lkml.org 
[lkml]   [1999]   [Feb]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Linux Driver - Select Implementation!
On Fri, Feb 26, 1999 at 02:56:58PM +0000, Alan Cox wrote:
> > When multiple applications issue a select on the same device (driver),
> > Is there any way to notify only one of the application from the driver?
> No. The select specification is quite explicit that everyone sleeping is
> woken

What would the consequences be of a select-like call which had the semantic
that only one of the tasks sleeping for that resource was woken (the
longest-sleeping, perhaps)? (And, probably, all tasks sleeping because
of regular select()) To my naive mind it sounds like a way to avoid
the thundering herd problem. Are there unforseen pitfalls in this, or is
it more a matter of doing something nonstandard, or of the change requiring
widespread kernel changes?

Jeff
--
\/ http://incolor.inetnebr.com/jepler/ Jeff Epler jepler@inetnebr.com
This is a good time to punt work.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:50    [from the cache]
©2003-2011 Jasper Spaans