Mis on sync.Once tüübi peamine roll Go niitide sünkroniseerimisel?

The sync.Once type in Go is used to ensure that a specific piece of code is executed exactly once, even if called from multiple threads (goroutines).

Its main role is safe initialization of resources (e.g., creating a singleton), to prevent race conditions and repeated execution.

Example of usage:

var once sync.Once
var config *Config

func loadConfig() {
    config = &Config{/* initialization */}
}

func GetConfig() *Config {
    once.Do(loadConfig) // loadConfig will be called only once
    return config
}

Thus, sync.Once guarantees thread-safe, one-time execution of a function.