util

Documentation

Index

• Variables
• type RingBuffer
  • func NewRingBuffer(size uint64) *RingBuffer
  • func (rb *RingBuffer) Dispose()
  • func (rb *RingBuffer) Len() uint64
  • func (rb *RingBuffer) Offer(item interface{}) (bool, error)
  • func (rb *RingBuffer) Poll(block bool) (interface{}, error)
  • func (rb *RingBuffer) Reset()

Variables

var (
	// ErrDisposed is returned when an operation is performed on a disposed
	// queue.
	ErrDisposed = errors.New(`queue: disposed`)
)

Types

type RingBuffer

type RingBuffer struct {
	// contains filtered or unexported fields
}

RingBuffer is a MPMC buffer that achieves threadsafety with CAS operations only. A put on full or get on empty call will block until an item is put or retrieved. Calling Dispose on the RingBuffer will unblock any blocked threads with an error. This buffer is similar to the buffer described here: http://www.1024cores.net/home/lock-free-algorithms/queues/bounded-mpmc-queue with some minor additions.

func NewRingBuffer

func NewRingBuffer(size uint64) *RingBuffer

NewRingBuffer will allocate, initialize, and return a ring buffer with the specified size.

func (*RingBuffer) Dispose

func (rb *RingBuffer) Dispose()

Dispose will dispose of this queue and free any blocked threads in the Put and/or Get methods. Calling those methods on a disposed queue will return an error.

func (*RingBuffer) Len

func (rb *RingBuffer) Len() uint64

Len returns the number of items in the queue.

func (*RingBuffer) Offer

func (rb *RingBuffer) Offer(item interface{}) (bool, error)

Offer adds the provided item to the queue if there is space. If the queue is full, this call will return false. An error will be returned if the queue is disposed.

func (*RingBuffer) Poll

func (rb *RingBuffer) Poll(block bool) (interface{}, error)

Poll will return the next item in the queue. This call will block if the queue is empty. This call will unblock when an item is added to the queue, Dispose is called on the queue, or the timeout is reached. An error will be returned if the queue is disposed or a timeout occurs. A non-positive timeout will block indefinitely.

func (*RingBuffer) Reset

func (rb *RingBuffer) Reset()