What is better to use for synchronization when working with concurrent access: mutex or sync.Map?

To synchronize concurrent access in Go, you can choose between mutex and sync.Map depending on the task:

• sync.Mutex is a lock primitive that protects critical sections. It is versatile and suitable when you need to synchronize access to any data, especially if operations are complex or involve multiple data types.

• sync.Map is a specialized data structure optimized for concurrent access to a map with frequent reads and infrequent writes. It implements internal synchronization mechanisms and is suitable when you need safe concurrent read/write without explicit mutexes.

If you have a simple map with frequent reads and rare writes, sync.Map can be more convenient and efficient. For more complex synchronization logic or different data types, use mutex.

Example with sync.Mutex:

var mu sync.Mutex
var counter int

func increment() {
    mu.Lock()
    defer mu.Unlock()
    counter++
}

Example with sync.Map:

var m sync.Map

func storeValue(key string, value interface{}) {
    m.Store(key, value)
}

func loadValue(key string) (interface{}, bool) {
    return m.Load(key)
}

In summary: for general synchronization, use mutex; for concurrent map access, sync.Map.