Safe concurrent reads

no_race.go

package main

import (
	"fmt"
)

func main()  {
	x := make(map[string]int)
	x["abc"] = 1
	for i := 0; i < 10; i++ {
		go func() {
			c := x["abc"]
			fmt.Println(c)
		}()
	}
}

Output

$ go build --race ./no_race.go
$ ./no_race                   
1
1
1
1
1
1
1
1
1
1