Go 并发随机打印1-n

package main

import (

    "fmt"

    "math/rand"

    "sync"

    "time"

)

var (

    count int32

    mutex sync.Mutex

)

func main() {

    PrintN(100)

}

//PrintN PrintN

func PrintN(n int) {

    var syn sync.WaitGroup

    syn.Add(n)

    r := rand.New(rand.NewSource(time.Now().UnixNano()))

    var array = make([]int, n+1)

    for i := 1; i <= n; i++ {

        go func() {

            for {

                mutex.Lock()

　　　　　  randn := r.Intn(n) + 1

                if array[randn] == 0 {

                    array[randn] = 1

                    mutex.Unlock()

                    fmt.Println(randn)

                    syn.Done()

                    break

                }

                mutex.Unlock()

            }

        }()

    }

    syn.Wait()

}