Go Concurrency Hello World Goroutine
Example
single channel, single goroutine, one write, one read.
package main
import "fmt"
import "time"
func main() {
// create new channel of type string
ch := make(chan string)
// start new anonymous goroutine
go func() {
time.Sleep(time.Second)
// send "Hello World" to channel
ch <- "Hello World"
}()
// read from channel
msg, ok := <-ch
fmt.Printf("msg='%s', ok='%v'\n", msg, ok)
}
The channel ch is an unbuffered or synchronous channel.
The time.Sleep is here to illustrate main() function will wait on the ch channel, which means the function literal executed as a goroutine has the time to send a value through that channel: the receive operator <-ch will block the execution of main(). If it didn't, the goroutine would be killed when main() exits, and would not have time to send its value.
