Master the time.NewTimer function in Go language documentation to implement a single timer

Master the time.NewTimer function in the Go language documentation to implement a single timer, and attach specific code examples.

Time is the benchmark of our lives, and timers are one of the most commonly used tools in programming. In the Go language, we can use the time package to handle time-related operations, and the NewTimer function can be used to create a one-shot timer. This article will introduce how to use the NewTimer function to implement a simple one-shot timer, and attach specific code examples.

In the Go language, the time package provides many time-related functions and types, including a function called NewTimer. The NewTimer function is defined as follows:

func NewTimer(d Duration) *Timer

The NewTimer function will return a pointer of type Timer. The Timer type represents a one-shot timer. It has a channel named C and when the timer expires it sends a time to the channel. We can get notification of timer expiration by reading data from this channel.

The following is a sample code that uses the NewTimer function to create a single timer:

package main

import (
    "fmt"
    "time"
)

func main() {
    // 创建一个持续2秒的定时器
    timer1 := time.NewTimer(2 * time.Second)

    // 等待定时器到期
    <-timer1.C
    fmt.Println("定时器1已经到期")

    // 创建一个持续1秒的定时器
    timer2 := time.NewTimer(time.Second)

    // 在另一个goroutine中等待定时器到期
    go func() {
        <-timer2.C
        fmt.Println("定时器2已经到期")
    }()

    // 阻塞主goroutine，使程序不会立即退出
    time.Sleep(3 * time.Second)
}

In the above code, we first use the NewTimer function of the time package to create two timers, respectively. for timer1 and timer2. The duration of timer1 is 2 seconds and the duration of timer2 is 1 second.

In the next line of timer timer1, we use the syntax to wait for the timer to expire. When the data in channel timer1.C is read, we know that the timer has expired. We can see in the console whether the timer has expired by outputting the corresponding message.

In the next line of timer timer2, we wait for the timer to expire in a new goroutine. This ensures that the expiration of the timer does not block the running of the main goroutine.

Finally, we use the Sleep function of the time package to block the main goroutine so that the program does not exit immediately. After waiting for 3 seconds, both timers timer1 and timer2 have expired, and corresponding messages will be output.

Through the sample code in this article, we can understand and master how to use the time.NewTimer function in the Go language document to implement a single timer. I hope this article can be helpful to everyone.

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