How to close thread in golang

Golang is a relatively new programming language that has very powerful concurrency functions and resource management capabilities. In Golang, we usually use goroutine to implement concurrent operations, and threads can be regarded as the low-level implementation of goroutine.

In actual development, we often need to manually close threads to release system resources, thereby avoiding resource leaks and unnecessary waste of resources. This article will introduce how to close threads in Golang.

Why do we need to close the thread?

Threads are resources of the operating system. Each thread needs to occupy certain system resources, including memory, CPU, etc. If too many threads are created and not closed in time, system resources will be excessively consumed, leading to system crashes and other problems.

Therefore, in order to ensure the stable operation of the system, we need to manually release unnecessary thread resources to avoid occupying too many system resources. This is also the reason for closing threads.

How to close a thread?

It is relatively simple to close threads in Golang. We can use channels to achieve this. The specific steps are as follows:

1. Create a channel

First we need to create a channel for communication. We can use the make keyword to create a channel:

ch := make(chan bool)

Here we create an unbuffered Boolean channel for passing control information.

2. Listening to channel in goroutine

We need to listen to this channel in goroutine. If the specified message is received, exit the goroutine:

go func() {
    for {
        select {
        case <- ch:
            // 需要关闭的操作
            return
        default:
            // 其他操作
        }
    }
}()

Here we use the select statement to listen to the channel. If a message from the ch channel is received, the internal operations that need to be closed are performed, and return exits the current goroutine.

In addition, we can also add other operations that need to be performed in the default branch, such as some loops, timers, etc.

3. Close goroutine

Finally, we only need to send a message to this channel where the goroutine needs to be closed:

ch <- true

Here we send a message to the channel ch sends a Boolean true value. At this time, the goroutine listening to the channel will receive this value, perform the corresponding operation and exit.

Sample code

The following is a complete sample code to demonstrate how to close a goroutine:

package main

import (
    "fmt"
    "time"
)

func main() {
    ch := make(chan bool)

    go func() {
        for {
            select {
            case <- ch:
                fmt.Println("关闭goroutine...")
                return
            default:
                fmt.Println("运行中...")
                time.Sleep(1 * time.Second)
            }
        }
    }()

    time.Sleep(5 * time.Second)
    ch <- true
    time.Sleep(1 * time.Second)
    fmt.Println("程序结束。")
}

In this code, we first create a channel ch, and then A goroutine is opened, and the select statement is used in the goroutine to monitor the ch channel. When the channel message is received, the corresponding closing operation is performed and the goroutine exits.

In the main function, we sleep for 5 seconds and then send a message to channel ch to close the goroutine. Finally, it sleeps for 1 second and outputs program end information.

Summary

The operation of closing a thread in Golang is relatively simple. You only need to create a channel and use the select statement in the goroutine to listen to this channel. When you need to close the goroutine, you only need to send a shutdown message to the channel. Through the introduction of this article, everyone should be able to better understand the thread closing operation in Golang and apply it to actual development.

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