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Title: 27.Select.go
Author: OpenSource
Date: 2017-05-21
Description: For Study
Go’s select lets you wait on multiple channel operations.
Combining goroutines and channels with select is a powerful feature of Go.
package main
import "time"
import "fmt"
func main(){
fmt.Println("c1 := make(chan string)")
fmt.Println("c2 := make(chan string)")
c1 := make(chan string)
c2 := make(chan string)
// For our example we’ll select across two channels.
// Each channel will receive a value after some amount of time, to simulate e.g.
// blocking RPC operations executing in concurrent goroutines.
go func(){
time.Sleep(time.Second * 1)
c1 <- "one"
go func(){
time.Sleep(time.Second * 2)
c2 <- "two"
// We’ll use select to await both of these values simultaneously,
// printing each one as it arrives
for i := 0; i < 2; i++ {
case msg1 := <- c1:
fmt.Println("received", msg1)
case msg2 := <- c2:
fmt.Println("received", msg2)
// We receive the values "one" and then "two" as expected.
// Note that the total execution time is only ~2 seconds
// since both the 1 and 2 second Sleeps execute concurrently.
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