go之单例模式

import (
  "fmt"
  "sync"
  "testing"
  "unsafe"
)
 
type Singleton struct {
}
 
var singLeInstance *Singleton
var once sync.Once
 
//单例模式
func GetSingletonObj() *Singleton {
  //仅运行一次
  once.Do(func() {
    fmt.Println("Create Obj")
    singLeInstance = new(Singleton)
  })
  return singLeInstance
}
 
func TestGetSingletonObj(t *testing.T) {
  var wg sync.WaitGroup
  for i := 0; i < 10; i++ {
    wg.Add(1)
    go func() {
      obj := GetSingletonObj()
      fmt.Printf("%x\n", unsafe.Pointer(obj))
      wg.Done()
    }()
 
  }
  wg.Wait()
}