golang closes go thread

Golang is an excellent programming language that is widely used in server-side development, cloud computing, network programming and other fields. The Go language has natural advantages in concurrent programming, and the development of highly concurrent programs can be easily achieved through the Goroutine mechanism. However, in the actual development process, we sometimes need to close the Go thread to avoid wastage of resources and abnormal exit of the program. So, how does Golang close the Go thread?

Goroutine is one of the very important features in the Go language. It refers to a lightweight thread that can be easily created and scheduled in the Go language. Goroutine implements the execution of highly concurrent tasks by using the M:N scheduler (multiple Goroutines corresponding to multiple operating system threads) at the bottom level. This approach simplifies the complexity of thread management and context switching, allowing developers to focus more on writing efficient concurrent programs. However, when the number of Goroutines is too large, it will cause increased pressure on the system, which may lead to resource exhaustion.

In Golang, we can use channels to achieve Goroutine collaboration and synchronization. In addition to transmitting data, channels can also be used to control the life cycle of Goroutine. When we need to close a Goroutine, we can do so by closing the channel. When a channel is closed, calling the channel's receive method immediately returns a zero value, and all subsequent send operations fail. Therefore, in the following code, we can tell the child Goroutine that it should exit by closing the quit channel.

package main

import (
    "fmt"
    "time"
)

func doSomething(quit chan bool) {
    for {
        select {
        case <-quit:
            fmt.Println("quit")
            return
        default:
            fmt.Println("working")
            time.Sleep(time.Second)
        }
    }
}

func main() {
    quit := make(chan bool)
    go doSomething(quit)
    time.Sleep(time.Second * 5)
    close(quit)
    fmt.Println("closed")
    time.Sleep(time.Second * 1)
}

In the above example, we created a function named doSomething, which will always execute an infinite loop. In each loop, the function will check whether it has received a notification to close the channel. If it receives a notification, it will exit the loop directly; if it does not receive a notification, it will continue to execute the work logic. In the main function, we first create a quit channel, execute the doSomething function in the child Goroutine, and wait for 5 seconds. After waiting, we call the close function to close the quit channel and output a log message. Finally, we wait another 1 second to give the child Goroutine time to exit.

Through the above code, we can implement a relatively simple sample program for closing Goroutine. Of course, more factors need to be considered in practical applications, such as how to handle the ongoing business logic in Goroutine, how to avoid resource leaks, and other issues. In general, closing Goroutine is a relatively complex and important operation, which requires careful thinking and practice during the development process.

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