How to use timer Goroutine to perform delayed operations?

Timer Goroutine can be used to perform delayed operations in Go. Create a timer via time.NewTimer() whose C channel receives a signal to indicate the end of the delay. Timers can be stopped with timer.Stop(). The following practical case demonstrates how to use a timer Goroutine to simulate a network request and return a response or timeout after 5 seconds.

How to use timer Goroutine to perform delay operations

In Go, timer Goroutine can be used to easily implement delay operate. Timer Goroutines provide a non-blocking way to delay program execution.

Using timer Goroutine

To use timer Goroutine, you need to call time.NewTimer(). This function returns a timer type containing a C channel that receives a signal to indicate that the requested delay has elapsed:

package main

import (
    "fmt"
    "time"
)

func main() {
    // 创建一个持续 5 秒的计时器
    timer := time.NewTimer(5 * time.Second)

    // 监听计时器 C 通道中的信号
    <-timer.C
    fmt.Println("5 秒已过")
}

Stop timer

If desired, you can stop the timer before it expires. Call the timer.Stop() method to cancel the timer:

timer.Stop()

Practical case

The following is a practical example of using timer Goroutine to simulate network requests Case:

package main

import (
    "fmt"
    "net/http"
    "time"
)

func main() {
    // 模拟发送网络请求
    request := func() (resp *http.Response, err error) {
        // 假装向网络发送请求并等待 5 秒
        timer := time.NewTimer(5 * time.Second)
        defer timer.Stop()
        select {
        case <-timer.C:
            resp = &http.Response{}
        }
        return resp, nil
    }

    // 使用计时器 Goroutine发送请求
    resp, err := request()
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println(resp)
}

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