how to make Goroutine not Concurrency if Same Function - file

Question

Is there any way to make goroutine execute one after another ( one by one) if it was the same function?
I didn't mean to use goroutine firstly. However, "os/exec" function in TCP will cause the tcp forced to stop. Thus I use goroutine to avoid crashing. But I still want them to execute by order, instead of concurrently. Here is my code.
func handleTCP(conn net.Conn) {
defer conn.Close()
fmt.Println("handle TCP function")
for {
wg := new(sync.WaitGroup)
wg.Add(1)
go func() {
cmdArgs := []string{temp_str, test_press, gh, "sample.csv"}
cmd := exec.Command("calib.exe", cmdArgs...)
wg.Done()
}()
}
}

Answer 1

You can use locks to limit access to a resource to one thread at a time as follows
i := 1
iLock = &sync.Mutex{}
for {
go func() {
iLock.Lock()
fmt.Printf("Value of i: %d\n", i)
iLock.Unlock()
}
}
More examples here
Not sure what you are using the WaitGroup for. If it is to achieve the sequentiality you desire, then it can be removed.

Answer 2

Try to put the lock into function, it makes theirs execution sequential. But remember about wg.Done() must be under defer at first line of the function.
Something like this:
var mu sync.Mutex
func handleTCP(conn net.Conn) {
defer conn.Close()
fmt.Println("handle TCP function")
for {
wg := new(sync.WaitGroup)
wg.Add(1)
go func() {
defer wg.Done()
mu.Lock()
defer mu.UnLock()
cmdArgs := []string{temp_str, test_press, gh, "sample.csv"}
cmd := exec.Command("calib.exe", cmdArgs...)
}()
}
}