test_responsiveness.js

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/**

 * Test that we can measure non-zero event delays

*/

add_task(async () => {

  const entries = 10000;

  const interval = 1;

  const threads = [];

  const features = [];

  await Services.profiler.StartProfiler(entries, interval, features, threads);

  await functionA();

  const profile = await stopNowAndGetProfile();

  const [thread] = profile.threads;

  const { samples } = thread;

  const message = "eventDelay > 0 not found.";

  let SAMPLE_STACK_SLOT = thread.samples.schema.eventDelay;

  for (let i = 0; i < samples.data.length; i++) {

    if (samples.data[i][SAMPLE_STACK_SLOT] > 0) {

      Assert.ok(true, message);

      return;

  Assert.ok(false, message);

});

function doSyncWork(milliseconds) {

  const start = Date.now();

  while (true) {

    this.n = 0;

    for (let i = 0; i < 1e5; i++) {

      this.n += Math.random();

    if (Date.now() - start > milliseconds) {

      return;

async function functionA() {

  doSyncWork(100);

  return captureAtLeastOneJsSample();