有没buffer的channel例子代码

channel0.go

package main

import (
	"log"
	"time"
)

func chan0SendOnly() {
	c0 := make(chan bool)
	log.Println("c0, sending")
	c0 <- true
	log.Println("c0, send success")
}

func chan1SendRecv() {
	c1 := make(chan bool)
	go func() {
		log.Println("c1, sending")
		c1 <- true
		log.Println("c1, send success")
	}()
	go func() {
		log.Println("c1, receiving")
		time.Sleep(2 * time.Second)
		<-c1
		log.Println("c1, recv success")
	}()
}

func chan2SendOnly() {
	c2 := make(chan bool, 1)
	log.Println("c2, sending")
	c2 <- true
	log.Println("c2, send success")
}

func chan3SendRecv() {
	c3 := make(chan bool, 1)
	go func() {
		log.Println("c3, sending")
		c3 <- true
		log.Println("c3, send success")
	}()
	go func() {
		log.Println("c3, receiving")
		time.Sleep(2 * time.Second)
		<-c3
		log.Println("c3, recv success")
	}()
}

func main() {
	go chan0SendOnly()
	time.Sleep(1 * time.Second)

	go chan1SendRecv()
	time.Sleep(3 * time.Second)

	go chan2SendOnly()
	time.Sleep(1 * time.Second)

	go chan3SendRecv()
	time.Sleep(3 * time.Second)
}