Do Goroutines Launched in HTTP Handlers Always Complete After the Response is Sent?

Goroutine Persistence in HTTP Handler Execution

A common concern arises when initiating goroutines within HTTP handlers: will these routines complete after the response has been returned? To clarify this, let's analyze an example code:

package main

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

func worker() {
    fmt.Println("worker started")
    time.Sleep(time.Second * 10)
    fmt.Println("worker completed")
}

func HomeHandler(w http.ResponseWriter, r *http.Request) {
    go worker()
    w.Write([]byte("Hello, World!"))
}

func main() {
    http.HandleFunc("/home", HomeHandler)
    http.ListenAndServe(":8081", nil)
}

In this example, a worker goroutine is launched within the HomeHandler. Once the response is written, the question persists: will the worker goroutine still complete?

Answer:

Yes, the worker goroutine will complete in all situations.

Goroutines are lightweight threads in Golang. Once initiated, they execute independently and continue running until completion or termination. In the given example, the worker goroutine is launched without any issues that would prevent its completion.

Additional Considerations:

The only situation where goroutines may not complete is when the main function returns, as it signifies the termination of the program. Likewise, extreme circumstances like memory exhaustion can also lead to unstable states and potentially disrupt routine completion. However, these scenarios are highly unlikely in the majority of cases.

The above is the detailed content of Do Goroutines Launched in HTTP Handlers Always Complete After the Response is Sent?. For more information, please follow other related articles on the PHP Chinese website!