对象属性并发安全锁

package main

import (
    "fmt"
    "sort"
    "sync"
)

type A struct {
    N int
}

func main() {
    a := new(A)
    var wg sync.WaitGroup
    for i := 0; i < 1000; i++ {
        wg.Add(1)
        go func() {
            P(a)
            wg.Done()
        }()
    }
    wg.Wait()
    fmt.Println(haveRepeatEle(xs))
    sort.Ints(xs)
    fmt.Println(len(xs))
}

var xs = []int{}
var mu sync.Mutex

func P(a *A) {
    mu.Lock()
    i := a.N
    a.N++
    xs = append(xs, i)
    mu.Unlock()
}

func haveRepeatEle(xs []int) bool {
    for i := 0; i < len(xs); i++ {
        x := xs[i]
        fmt.Println("i:", i)
        for j := i + 1; j < len(xs); j++ {
            fmt.Println("j:", j)
            if x == xs[j] {
                return true
            }
        }
    }
    return false
}