state.pending, res1);
const res2_pending_clients = clients(state.pending, res2);
assert_equals(res1_held_clients.length, 1);
assert_equals(res2_held_clients.length, 1);
assert_equals(res1_pending_clients.length, 1);
assert_equals(res2_pending_clients.length, 1);
assert_equals(res1_held_clients[0], res2_pending_clients[0]);
assert_equals(res2_held_clients[0], res1_pending_clients[0]);
}, 'query() can observe a deadlock');
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