Golang concurrency

Goroutines

Goroutines use green-threads rather than os-threads.
An OS thread is relatively expensive in setup and memory. One thread is reserved for a particular stack.
Go abstracts threads/threadpools with goroutines to make threads relatively cheap.

func doThing() {
    fmt.Println("hi")
}

func main() {
    go sayHello()  // <-- run in thread
}