package main

import (
	"fmt"
	"sync"
	"time"

	"golang.org/x/exp/slices"
)

type Test struct {
	t string
}

var sessions []*Test
var ws sync.WaitGroup

func main() {
	ws.Add(1)
	go appendTest()
	ws.Add(1)
	go deleteTest(sessions)
	ws.Wait()
	fmt.Println("In main After deleteTest global sessions =", sessions)
}
func appendTest() {
	defer ws.Done()
	sessions = append(sessions, &Test{t: "a"})
	sessions = append(sessions, &Test{t: "b"})
	sessions = append(sessions, &Test{t: "c"})
	fmt.Println("Append done sessions =", sessions)
}

func deleteTest(sessions []*Test) {
	defer ws.Done()
	for {
		if len(sessions) == 0 {
			fmt.Println("continue")
			time.Sleep(5 * time.Second)
			continue
		}
		fmt.Println("In deleteTest Before delete sessions =", sessions)
		sessions = slices.Delete(sessions, 0, 1)
		fmt.Println("In deleteTest After delete sessions =", sessions)
	}
}