Re: kevent(2) watching mmap'ed files via EVFILT_VNODE
This is a discussion on Re: kevent(2) watching mmap'ed files via EVFILT_VNODE within the mailing.openbsd.tech forums, part of the OpenBSD category; --> On Mon, Feb 27, 2006 at 05:22:37PM +0100, Srebrenko Sehic wrote: > > using both mmap and read/write on ...
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02-18-2008, 08:21 AM
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 Re: kevent(2) watching mmap'ed files via EVFILT_VNODE On Mon, Feb 27, 2006 at 05:22:37PM +0100, Srebrenko Sehic wrote: > > using both mmap and read/write on the same file is not exactly coherent > > with the current buffer cache design. you can jump the hoops and put > > all kinds of *sync() confettee around but still be not sure. > > In other words, a program A can't be notified via kevent(2) if a > program B changes a mmap'ed file? you may not see data you write(2) thru the mmap(2)ed memory. *sync(2) should help but then you have to design a protocol for msync/fsync cooperation. cu -- paranoic mickey (my employers have changed but, the name has remained)      |
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