A simple time server for demonstrating a mix of pthreads and goroutines

clock_threaded.go

package main

import (
	pthread "github.com/lukeb42/go-pthreads"
	"fmt"
	"io"
	"log"
	"net"
	"time"
)

func main() {
	fmt.Println("Binding to localhost:8000")
	thread1 := pthread.Create(spinner, 70*time.Millisecond)
	thread2 := pthread.Create(listener, nil)

	input := ""
	fmt.Scanln(&input) // Hit return to exit.
	thread1.Kill()
	thread2.Kill()
}

// Must accept an interface type as this is intended to be a pthread
func listener(args interface{}) {
	listener, err := net.Listen("tcp", "localhost:8000")
	if err != nil {
		log.Fatal(err)
	}
	for {
		conn, err := listener.Accept()
		if err != nil {
			log.Print(err) // e.g., connection aborted
			continue
		}
		go handleConn(conn) // handle connections in coroutines
	}

}

func handleConn(c net.Conn) {
	defer c.Close()
	for {
		_, err := io.WriteString(c, time.Now().Format("15:04:05\n"))
		if err != nil {
			return // e.g., client disconnected
		}
		time.Sleep(1 * time.Second)
	}
}

func spinner(args interface{}) {
	delay := args.(time.Duration)
	for {
		for _, r := range `-\|/` {
			fmt.Printf("\r%c", r)
			time.Sleep(delay)
		}
	}
}