Right way to wait for condition from another goroutine?

[beginninggo]

Hi,
I’m very new to Go and currently learning concurrency. I need a way to concurrently execute a maximum of two tasks at a time. Here is what I’ve coded:

func ExecuteTask(wg *sync.WorkGroup) {
    var wg2 sync.WorkGroup
    wg2.Add(1)
    go CheckTotal(&wg2)
    wg2.Wait()
    //Rest of the code with total--, then wg.Done()
}

var total int = 0
var mut sync.Mutex

func CheckTotal(wg *sync.WorkGroup) {
    for {
        if total < 2 {
           mut.Lock()
           total++
           mut.Unlock()
           wg.Done()
       }
    }
}

func main() {
    var wg sync.WorkGroup
    wg.Add(10)
    for i:=0; i<10; i++ {
        ExecuteTask(&wg)
    }
    wg.Wait()
}

This works but using the for loop inside the CheckTotal feels hacky. What would be the correct way to accomplish this?
Thank you

[ncw (Nick Craig-Wood)]

The usual way of doing this is with channels, eg

http://jmoiron.net/blog/limiting-concurrency-in-go/