웹 애플리케이션에서 golang 함수 동시성 제어의 애플리케이션 시나리오

package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "Hello, World!")
    })

    http.ListenAndServe(":8080", nil)
}

package main

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

var wg sync.WaitGroup

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        wg.Add(1)

        go func() {
            defer wg.Done()
            fmt.Fprintf(w, "Hello, World!")
        }()
    })

    http.ListenAndServe(":8080", nil)

    wg.Wait() // 等待所有 Goroutine 完成
}

package main

import (
    "fmt"
)

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

    go func() {
        // 执行耗时的任务
        result := doSomething()

        ch <- result // 将结果发送到通道
    }()

    result := <-ch // 从通道接收结果

    fmt.Printf("耗时任务的结果：%d", result)
}

package main

import (
    "fmt"
    "sync"
)

var pool = sync.Pool{
    New: func() interface{} {
        return &Goroutine{}
    },
}

type Goroutine struct {
    id int
}

func main() {
    for i := 0; i < 10; i++ {
        g := pool.Get().(*Goroutine)
        g.id = i

        go func(g *Goroutine) {
            defer pool.Put(g) // 释放 Goroutine

            // 执行任务
            fmt.Printf("Goroutine ID：%d\n", g.id)
        }(g)
    }

    fmt.Println("所有任务执行完毕")
}