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
}

Go functions default to using value objects rather than references.
Depending on your datastructure, this makes goroutines fairly concurrency-safe, since it operates on a copy of the data, rather than the same data.

func printThing(a string) {
    fmt.Println(a)
}


go printThing("abc")