lkml.org 
[lkml]   [2011]   [Oct]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: lsusd - The Linux SUSpend Daemon
On Fri, 21 Oct 2011, Alan Stern wrote:

> > Maybe we could do something with futexes...
>
> Not easily -- as far as I can tell, futexes enjoy relatively little
> support. In any case, they provide the same service as a mutex, which
> means you'd have to build a shared lock on top of them.

It occurred to me that we could create a new type of special file, one
intended to help with interprocess synchronization. It would support
locking (shared or exclusive, blocking or non-blocking) and the poll
system call -- the file would appear to be ready for reading whenever a
shared lock wouldn't block and ready for writing whenever an exclusive
lock wouldn't block. Actual reads and writes wouldn't have to do
anything, although maybe someone could suggest a use for them.

Alan Stern



\
 
 \ /
  Last update: 2011-10-22 18:35    [W:0.077 / U:1.608 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site