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)
}