Go language learning notes - mutex start go language from scratch

Learning notes , Where is where .

Only one coroutine can access the resource at the same time , Other threads can only wait , Mutual exclusivity . Mutexes are often used in work projects , But pay attention to deadlock , That is, you must pay attention to whether the process of releasing the lock can be executed .

The sample code is as follows

package main

import (
	"fmt"
	"sync"
	"time"
)

var (
	count  int
	myLock sync.Mutex
	wg1    sync.WaitGroup
)

func GetCount() int {
	myLock.Lock()
	fmt.Println("GetCount lock ")
	defer myLock.Unlock()
	defer fmt.Println("GetCount unlock ")
	return count
}

func IncCount() {
	myLock.Lock()
	fmt.Println("IncCount lock ")
	defer myLock.Unlock()
	defer fmt.Println("IncCount unlock ")
	count += 1
}

func main() {
	wg1.Add(2)
	go func() {
		defer wg1.Done()
		for i := 0; i < 11; i++ {
			fmt.Println("count -> ", GetCount())
			time.Sleep(1 * time.Second)
		}
	}()
	go func() {
		defer wg1.Done()
		for i := 0; i < 10; i++ {
			IncCount()
			fmt.Println("count -> add 1")
			time.Sleep(1 * time.Second)
		}
	}()
	wg