Is it possible to perform safe data reading from a map data structure without the risk of errors?

In Go, reading from a map is safe if no one is modifying the map at the same time. However, if there is concurrent writing (adding, deleting, or modifying elements), reading can lead to a panic (runtime error).

To safely read from a map in a multithreaded environment, the following are usually used:

• sync.RWMutex — to lock the map for writing and allow concurrent reads
• sync.Map — a specialized thread-safe data structure for maps

Example with RWMutex:

var (
    m = make(map[string]int)
    mu sync.RWMutex
)

func read(key string) (int, bool) {
    mu.RLock()
    defer mu.RUnlock()
    val, ok := m[key]
    return val, ok
}

func write(key string, val int) {
    mu.Lock()
    defer mu.Unlock()
    m[key] = val
}

Thus, safe reading is possible if synchronization with writing is ensured.