C++ Timeout::Release方法代码示例

nsresult
TimeoutManager::Timeouts::ResetTimersForThrottleReduction(int32_t aPreviousThrottleDelayMS,
                                                          int32_t aMinTimeoutValueMS,
                                                          SortBy aSortBy,
                                                          nsIEventTarget* aQueue)
{
  TimeStamp now = TimeStamp::Now();

  // If insertion point is non-null, we're in the middle of firing timers and
  // the timers we're planning to fire all come before insertion point;
  // insertion point itself is a dummy timeout with an When() that may be
  // semi-bogus.  In that case, we don't need to do anything with insertion
  // point or anything before it, so should start at the timer after insertion
  // point, if there is one.
  // Otherwise, start at the beginning of the list.
  for (Timeout* timeout = InsertionPoint() ?
         InsertionPoint()->getNext() : GetFirst();
       timeout; ) {
    // It's important that this check be <= so that we guarantee that
    // taking std::max with |now| won't make a quantity equal to
    // timeout->When() below.
    if (timeout->When() <= now) {
      timeout = timeout->getNext();
      continue;
    }

    if (timeout->When() - now >
        TimeDuration::FromMilliseconds(aPreviousThrottleDelayMS)) {
      // No need to loop further.  Timeouts are sorted in When() order
      // and the ones after this point were all set up for at least
      // gMinBackgroundTimeoutValue ms and hence were not clamped.
      break;
    }

    // We reduced our throttled delay. Re-init the timer appropriately.
    // Compute the interval the timer should have had if it had not been set in a
    // background window
    TimeDuration interval =
      TimeDuration::FromMilliseconds(std::max(timeout->mInterval,
                                            uint32_t(aMinTimeoutValueMS)));
    uint32_t oldIntervalMillisecs = 0;
    timeout->mTimer->GetDelay(&oldIntervalMillisecs);
    TimeDuration oldInterval = TimeDuration::FromMilliseconds(oldIntervalMillisecs);
    if (oldInterval > interval) {
      // unclamp
      TimeStamp firingTime =
        std::max(timeout->When() - oldInterval + interval, now);

      NS_ASSERTION(firingTime < timeout->When(),
                   "Our firing time should strictly decrease!");

      TimeDuration delay = firingTime - now;
      timeout->SetWhenOrTimeRemaining(now, delay);
      MOZ_DIAGNOSTIC_ASSERT(timeout->When() == firingTime);

      // Since we reset When() we need to move |timeout| to the right
      // place in the list so that it remains sorted by When().

      // Get the pointer to the next timeout now, before we move the
      // current timeout in the list.
      Timeout* nextTimeout = timeout->getNext();

      // It is safe to remove and re-insert because When() is now
      // strictly smaller than it used to be, so we know we'll insert
      // |timeout| before nextTimeout.
      NS_ASSERTION(!nextTimeout ||
                   timeout->When() < nextTimeout->When(), "How did that happen?");
      timeout->remove();
      // Insert() will addref |timeout| and reset mFiringDepth.  Make sure to
      // undo that after calling it.
      uint32_t firingDepth = timeout->mFiringDepth;
      Insert(timeout, aSortBy);
      timeout->mFiringDepth = firingDepth;
      timeout->Release();

      nsresult rv = timeout->InitTimer(aQueue, delay.ToMilliseconds());

      if (NS_FAILED(rv)) {
        NS_WARNING("Error resetting non background timer for DOM timeout!");
        return rv;
      }

      timeout = nextTimeout;
    } else {
      timeout = timeout->getNext();
    }
  }

  return NS_OK;
}

//.........这里部分代码省略.........
        continue;
      }

      if (mWindow.IsSuspended()) {
        // Some timer did suspend us. Make sure the
        // rest of the timers get executed later.
        timeout->mFiringDepth = 0;
        continue;
      }

      // The timeout is on the list to run at this depth, go ahead and
      // process it.

      // Get the script context (a strong ref to prevent it going away)
      // for this timeout and ensure the script language is enabled.
      nsCOMPtr<nsIScriptContext> scx = mWindow.GetContextInternal();

      if (!scx) {
        // No context means this window was closed or never properly
        // initialized for this language.
        continue;
      }

      // This timeout is good to run
      bool timeout_was_cleared = mWindow.RunTimeoutHandler(timeout, scx);

      if (timeout_was_cleared) {
        // Make sure the iterator isn't holding any Timeout objects alive.
        runIter.Clear();

        // The running timeout's window was cleared, this means that
        // ClearAllTimeouts() was called from a *nested* call, possibly
        // through a timeout that fired while a modal (to this window)
        // dialog was open or through other non-obvious paths.
        // Note that if the last expired timeout corresponding to each list
        // is null, then we should expect a refcount of two, since the
        // dummy timeout for this queue was never injected into it, and the
        // corresponding timeoutExtraRef variable hasn't been cleared yet.
        if (last_expired_timeout_is_normal) {
          MOZ_ASSERT(dummy_normal_timeout->HasRefCnt(1), "dummy_normal_timeout may leak");
          MOZ_ASSERT(dummy_tracking_timeout->HasRefCnt(2), "dummy_tracking_timeout may leak");
          Unused << timeoutExtraRef1.forget().take();
        } else {
          MOZ_ASSERT(dummy_normal_timeout->HasRefCnt(2), "dummy_normal_timeout may leak");
          MOZ_ASSERT(dummy_tracking_timeout->HasRefCnt(1), "dummy_tracking_timeout may leak");
          Unused << timeoutExtraRef2.forget().take();
        }

        mNormalTimeouts.SetInsertionPoint(last_normal_insertion_point);
        mTrackingTimeouts.SetInsertionPoint(last_tracking_insertion_point);

        return;
      }

      // If we have a regular interval timer, we re-schedule the
      // timeout, accounting for clock drift.
      bool needsReinsertion = RescheduleTimeout(timeout, now, !aTimeout);

      // Running a timeout can cause another timeout to be deleted, so
      // we need to reset the pointer to the following timeout.
      runIter.UpdateIterator();

      timeout->remove();

      if (needsReinsertion) {
        // Insert interval timeout onto the corresponding list sorted in
        // deadline order. AddRefs timeout.
        if (runIter.PickedTrackingIter()) {
          mTrackingTimeouts.Insert(timeout,
                                   mWindow.IsFrozen() ? Timeouts::SortBy::TimeRemaining
                                                      : Timeouts::SortBy::TimeWhen);
        } else {
          mNormalTimeouts.Insert(timeout,
                                 mWindow.IsFrozen() ? Timeouts::SortBy::TimeRemaining
                                                    : Timeouts::SortBy::TimeWhen);
        }
      }

      // Release the timeout struct since it's possibly out of the list
      timeout->Release();
    }
  }

  // Take the dummy timeout off the head of the list
  if (dummy_normal_timeout->isInList()) {
    dummy_normal_timeout->remove();
  }
  timeoutExtraRef1 = nullptr;
  MOZ_ASSERT(dummy_normal_timeout->HasRefCnt(1), "dummy_normal_timeout may leak");
  if (dummy_tracking_timeout->isInList()) {
    dummy_tracking_timeout->remove();
  }
  timeoutExtraRef2 = nullptr;
  MOZ_ASSERT(dummy_tracking_timeout->HasRefCnt(1), "dummy_tracking_timeout may leak");

  mNormalTimeouts.SetInsertionPoint(last_normal_insertion_point);
  mTrackingTimeouts.SetInsertionPoint(last_tracking_insertion_point);

  MaybeApplyBackPressure();
}