Go 루틴 통신에서 Go의 '모든 Goroutines Are Sleep' 교착 상태를 해결하는 방법은 무엇입니까?

// Define a WaitGroup to track the completion of the loading goroutines
var wg sync.WaitGroup

// Start goroutines to load trucks
go func() {
    // Load trucks and send them over the truck channel
    for t := range trucks {
        go func(tr Truck) {
            itm := Item{}
            itm.name = "Groceries"

            fmt.Printf("Loading %s\n", tr.name)
            tr.Cargo = append(tr.Cargo, itm)
            ch <- tr

            wg.Done() // Signal the WaitGroup that the loading is complete
        }(trucks[t])
    }
}()

// Use the WaitGroup to wait for all loading goroutines to complete
wg.Wait()

// Close the truck channel after all loading is finished
close(ch)

// Start the UnloadTrucks goroutine
UnloadTrucks(ch)