Problem with java.io.File and Multi

Problem with java.io.File and Multi - Threads

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Vishal - 05 Mar 2006 06:54 GMT

Hi everyone,

I am having a problem with the java.io.File.delete() method while
calling my function and running multiple threads within it. I have
written a function which is going to remove a file in a directory. This
function works well when a single thread executes it. But causes
problems in multi-threaded environment. Each thread creates a new
object and calls the removeFiles()
method in its object. Each thread is trying to delete a file in its own
directory, but delete() call seems to work for some of the threads but
fails for others.

Please help..

Thank in advance
vISHAL

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Roedy Green - 05 Mar 2006 07:40 GMT

>removeFiles()

the basic method is called File.delete. What is removeFiles?

Is the problem you are deleting an already deleted file? or one you
have open on another thread?

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Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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Vishal - 07 Mar 2006 04:17 GMT

Hi Roeby,

removeFiles() is user define function name, which is internally calling
File.delete() method only.

No, i am not deleting an already deleted file.

No, each threads has diff files, so there is no questions of locking
and all.

Thanks for your reply.... but i got solution for these issues.

When i called System.gc() before deleting any files then its working
fine for me. I don't know the logical reason but now its working fine
for me. ;)

Thanks,
vISHAL

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Roedy Green - 07 Mar 2006 07:10 GMT

>When i called System.gc() before deleting any files then its working
>fine for me. I don't know the logical reason but now its working fine
>for me. ;)

If you can get this to work in a sample small program, I'm sure sun
would like to see it. I can't think of anything you could
legitimately do that would cause this behaviour. It sounds like
Sun/MS's bug.

Signature

Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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Oliver Wong - 07 Mar 2006 19:20 GMT

> Hi Roeby,
>
[quoted text clipped - 11 lines]
> fine for me. I don't know the logical reason but now its working fine
> for me. ;)

"I don't know why, but it's working now, so let's ignore it" is an okay
strategy for single threaded programs, but can lead to big problems for
multithreaded programs. I advise you to investigate further.

- Oliver

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Problem with java.io.File and Multi - Threads

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