Mutex và RWMutex dùng khi nào?

sync.Mutex: Lock()/Unlock() cho exclusive access (1 goroutine tại 1 thời điểm). sync.RWMutex: RLock() cho nhiều readers đồng thời, Lock() cho exclusive write.

• Dùng khi shared state giữa goroutines.
• Luôn defer mu.Unlock().
• Tránh deadlock: lock order nhất quán.

sync.Mutex: Lock()/Unlock() for exclusive access (one goroutine at a time). sync.RWMutex: RLock() allows multiple concurrent readers, Lock() for exclusive writes.

• Use when goroutines share mutable state.
• Always defer mu.Unlock().
• Prevent deadlocks by acquiring locks in a consistent order.