Re: [fuse-devel] global variables

[David S. <dav...@gm...>]

On 3/26/07, Gergely Debreczeni <Ger...@ce...> wrote:
> Hi Miklos !
>
>  In general , if I have a global variable defined and
> some of my function (ex. my_write, my_open) performs operations on it,
> modifies it,
> can that cause trouble somehow ?
>
>  Or fuse handles all the locking automatically to be thread safe ?
>
>  Is there any case when the user defined functions (_open, _close, etc)
> are calles paralelly ?

Hi, Gergely. I recently had the same question. The thread is here:

--> http://thread.gmane.org/gmane.comp.file-systems.fuse.devel/4271

The short answer is: if you're writing a single-threaded filesystem
(which could have severe performance implications), then you can store
info in global variables. If you're writing a multithreaded
filesystem, then you need to manage your own thread-local storage to
avoid corruption.

David