go同步锁 sync mutex

goroutine

http://127.0.0.1:3999/concurrency/11

go tour 到此 就结束了.

继续 学习 可以 从 以下网站

文档

https://golang.org/doc/

https://golang.org/doc/code

https://golang.org/doc/codewalk/functions/

博客

https://go.dev/blog/

wiki 服务器教程

服务器 教程 入口
https://golang.org/doc/articles/wiki/

https://github.com/gin-gonic/gin

官网

https://golang.org/

sync.mutex Lock

package mainimport ("fmt""sync""time"
)// SafeCounter is safe to use concurrently.
type SafeCounter struct {mu sync.Mutexv  map[string]int
}// Inc increments the counter for the given key.
func (c *SafeCounter) Inc(key string) {c.mu.Lock()// Lock so only one goroutine at a time can access the map c.v.c.v[key]++c.mu.Unlock()
}// Value returns the current value of the counter for the given key.
func (c *SafeCounter) Value(key string) int {c.mu.Lock()// Lock so only one goroutine at a time can access the map c.v.defer c.mu.Unlock()return c.v[key]
}func main() {c := SafeCounter{v: make(map[string]int)}for i := 0; i < 1000; i++ {go c.Inc("somekey")}time.Sleep(time.Second)fmt.Println(c.Value("somekey"))
}