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
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