tx_list

txPricedList

// txPricedList is a priced-sorted heap to allow operating on transactions pool
// contents in a priced-incrementing way.
type txPricedList struct {
    all    *txLookup  // Pointer to the map of all transactions
    items  *priceHeap // Heap of prices of all the stored transactions
    stales int        // Number of stale priced points to (re-heap trigger)
}

priceHeap

// priceHeap is a heap.Interface implementation over transactions for retrieving
// priced-sorted transactions to discard when the pool fills up.
type priceHeap []*types.Transaction

数据结构“堆”。