39 lines
932 B
Go
39 lines
932 B
Go
// A _goroutine_ is a lightweight thread of execution.
|
|
|
|
package main
|
|
|
|
import "fmt"
|
|
|
|
func f(from string) {
|
|
for i := 0; i < 3; i++ {
|
|
fmt.Println(from, ":", i)
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
|
|
// Suppose we have a function call `f(s)`. Here's how
|
|
// we'd call that in the usual way, running it
|
|
// synchronously.
|
|
f("direct")
|
|
|
|
// To invoke this function in a goroutine, use
|
|
// `go f(s)`. This new goroutine will execute
|
|
// concurrently with the calling one.
|
|
go f("goroutine")
|
|
|
|
// You can also start a goroutine for an anonymous
|
|
// function call.
|
|
go func(msg string) {
|
|
fmt.Println(msg)
|
|
}("going")
|
|
|
|
// Our two function calls are running asynchronously in
|
|
// separate goroutines now, so execution falls through
|
|
// to here. This `Scanln` code requires we press a key
|
|
// before the program exits.
|
|
var input string
|
|
fmt.Scanln(&input)
|
|
fmt.Println("done")
|
|
}
|