Function listOnTimeout

lib/internal/timers.js:546–643

(list, now)

  }

  function listOnTimeout(list, now) {
    const msecs = list.msecs;

    debug('timeout callback %d', msecs);

    let ranAtLeastOneTimer = false;
    let timer;
    while ((timer = L.peek(list)) != null) {
      const diff = now - timer._idleStart;

      // Check if this loop iteration is too early for the next timer.
      // This happens if there are more timers scheduled for later in the list.
      if (diff < msecs) {
        list.expiry = MathMax(timer._idleStart + msecs, now + 1);
        list.id = timerListId++;
        timerListQueue.percolateDown(1);
        debug('%d list wait because diff is %d', msecs, diff);
        return;
      }

      if (ranAtLeastOneTimer)
        runNextTicks();
      else
        ranAtLeastOneTimer = true;

      // The actual logic for when a timeout happens.
      L.remove(timer);

      const asyncId = timer[async_id_symbol];

      if (!timer._onTimeout) {
        if (!timer._destroyed) {
          timer._destroyed = true;

          if (timer[kHasPrimitive])
            delete knownTimersById[asyncId];

          if (timer[kRefed])
            timeoutInfo[0]--;

          emitDestroy(asyncId);
        }
        continue;
      }

      const priorContextFrame =
        AsyncContextFrame.exchange(timer[async_context_frame]);

      emitBefore(asyncId, timer[trigger_async_id_symbol], timer);

      let start;
      if (timer._repeat) {
        // We need to use the binding as the receiver for fast API calls.
        start = binding.getLibuvNow();
      }

      try {
        const args = timer._timerArgs;