check golang sync map about race conditions

sync_map

package main

import (
	"fmt"
	"sync"
)

var t sync.Map

func main() {
	fmt.Println("Hello, playground")
	t.Store("key",0)
	var wg sync.WaitGroup
	wg.Add(2)
	go func() {
		for i:=1; i<=100;i++ {
			res, ok := t.Load("key")
			fmt.Println("res: ", res.(int))
			if ok {
				t.Store("key", res.(int)+1) 
			} 	
		}
		defer wg.Done()
	}()
	go func() {
		for i:=1; i<=100;i++ {
			res, ok := t.Load("key")
			fmt.Println("res: ", res.(int))
			if ok {
				t.Store("key", res.(int)+1) 
			} 	
		}
		defer wg.Done()
	}()
	wg.Wait()
}