Windows中的行为不稳定?

 Update:  The question title can be misleading.  This was not Go's fault at all.

           See the first comment or the accepted answer.

下面的代码(几乎相同)在Linux下可以计算页面浏览量,但在Windows下可以将页面浏览量提高一倍。


有人能弄清楚为什么吗?


package main


import (

 "fmt"

    "http"

)


func main() {

    println("Running")

    http.HandleFunc("/", makeHomeHandler())

 http.ListenAndServe(":8080", nil)

}


// this version compiles and run OK under the Linux version of Golang

func makeHomeHandler() func(c *http.Conn, r *http.Request) {

    views := 1

    return func(c *http.Conn, r *http.Request) {

     fmt.Fprintf(c, "Counting %s, %d so far.", r.URL.Path[1:], views)

        views++

    }

}


/*

// this version compiles and run OK under the mingw version of Golang

// it uses a different argument type for the handler function,

// but the counter says "1 so far", then "3 so far", "5 so far", and so on.

func makeHomeHandler() func(c http.ResponseWriter, r *http.Request) {

    views := 1

    return func(c http.ResponseWriter, r *http.Request) {

     fmt.Fprintf(c, "Counting %s, %d so far.", r.URL.Path[1:], views)

        views++

    }

}

*/

在Mingw下:


http://localhost:8080/monkeys => Counting monkeys, 1 so far.

http://localhost:8080/monkeys => Counting monkeys, 3 so far.

http://localhost:8080/donkeys => Counting donkeys, 5 so far.

这可能是错误吗?


跟进:


实际上,如果我为另一个页面定义了另一个处理程序,例如:


   http.HandleFunc("/test", testPageHandler)

Wich没有闭包,也没有增加任何东西,计数器无论如何都会增加,但是只有+1:


因此,仍然在Mingw的领导下:


http://localhost:8080/monkeys => Counting monkeys, 1 so far.

http://localhost:8080/monkeys => Counting monkeys, 3 so far.

http://localhost:8080/test   => Another handler function that does not increment "views"

http://localhost:8080/donkeys => Counting donkeys, 6 so far.

在Linux下,输出如下所示:


http://localhost:8080/monkeys => Counting monkeys, 1 so far.

http://localhost:8080/monkeys => Counting monkeys, 2 so far.

http://localhost:8080/test   => Another handler function that does not increment "views"

http://localhost:8080/donkeys => Counting donkeys, 3 so far.


暮色呼如
浏览 228回答 1
1回答

有只小跳蛙

我怀疑您看到的行为是由于浏览器为您的页面请求图标,而不是由于Windows / mingw。如果您想知道,我在达尔文使用6g,我的Firefox 3.6也可以在Mac OS X上运行。为了强调我的怀疑,请尝试将以下内容添加到处理程序函数中:fmt.Printf("Counting %s, %d so far.\n", r.URL.Path[1:], views)然后,您可以看到所有到达您的应用程序的请求。从新启动的Firefox到URL http:// localhost:8080 / chuchichaestli的一个请求将产生以下输出:Counting chuchichaestli, 1 so far.Counting favicon.ico, 2 so far.因为Firefox还会为您的go页面请求图标。此外,views即使可能存在多个并发请求,您也不会锁定/同步访问。
打开App,查看更多内容
随时随地看视频慕课网APP

相关分类

Go