go协程超时后怎么中断协程执行的任务

可以用runtime.Goexit()停止当前Go协程

package main

import (
    "log"
    "runtime"
    "time"
)

func main() {
    cb := make(chan bool, 1)
    go func() {
        timer2 := time.NewTimer(time.Second * 3)
        tick := time.Tick(time.Second * 5)
        select {
        case <-timer2.C:
            runtime.Goexit() //超时后退出该Go协程
        case <-tick: //模拟超时任务
            log.Println(222) //处理业务代码
            cb <- true
            return
        }
    }()
    log.Println()
    timer := time.NewTimer(time.Second * 2)
    select {
    case <-timer.C:
        log.Println("time out")
        cb <- false
    case tmp := <-cb:
        log.Println(tmp)
    }
    time.Sleep(time.Second * 10)
    log.Println(123)
}

package main

import (
    "log"
    "time"
)

func main() {
    cb := make(chan bool, 1)
    go func() {
        timer2 := time.NewTimer(time.Second * 5)
        select {
        case <-timer2.C:
            log.Println(222)
            cb <- true
        case <-cb:
            return
        }
    }()
    log.Println()
    timer := time.NewTimer(time.Second * 2)
    select {
    case <-timer.C:
        log.Println("time out")
        cb <- false
    case tmp := <-cb:
        log.Println(tmp)
    }
    time.Sleep(time.Second * 10)
    log.Println(123)
}

timer2 再定义一个的话没法执行逻辑代码吧