Messages in this thread | | | Date | Tue, 13 Feb 2001 14:53:52 -0500 | From | "N. Jason Kleinbub" <> | Subject | Re: Selects on dirs/files. |
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Manfred Spraul wrote:
> "N. Jason Kleinbub" wrote: >> People, >> >> Not sure where to go from here but .... >> >> ( Yes I have read the FAQ )= >> >> For practical reasons, I have created some modification to the >> Linux kernel. These changes were to make our implementation of >> software more convenient (elegant). Essentially, I have modified the >> select() calls to allow the non-trivial use of directories as an 'fd'. >> > Have you checked the F_NOTIFY fcntl()? > > If yes, what's the difference between your patch and F_NOTIFY?
The biggest impediment that I saw with F_NOTIFY was the inability to distinguish _which_ directory generated the signal. This was especially problematic for multithreaded apps. Also I would have a chance of missing the signal if they pile ontop of each other. Everytime I was interupted from my sleep() by a signal I would have to scan _each_ directory to find the next file.
I admit, however, that the current F_NOTIFY has more functionality then the current select().
Plus, for our programmers, it is a stylistic choice. They prefer, and better understand, using select()/poll() versus signal io.
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