On Thu, Apr 13, 2000 at 01:54:26PM +0200, Peter T. Breuer wrote:
> "A month of sundays ago Borislav Deianov wrote:"
> > On Wed, Apr 12, 2000 at 11:51:25PM +0100, Alan Cox wrote:
> > > Why do you want an atomic ps - nobody else has one
> >
> > solves the following problem: there currently is no way to atomically
> > get more than 3K out of /proc, even if it's all in the same file. I
>
> You are mistaken on the latter point. There is no difficulty - once
> you unravel the obscurantist coding. My version of the proconfig patch
> commonly produces 12K of output from /proc/config, for example.
I stand behind my statement that you cannot do this *atomically*. By
this I mean a consistent view of the data, even if it changes while
you are reading it. The reason is that you cannot hold a lock between
calls to the ->read_proc method. You also cannot distinguish between
calls made by different readers (you don't get an unique "struct file"
for each reader like you do with devices).
Of course this is not an issue for /proc/config since the data is
static.
Regards,
Borislav
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