协程

package main

import (
    "fmt"
)

func main() {
    c := make(chan int)
    go func() {
        for i := 0; i < 10; i = i + 1 {
            c <- i
        }
        close(c)
    }()

    for i := range c {
        //fmt.Println(<-c)
        fmt.Println("i=", i)
    }
    
    //-------------------------

    ch := make(chan int)
    quit := make(chan int)
    go func() {
        for i := 0; i < 10; i++ {
            fmt.Println(<-ch)
        }
        quit <- 0
    }()
    fibonacci(ch, quit)
}

func fibonacci(c, quit chan int) {
    x, y := 0, 1
    for {
        select {
        case c <- x:
            x, y = y, x+y
        case <-quit:
            fmt.Println("quit")
            return
        }
    }
}