Go Example--状态协程

package main

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

type readOp struct {
	key  int
	resp chan int
}
type writeOp struct {
	key  int
	val  int
	resp chan bool
}

func main() {
	var ops int64
	reads := make(chan *readOp)
	writes := make(chan *writeOp)
	go func() {
		//在该协程中定义的map，通过其他协程来读取数据,因为map不是协程安全的,所以只能一个协程来读取
		var state = make(map[int]int)
		for {
			select {
			case read := <-reads:
				read.resp <- state[read.key]
			case write := <-writes:
				write.resp <- true
			}
		}
	}()
	for r := 0; r < 100; r++ {
		go func() {
			for {
				read := &readOp{
					key:  rand.Intn(5),
					resp: make(chan int),
				}
				reads <- read
				<-read.resp
				atomic.AddInt64(&ops, 1)
			}
		}()
	}
	for w := 0; w < 10; w++ {
		go func() {
			for {
				write := &writeOp{
					key:  rand.Intn(5),
					val:  rand.Intn(100),
					resp: make(chan bool),
				}
				writes <- write
				<-write.resp
				atomic.AddInt64(&ops, 1)
			}
		}()
	}
	time.Sleep(time.Second)
	opsFinal := atomic.LoadInt64(&ops)
	fmt.Println("ops:", opsFinal)
}