Quick response: Application of Go WaitGroup in high concurrency scenarios

Quick response: The application of Go WaitGroup in high concurrency scenarios requires specific code examples

Introduction:
With the development of Internet technology, high concurrency scenarios Program development is becoming more and more common. In such a scenario, how to optimize program performance and improve response speed has become one of the focuses of developers. As a lightweight concurrent programming language, Go language can effectively optimize program performance by providing rich concurrency primitives. Among them, WaitGroup is a powerful tool in the Go language that can be used to correctly synchronize and wait for the completion of multiple concurrent tasks. This article will introduce the application of Go WaitGroup in high concurrency scenarios and provide specific code examples.

1. Introduction to WaitGroup:
WaitGroup is a concurrent synchronization primitive in the Go language. It is used to wait for the completion of a group of goroutines. In high concurrency scenarios, when we need to wait for multiple concurrent tasks to complete before performing other operations, we can use WaitGroup to achieve this. WaitGroup provides three main methods: Add(), Done() and Wait().

1. Add(n int)Method: Used to add n concurrent tasks to WaitGroup.
2. Done()Method: Called after a goroutine completes the task, reducing the count of WaitGroup.
3. Wait()Method: Used to block the current goroutine until the counter in WaitGroup returns to zero.

2. Application examples:
The following is a sample code based on WaitGroup, showing how to use WaitGroup in high concurrency scenarios to achieve fast response.

package main

import (
    "fmt"
    "sync"
    "time"
)

func main() {
    var wg sync.WaitGroup
    numWorkers := 10 // 并发任务数量

    // 使用Add方法添加任务
    wg.Add(numWorkers)

    for i := 0; i < numWorkers; i++ {
        go worker(i, &wg)
    }

    // 等待所有任务完成
    wg.Wait()
    fmt.Println("All workers have finished.")
}

func worker(id int, wg *sync.WaitGroup) {
    defer wg.Done()

    fmt.Printf("Worker %d started
", id)
    time.Sleep(time.Second) // 模拟任务运行时间
    fmt.Printf("Worker %d finished
", id)
}

In this example, we create 10 concurrent tasks (numWorkers). Add the number of tasks to the WaitGroup by calling the Add() method. In each concurrent task, we simulate specific task execution by calling the worker() function, and then call the Done() method to reduce the WaitGroup count. Finally, call the Wait() method in the main goroutine to wait for all tasks to complete. When all tasks are completed, the program will print out the message "All workers have finished."

In this way, we can effectively wait for the completion of concurrent tasks and improve the response speed of the program.

Conclusion:
In high concurrency scenarios, using the WaitGroup provided by the Go language can very well help us deal with the synchronization and waiting issues of concurrent tasks. By using WaitGroup properly, we can improve the performance and response speed of the program. This article provides a sample code based on WaitGroup to demonstrate its usage in practical applications. It is hoped that readers can understand and master the use of WaitGroup through this sample code, so as to write efficient and optimized programs in high concurrency scenarios.

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