为什么80%的码农都做不了架构师？>>> 
select 可以同时监听多个 channel, 阻塞直到某个分支可执行，若多个都准备好的时候，随机选一个
package main
import(
"fmt"
)
func fib(c, quit chan int) {
x, y := 0, 1
for {
select {
case c <- x:
x, y = y, x+y
case <- quit:
fmt.Println("quit")
return
}
}
}
func main() {
c := make (chan int)
quit := make(chan int)
go func() {
for i:=0; i < 10; i++ {
fmt.Println(<-c)
}
quit <- 0
}()
fib(c, quit)
}
输出:
C:\Go\bin\go.exe run C:\Go\src\flag\s6.go
0
1
1
2
3
5
8
13
21
34
quit
package main
import(
"fmt"
"time"
)
func main() {
tick := time.Tick(100 * time.Millisecond)
boom := time.After(500 * time.Millisecond)
for {
select {
case <-tick:
fmt.Println("tick.")
case <-boom:
fmt.Println("BooM!")
return
default:
fmt.Println(" $$")
time.Sleep(50 * time.Millisecond)
}
}
}输出 ：
C:\Go\bin\go.exe run C:\Go\src\flag\s7.go
$$
$$
tick.
$$
$$
tick.
$$
$$
tick.
$$
$$
tick.
$$
$$
BooM!