golang无缓冲通道

无缓冲通道

通道是goroutine之间的安全通讯机制。是阻塞/同步机制

package main

import (
  "fmt"
  "math/rand"
  "sync"
  "time"
)

var wg sync.WaitGroup

func init() {
  rand.Seed(time.Now().UnixNano())
}

func main() {
  cc := make(chan byte)

  wg.Add(2)

  // 运动员就绪
  go playball("ping jie", cc)
  go playball("luo ge", cc)

  cc <- 1

  wg.Wait()
}

// 运动员
func playball(name string, cc chan byte) {
  defer wg.Done()

  for {
    // 接球
    ball, ok := <-cc
    if !ok {
      fmt.Printf("Player %s Won\n", name)
      return
    }

    // 结束条件判断
    n := rand.Intn(50)
    if n%9 == 0 {
      fmt.Printf("Player %s Missed\n", name)
      close(cc)
      return
    }

    // 发球
    fmt.Printf("Player %s Hit %d\n", name, ball)
    cc <- ball
  }
}