Windows中的不稳定行为？

Question

  Update:  The question title can be misleading.  This was not Go's fault at all.
           See the first comment or the accepted answer.

以下代码(好吧,几乎相同)计算Linux下的页面视图,但在Windows下计算它们是双倍的.

有人可以找出原因吗？

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.

这可能是个错误吗？

跟进:

实际上,如果我为另一个页面定义一个额外的处理程序,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,但只有+1:

所以,仍然在Mingw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:

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.

Answer 1

我怀疑你看到的行为是由于浏览器为你的页面请求了一个favicon,而不是由于Windows/mingw.如果你想知道,我正在使用6g ond Darwin,我的Firefox 3.6也在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.从刚刚启动的Firefox到URL http:// localhost:8080/chuchichaestli的一个请求产生以下输出:

Counting chuchichaestli, 1 so far.
Counting favicon.ico, 2 so far.

因为Firefox还会为你的go页面请求favicon.

此外,views即使可能存在多个并发请求,您也不会锁定/同步访问权限.