调度

export function finishQueueingConcurrentUpdates(): void {
  const endIndex = concurrentQueuesIndex;
  concurrentQueuesIndex = 0;

  concurrentlyUpdatedLanes = NoLanes;

  let i = 0;
  while (i < endIndex) {
    const fiber: Fiber = concurrentQueues[i];
    concurrentQueues[i++] = null;
    const queue: ConcurrentQueue = concurrentQueues[i];
    concurrentQueues[i++] = null;
    const update: ConcurrentUpdate = concurrentQueues[i];
    concurrentQueues[i++] = null;
    const lane: Lane = concurrentQueues[i];
    concurrentQueues[i++] = null;

    if (queue !== null && update !== null) {
      const pending = queue.pending;
       // 每次循环，同一个hook的queue是相同的
      if (pending === null) {
        // This is the first update. Create a circular list.
        update.next = update;
      } else {
        // Append the update to the end of the list.
        update.next = pending.next;
        pending.next = update;
      }
      queue.pending = update;
    }

    if (lane !== NoLane) {
      markUpdateLaneFromFiberToRoot(fiber, update, lane);
    }
  }
}