11.5 传统同步机制

一、传统同步机制(不建议使用)

1. WaitGroup

2. Mutex

   package main
   
   import (
   	"fmt"
   	"sync"
   	"time"
   )
   
   type atomicInt struct {
   	value int
   	lock  sync.Mutex
   }
   
   func (a *atomicInt) increment() {
   	a.lock.Lock()
   	defer a.lock.Unlock()
   
   	a.value++
   }
   
   func (a *atomicInt) get() int {
   	a.lock.Lock()
   	defer a.lock.Unlock()
   	return a.value
   }
   
   func main() {
   	var a atomicInt
   	a.increment()
   	go func() {
   		a.increment()
   	}()
   	time.Sleep(time.Millisecond)
   	fmt.Println(a.get())
   }

3. Cond