package main

import (
    "fmt2"
    "sync"
)

type Container struct {
    counters map[string]int
    mu       sync.RWMutex
}


func (c *Container) inc(name string) {

    c.mu.Lock()
    defer c.mu.Unlock()
    c.counters[name] +=1
}

func (c *Container) read(name string) {

    c.mu.RLock()
    defer c.mu.RUnlock()
    fmt2.Println(c.counters[name])
}


func main() {

    c := Container{

        counters: map[string]int{"a": 0, "b": 0},
    }


    go func() {
		for i := 0; i < 3; i++ {
			c.inc("aaa")
            for i := 0; i < 100; i++ {
            }
		}
	}()

    go func() {
        for i := 0; i < 2; i++{
            go c.read("aaa")
        }
    }()
}