New get a new queue.

NewHighLowQueue creates a new high-low queue with the given parameters maxQueueSize, defaultQueueSize is 100.

NewPriorityQueue creates a new instance of PriorityQueue.

ErrClosed is returned when trying to get an item from a closed queue.

ErrEmpty is returned when trying to remove an item from an empty queue.

ErrFull is returned when trying to add an item to a full queue.

HighLowQueue 一个基于channel的高低优先级队列，先进先出，队列为空时阻塞.

PriorityQueue 一个可以设置内容优先级的队列，可设置在同等优先级下的内容先入先出或后入先出，队列为空时不阻塞.

Queue queue for go.