-
Notifications
You must be signed in to change notification settings - Fork 27
/
go-routines.go
38 lines (29 loc) · 1.06 KB
/
go-routines.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
package main
import (
"fmt"
"time"
)
func f(from string) {
for i := 0; i < 3; i++ {
fmt.Println(from, ":", i)
}
}
// GoRoutines illustrate go routines
func GoRoutines() {
// A goroutine is a lightweight thread of execution.
// 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 requires we press a key before the program exits.
time.Sleep(2 * time.Second)
fmt.Println("Done")
// When we run this program, we see the output of the blocking call first,
// then the interleaved output of the two goroutines.
// This interleaving reflects the goroutines being run concurrently by the Go runtime.
}