reuseport - ActiveState ActiveGo 1.8

Package reuseport

import ""

Overview ▾

Package reuseport provides TCP net.Listener with SO_REUSEPORT support.

SO_REUSEPORT allows linear scaling server performance on multi-CPU servers. See for more details :)

The package is based on .

func Listen

func Listen(network, addr string) (net.Listener, error)

Listen returns TCP listener with SO_REUSEPORT option set.

The returned listener tries enabling the following TCP options, which usually have positive impact on performance:

- TCP_DEFER_ACCEPT. This option expects that the server reads from accepted

connections before writing to them.

- TCP_FASTOPEN. See for details.

Use if you want customizing these options.

Only tcp4 and tcp6 networks are supported.

ErrNoReusePort error is returned if the system doesn't support SO_REUSEPORT.



package reuseport_test

import (


func ExampleListen() {
    ln, err := reuseport.Listen("tcp4", "localhost:12345")
    if err != nil {
        log.Fatalf("error in reuseport listener: %s", err)

    if err = fasthttp.Serve(ln, requestHandler); err != nil {
        log.Fatalf("error in fasthttp Server: %s", err)

func requestHandler(ctx *fasthttp.RequestCtx) {
    fmt.Fprintf(ctx, "Hello, world!")

type ErrNoReusePort

ErrNoReusePort is returned if the OS doesn't support SO_REUSEPORT.

type ErrNoReusePort struct {
    // contains filtered or unexported fields

func (*ErrNoReusePort) Error

func (e *ErrNoReusePort) Error() string

Error implements error interface.