谷歌去相当于Java finalize方法 [英] google go equivalent of java finalize method

问题描述

有没有像java中的finalize方法在Google中去？如果我有一个像

类型的结构体

  type Foo struct {
f * os.File 
 .. .. 
} 
 
 func（p * Foo）finalize（）{
 pfclose（）
} 
  

如何确保当Object被垃圾收集时，文件已关闭？

解决方案

runtime.SetFinalizer iirc。但它被认为是一件坏事，并不保证在程序退出前运行。编辑：如下所述，当前 os 包已经在文件上调用了 runtime.SetFinalizer 。但是，不应该依赖 SetFinalizer 。举个例子，我有一个类似文件服务器的应用程序，我忘记关闭打开的文件。这个过程通常会在GC收到它们并调用它们的终结器之前打开大约300个文件。

Is there any method like java finalize in google go? If I've a type struct like

    type Foo struct {
        f *os.File
        ....
    }

func (p *Foo) finalize() {
     p.f.close( )           
}

How can I make sure that when Object is garbage collected, the file is closed?

解决方案

runtime.SetFinalizer iirc. But its considered a bad thing and isn't guaranteed to run before program exit

EDIT: As mentioned below, the current os package already calls runtime.SetFinalizer on files. However, SetFinalizer shouldn't be relied upon. As an example of why, I had a file-server-like application where I forgot to close open file. The process would usually get to about 300 open files before the GC picked them up and called their finalizer.

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