How to lock/synchronize access to a variable in Go during concurrent goroutines?

In his answer to this question: Golang for Windows erratic behavior? user @distributed recommended to lock/synchronize access to a shared variable on concurrent goroutines.

How can I do that?

More on the issue:

I get this code (the returned function with a closure on views ) running on several goroutines at the same time:

func makeHomeHandler() func(c *http.Conn, r *http.Request) {
    views := 1
    return func(c *http.Conn, r *http.Request) {
        fmt.Fprintf(c, "Counting %s, %d so far.", r.URL.Path[1:], views)
        views++
    }
}

It looks like the IO function takes it’s time, and as a result I get this kind of output:

Counting monkeys, 5 so far.
Counting monkeys, 5 so far.
Counting monkeys, 5 so far.
Counting monkeys, 8 so far.
Counting monkeys, 8 so far.
Counting monkeys, 8 so far.
Counting monkeys, 11 so far.

It increments fine, but when it gets printed I can see that the operation printing+incrementing is not atomic at all.

If I change it to:

func makeHomeHandler() func(c *http.Conn, r *http.Request) {
    views := 0
    return func(c *http.Conn, r *http.Request) {
        views++
        // I can only hope that other goroutine does not increment the counter 
        // at this point, i.e., right after the previous line and before the 
        // next one are executed!
        views_now := views
        fmt.Fprintf(c, "Counting %s, %d so far.", r.URL.Path[1:], views_now)
    }
}

It seems to work fine, but I’m not completely sure if it will not fail eventually…