From: Roland Dreier <roland@topspin.com>
To: Brandon Corey <bcorey@engr.sgi.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Pollable Semaphores
Date: Fri, 21 Jan 2005 13:37:47 -0800 [thread overview]
Message-ID: <521xceqx90.fsf@topspin.com> (raw)
In-Reply-To: <20050121212212.GA453910@firefly.engr.sgi.com> (Brandon Corey's message of "Fri, 21 Jan 2005 13:22:12 -0800")
Brandon> I'm trying to find out if there is a pollable semaphore
Brandon> equivalent on Linux. The main idea of a "pollable
Brandon> semaphore", is a semaphore with a related file
Brandon> descriptor. The file descriptor can be used to select()
Brandon> when the semaphore is acquirable. This provides a
Brandon> convenient way for users to implement code
Brandon> synchronization between threads, where multiple file
Brandon> descriptors are already being selected against.
Yes, I believe futexes and specifically FUTEX_FD can be used to
implement this. See http://people.redhat.com/~drepper/futex.pdf for
full details.
- Roland
next prev parent reply other threads:[~2005-01-21 21:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-21 21:22 Pollable Semaphores Brandon Corey
2005-01-21 21:37 ` Roland Dreier [this message]
2005-01-21 23:17 ` Brent Casavant
2005-01-22 3:43 ` Ulrich Drepper
2005-01-22 5:52 ` Chris Wright
2005-01-22 7:05 ` Chris Wright
2005-01-22 7:39 ` Ulrich Drepper
2005-01-22 18:02 ` Chris Wright
2005-01-24 20:42 ` Robert White
2005-01-22 0:07 ` Davide Libenzi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=521xceqx90.fsf@topspin.com \
--to=roland@topspin.com \
--cc=bcorey@engr.sgi.com \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.