Goroutines

Lightweight concurrency and threading

Go routines are essentially lightweight threads managed by the go runtime. We use the go keyword in front of a function to specify that it is a routine

goroutine_demo.go

package main

import (
  "fmt"
  "time"
)

func main() {
  // run the say function in a goroutine
  go say("world")
  say("hello")
}

// intentionally delay the say function, so simulate a long
// running proccess
func say(s string) {
  for i := 0; i < 5; i++ {
    time.Sleep(100 * time.Millisecond)
    fmt.Println(s)
  }
}

$ go run goroutine_demo.go
hello
world
world
hello
world
hello
world
hello
world
hello