.

vendor/github.com/valyala/fasthttp/reuseport/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Max Riveiro
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/valyala/fasthttp/reuseport/reuseport.go

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+//go:build !windows && !aix
+
+// Package reuseport provides TCP net.Listener with SO_REUSEPORT support.
+//
+// SO_REUSEPORT allows linear scaling server performance on multi-CPU servers.
+// See https://www.nginx.com/blog/socket-sharding-nginx-release-1-9-1/ for more details :)
+//
+// The package is based on https://github.com/kavu/go_reuseport .
+package reuseport
+
+import (
+	"net"
+	"strings"
+
+	"github.com/valyala/tcplisten"
+)
+
+// 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 https://lwn.net/Articles/508865/ for details.
+//
+// Use https://github.com/valyala/tcplisten 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.
+func Listen(network, addr string) (net.Listener, error) {
+	ln, err := cfg.NewListener(network, addr)
+	if err != nil && strings.Contains(err.Error(), "SO_REUSEPORT") {
+		return nil, &ErrNoReusePort{err}
+	}
+	return ln, err
+}
+
+var cfg = &tcplisten.Config{
+	ReusePort:   true,
+	DeferAccept: true,
+	FastOpen:    true,
+}

vendor/github.com/valyala/fasthttp/reuseport/reuseport_aix.go

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+package reuseport
+
+import (
+	"context"
+	"net"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+var listenConfig = net.ListenConfig{
+	Control: func(network, address string, c syscall.RawConn) (err error) {
+		return c.Control(func(fd uintptr) {
+			err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEADDR, 1)
+			if err == nil {
+				err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)
+			}
+		})
+	},
+}
+
+// Listen returns a TCP listener with the SO_REUSEADDR and SO_REUSEPORT options set.
+func Listen(network, addr string) (net.Listener, error) {
+	return listenConfig.Listen(context.Background(), network, addr)
+}

vendor/github.com/valyala/fasthttp/reuseport/reuseport_error.go

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+package reuseport
+
+import (
+	"fmt"
+)
+
+// ErrNoReusePort is returned if the OS doesn't support SO_REUSEPORT.
+type ErrNoReusePort struct {
+	err error
+}
+
+// Error implements error interface.
+func (e *ErrNoReusePort) Error() string {
+	return fmt.Sprintf("The OS doesn't support SO_REUSEPORT: %v", e.err)
+}

vendor/github.com/valyala/fasthttp/reuseport/reuseport_windows.go

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+package reuseport
+
+import (
+	"context"
+	"net"
+	"syscall"
+
+	"golang.org/x/sys/windows"
+)
+
+var listenConfig = net.ListenConfig{
+	Control: func(network, address string, c syscall.RawConn) (err error) {
+		return c.Control(func(fd uintptr) {
+			err = windows.SetsockoptInt(windows.Handle(fd), windows.SOL_SOCKET, windows.SO_REUSEADDR, 1)
+		})
+	},
+}
+
+// Listen returns TCP listener with SO_REUSEADDR option set, SO_REUSEPORT is not supported on Windows, so it uses
+// SO_REUSEADDR as an alternative to achieve the same effect.
+func Listen(network, addr string) (net.Listener, error) {
+	return listenConfig.Listen(context.Background(), network, addr)
+}