[Haskell-beginners] Re: how to read file with locking

[Jimmy Wylie]

> It is, BTW, always preferable to use withFile over openFile, if you can.
> This makes your code cleaner and also exception-safe.
>
>
>
Hi Ertugrul,

     I don't think I quite understand. How is withFile exception-safe? 
Under the covers it's using openFile. I was under the impression 
withFile was just a nice way to remove boilerplate file operation code.  
Here's what I found on hoogle: "withFile 
<http://haskell.org/hoogle/?hoogle=withFile> name mode act opens a file 
using openFile <http://haskell.org/hoogle/?hoogle=openFile> and passes 
the resulting handle to the computation act. The handle will be closed 
on exit from withFile <http://haskell.org/hoogle/?hoogle=withFile>, 
whether by normal termination or by raising an exception."


Thanks,
Jimmy


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