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Test Info: Warnings
- This test has a WPT meta file that expects 4 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /scheduler/tentative/yield/yield-priority-timers.any.html - WPT Dashboard Interop Dashboard
- /scheduler/tentative/yield/yield-priority-timers.any.worker.html - WPT Dashboard Interop Dashboard
'use strict';
// Queues a zero ms timer that yields 3 times using `yieldParams`, then posts 2
// more 0 ms timers.
//
// Returns {tasks, ids} where `tasks` is an array of promises associated with
// the timers and `ids` is an array of task ids appended to by the scheduled
// tasks.
function postTestTasks(yieldParams) {
const tasks = [];
const ids = [];
tasks.push(new Promise(resolve => {
setTimeout(async () => {
ids.push('t1');
for (let i = 1; i < 4; i++) {
await scheduler.yield(yieldParams);
ids.push('y' + i);
}
resolve();
});
}));
tasks.push(new Promise(resolve => {
setTimeout(() => { ids.push('t2'); resolve(); });
}));
tasks.push(new Promise(resolve => {
setTimeout(() => { ids.push('t3'); resolve(); });
}));
return {tasks, ids};
}
// Expected task orders for `postTestTasks` tasks.
const taskOrders = {
'user-blocking': 't1,y1,y2,y3,t2,t3',
'user-visible': 't1,y1,y2,y3,t2,t3',
'background': 't1,t2,t3,y1,y2,y3',
};
const priorityConfigs = [
{options: {}, expected: taskOrders['user-visible']},
{options: {priority: 'user-visible'}, expected: taskOrders['user-visible']},
{options: {priority: 'user-blocking'}, expected: taskOrders['user-blocking']},
{options: {priority: 'background'}, expected: taskOrders['background']},
];
const fixedPrioritySignals = {
'user-blocking': (new TaskController({priority: 'user-blocking'})).signal,
'user-visible': (new TaskController({priority: 'user-visible'})).signal,
'background': (new TaskController({priority: 'background'})).signal,
};
const signalConfigs = [
{
options: {signal: fixedPrioritySignals['user-visible']},
expected: taskOrders['user-visible']
},
{
options: {signal: fixedPrioritySignals['user-blocking']},
expected: taskOrders['user-blocking']
},
{
options: {signal: fixedPrioritySignals['background']},
expected: taskOrders['background']
},
];
promise_test(async t => {
for (const config of priorityConfigs) {
const {tasks, ids} = postTestTasks(config.options);
await Promise.all(tasks);
assert_equals(ids.join(), config.expected);
}
}, 'yield() with timer tasks (priority option)');
promise_test(async t => {
for (const config of signalConfigs) {
const {tasks, ids} = postTestTasks(config.options);
await Promise.all(tasks);
assert_equals(ids.join(), config.expected);
}
}, 'yield() with timer tasks (signal option)');
promise_test(async t => {
const {tasks, ids} = postTestTasks({priority: 'inherit'});
await Promise.all(tasks);
assert_equals(ids.join(), taskOrders['user-visible']);
}, 'yield() with timer tasks (inherit priority)');
promise_test(async t => {
const {tasks, ids} = postTestTasks({signal: 'inherit'});
await Promise.all(tasks);
assert_equals(ids.join(), taskOrders['user-visible']);
}, 'yield() with timer tasks (inherit signal)');