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copied!<pre><code>package main import ( "encoding/json" "fmt" "sync" ) type Window struct { Height int64 `json:"Height"` Width int64 `json:"Width"` } type Room struct { mu sync.Mutex Windows []Window `json:"Windows"` } func main() { js := []byte(`{"Windows":[{"Height":10,"Width":20},{"Height":10,"Width":20}]}`) fmt.Printf("Should have 2 windows: %v\n", string(js)) var room Room _ = json.Unmarshal(js, &room) var wg sync.WaitGroup // Add meny windows to room for i := 0; i < 10; i++ { wg.Add(1) go func() { defer wg.Done() addWindow(&room) }() } wg.Wait() js, _ = json.Marshal(room) fmt.Printf("Sould have 12 windows: %v\n", string(js)) } func addWindow(r *Room) { window := Window{1, 1} fmt.Printf("Adding %v to %v\n", window, r.Windows) r.mu.Lock() defer r.mu.Unlock() r.Windows = append(r.Windows, window) } Should have 2 windows: {"Windows":[{"Height":10,"Width":20},{"Height":10,"Width":20}]} Adding {1 1} to [{10 20} {10 20}] Adding {1 1} to [{10 20} {10 20} {1 1}] Adding {1 1} to [{10 20} {10 20} {1 1} {1 1}] Adding {1 1} to [{10 20} {10 20} {1 1} {1 1} {1 1}] Adding {1 1} to [{10 20} {10 20} {1 1} {1 1} {1 1} {1 1}] Adding {1 1} to [{10 20} {10 20} {1 1} {1 1} {1 1} {1 1} {1 1}] Adding {1 1} to [{10 20} {10 20} {1 1} {1 1} {1 1} {1 1} {1 1} {1 1}] Adding {1 1} to [{10 20} {10 20} {1 1} {1 1} {1 1} {1 1} {1 1} {1 1} {1 1}] Adding {1 1} to [{10 20} {10 20} {1 1} {1 1} {1 1} {1 1} {1 1} {1 1} {1 1} {1 1}] Adding {1 1} to [{10 20} {10 20} {1 1} {1 1} {1 1} {1 1} {1 1} {1 1} {1 1} {1 1} {1 1}] Sould have 12 windows: {"Windows":[{"Height":10,"Width":20},{"Height":10,"Width":20},{"Height":1,"Width":1},{"Height":1,"Width":1},{"Height":1,"Width":1},{"Height":1,"Width":1},{"Height":1,"Width":1},{"Height":1,"Width":1},{"Height":1,"Width":1},{"Height":1,"Width":1},{"Height":1,"Width":1},{"Height":1,"Width":1}]} </code></pre>

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