test_watchdog_hibernate.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/. */

async function testBody() {

  setWatchdogEnabled(true);

  // It's unlikely that we've ever hibernated at this point, but the timestamps

  // default to 0, so this should always be true.

  var now = Date.now() * 1000;

  var startHibernation = Cu.getWatchdogTimestamp("WatchdogHibernateStart");

  var stopHibernation = Cu.getWatchdogTimestamp("WatchdogHibernateStop");

  do_log_info("Pre-hibernation statistics:");

  do_log_info("now: " + now / 1000000);

  do_log_info("startHibernation: " + startHibernation / 1000000);

  do_log_info("stopHibernation: " + stopHibernation / 1000000);

  Assert.less(startHibernation, now, "startHibernation ok");

  Assert.less(stopHibernation, now, "stopHibernation ok");

  // When the watchdog runs, it hibernates if there's been no activity for the

  // last 2 seconds, otherwise it sleeps for 1 second. As such, given perfect

  // scheduling, we should never have more than 3 seconds of inactivity without

  // hibernating. To add some padding for automation, we mandate that hibernation

  // must begin between 2 and 5 seconds from now.

  // Sleep for 10 seconds. Note: we don't use nsITimer here because then we may run

  // arbitrary (idle) events involving script before it fires.

  simulateNoScriptActivity(10);

  busyWait(1000); // Give the watchdog time to wake up on the condvar.

  var stateChange = Cu.getWatchdogTimestamp("ContextStateChange");

  startHibernation = Cu.getWatchdogTimestamp("WatchdogHibernateStart");

  stopHibernation = Cu.getWatchdogTimestamp("WatchdogHibernateStop");

  do_log_info("Post-hibernation statistics:");

  do_log_info("stateChange: " + stateChange / 1000000);

  do_log_info("startHibernation: " + startHibernation / 1000000);

  do_log_info("stopHibernation: " + stopHibernation / 1000000);

  // XPCOM timers, JS times, and PR_Now() are apparently not directly

  // comparable, as evidenced by certain seemingly-impossible timing values

  // that occasionally get logged in windows automation. We're really just

  // making sure this behavior is roughly as expected on the macro scale,

  // so we add a 1 second fuzz factor here.

  const FUZZ_FACTOR = 1 * 1000 * 1000;

  Assert.greater(stateChange, now + 10*1000*1000 - FUZZ_FACTOR, "stateChange ok");

  Assert.greater(startHibernation, now + 2*1000*1000 - FUZZ_FACTOR, "startHibernation ok");

  Assert.less(startHibernation, now + 5*1000*1000 + FUZZ_FACTOR, "startHibernation ok");

  Assert.greater(stopHibernation, now + 10*1000*1000 - FUZZ_FACTOR, "stopHibernation ok");