From: Linus Torvalds <torvalds@osdl.org>
To: C H Forsyth <forsyth@vitanuova.com>
Cc: 9fans@cse.psu.edu
Subject: Re: [9fans] Re: Threads: Sewing badges of honor onto a Kernel
Date: Fri, 27 Feb 2004 09:43:47 -0800 [thread overview]
Message-ID: <Pine.LNX.4.58.0402270934430.2563@ppc970.osdl.org> (raw)
In-Reply-To: <749601c045a56e4f77835f30907e255b@vitanuova.com>
On Fri, 27 Feb 2004, C H Forsyth wrote:
>
> my impression, and it's only that, is that relatively few user mode
> applications use clone-for-threads at all on Linux, as yet.
No, there's tons of them. But they almost always use the pthreads
interfaces. Few applications use "clone()" directly, since there is seldom
any point to going to that low level.
So libc does a mapping (pretty trivial these days thanks to the new signal
interfaces) of pthreads to clone() and other low-level kernel
functionality.
There's a lot more to threads than just creating them, btw. Linux has a
whole "futex" infrastructure for doing fast user-level mutual exclusion
(which in a pthreads world get mapped to pthread_mutex calls etc). Again,
the kernel interfaces are _not_ the pthreads interfaces (since it would be
crazy to call into the kernel just for a simple lock - 99.99% of the time
you can do it with a simple atomic sequence in user space). But they are
there to support _any_ kind of thread synchronization, whether pthreads-
based or anything else.
Linus
next parent reply other threads:[~2004-02-27 17:43 UTC|newest]
Thread overview: 155+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <749601c045a56e4f77835f30907e255b@vitanuova.com>
2004-02-27 17:43 ` Linus Torvalds [this message]
2004-03-04 6:43 Andrew Simmons
[not found] <f62d09b11d1f097b3f4b5f6b70b65ea5@proxima.alt.za>
2004-03-02 6:55 ` David Tolpin
[not found] <dbcf45ba64ac8a77cd6a3dc6ba63b94b@plan9.escet.urjc.es>
2004-02-27 17:26 ` Linus Torvalds
2004-02-27 23:22 ` boyd, rounin
[not found] <a7ec3985c6aeabd43949005aa6af0f67@collyer.net>
2004-02-27 9:30 ` Linus Torvalds
2004-02-27 8:33 ` boyd, rounin
2004-02-27 9:52 ` Linus Torvalds
2004-02-27 12:14 ` Fco.J.Ballesteros
2004-03-02 4:48 ` Martin C.Atkins
2004-03-02 4:56 ` ron minnich
2004-03-02 9:42 ` Bengt Kleberg
[not found] <20040227081500.14366.qmail@g.galapagos.bx.psu.edu>
2004-02-27 8:58 ` Linus Torvalds
-- strict thread matches above, loose matches on Subject: below --
2004-02-27 4:45 [9fans] " dbailey27
2004-02-27 6:20 ` [9fans] " Linus Torvalds
2004-02-27 6:31 ` dbailey27
2004-02-27 6:49 ` Linus Torvalds
2004-02-27 6:48 ` dbailey27
2004-02-27 7:04 ` Linus Torvalds
2004-02-27 7:06 ` dbailey27
2004-02-27 7:30 ` a
2004-02-27 7:49 ` dbailey27
2004-02-27 7:39 ` Lucio De Re
2004-02-27 7:57 ` Linus Torvalds
2004-02-27 8:00 ` Rob Pike
2004-02-27 8:05 ` Lucio De Re
2004-02-27 8:06 ` boyd, rounin
2004-02-27 7:47 ` Linus Torvalds
2004-02-27 7:46 ` dbailey27
2004-02-27 8:08 ` Linus Torvalds
2004-02-27 8:04 ` dbailey27
2004-02-27 8:19 ` Geoff Collyer
2004-02-27 15:28 ` Rob Pike
2004-02-27 16:57 ` Linus Torvalds
2004-02-27 8:11 ` Lucio De Re
2004-02-27 8:17 ` Rob Pike
2004-02-27 8:31 ` Lucio De Re
2004-02-27 9:46 ` Linus Torvalds
2004-02-27 8:44 ` boyd, rounin
2004-02-27 10:00 ` Linus Torvalds
2004-02-27 9:52 ` Lucio De Re
2004-02-27 10:00 ` Charles Forsyth
2004-02-27 10:07 ` Lucio De Re
2004-02-27 10:14 ` Charles Forsyth
2004-02-27 10:24 ` Lucio De Re
2004-02-27 11:40 ` C H Forsyth
2004-02-28 9:58 ` Bruce Ellis
2004-02-27 10:11 ` Linus Torvalds
2004-02-27 10:13 ` Lucio De Re
2004-02-27 10:36 ` Linus Torvalds
2004-02-27 19:07 ` Donald Brownlee
2004-02-27 7:47 ` Fco.J.Ballesteros
2004-02-27 8:04 ` boyd, rounin
2004-02-29 21:17 ` boyd, rounin
2004-02-27 7:12 ` Rob Pike
2004-02-27 7:17 ` Charles Forsyth
2004-02-27 8:01 ` boyd, rounin
2004-02-27 8:06 ` Scott Schwartz
2004-02-27 8:15 ` Rob Pike
2004-02-27 7:06 ` Lucio De Re
2004-02-27 7:53 ` boyd, rounin
2004-02-27 12:23 ` Dave Lukes
2004-02-27 16:08 ` Linus Torvalds
2004-02-27 16:39 ` Dave Lukes
2004-02-27 17:05 ` Linus Torvalds
2004-02-27 17:03 ` Fco.J.Ballesteros
2004-02-27 17:50 ` Dave Lukes
2004-02-27 18:26 ` Linus Torvalds
2004-02-27 18:27 ` matt
2004-02-27 18:39 ` andrey mirtchovski
2004-02-27 23:39 ` boyd, rounin
2004-03-01 8:44 ` Fco.J.Ballesteros
2004-03-01 8:48 ` Fco.J.Ballesteros
2004-03-01 8:59 ` Lucio De Re
2004-03-01 9:04 ` Fco.J.Ballesteros
2004-03-01 9:16 ` Kenji Okamoto
2004-03-01 9:19 ` Kenji Okamoto
2004-03-01 15:47 ` ron minnich
2004-03-01 16:23 ` lucio
2004-03-01 18:04 ` viro
2004-03-02 9:37 ` Douglas A. Gwyn
2004-03-02 10:16 ` lucio
2004-03-03 1:36 ` Kenji Okamoto
2004-03-02 1:40 ` rob pike, esq.
2004-02-27 23:20 ` boyd, rounin
2004-03-01 10:34 ` Bengt Kleberg
2004-03-01 14:40 ` Russ Cox
2004-03-01 15:17 ` boyd
2004-03-02 9:42 ` Bengt Kleberg
2004-03-02 9:53 ` Fco.J.Ballesteros
2004-03-02 14:51 ` ron minnich
2004-03-03 9:33 ` Bengt Kleberg
2004-03-03 12:59 ` ron minnich
2004-03-03 13:10 ` Fco.J.Ballesteros
2004-03-03 13:21 ` ron minnich
2004-03-04 10:00 ` Yi Li
2004-03-04 11:22 ` Fco.J.Ballesteros
2004-03-05 15:17 ` Yi Li
2004-03-03 13:38 ` rog
2004-03-03 17:57 ` a
2004-03-01 15:56 ` ron minnich
2004-03-02 9:42 ` Bengt Kleberg
2004-02-27 17:32 ` C H Forsyth
2004-02-29 21:10 ` boyd, rounin
2004-03-01 8:19 ` Charles Forsyth
2004-03-01 8:46 ` dbailey27
2004-03-01 9:34 ` David Tolpin
2004-03-01 10:02 ` Charles Forsyth
2004-03-01 10:12 ` David Tolpin
2004-03-01 10:40 ` Charles Forsyth
2004-03-01 11:56 ` David Tolpin
2004-03-01 17:29 ` rog
2004-03-02 6:38 ` 9nut
2004-03-01 19:02 ` Taj Khattra
2004-03-01 19:15 ` David Tolpin
2004-03-01 19:22 ` Joel Salomon
2004-03-01 19:43 ` David Tolpin
2004-03-01 21:07 ` Derek Fawcus
2004-03-01 21:12 ` David Tolpin
2004-03-02 2:46 ` boyd, rounin
2004-03-02 6:02 ` David Tolpin
2004-03-02 12:31 ` Bruce Ellis
2004-03-02 18:46 ` boyd, rounin
2004-03-02 12:19 ` Dick Davies
2004-03-02 18:40 ` boyd, rounin
2004-03-04 3:52 ` Martin C.Atkins
2004-03-04 9:07 ` Bruce Ellis
2004-03-01 21:15 ` Charles Forsyth
2004-03-01 21:20 ` rog
2004-03-02 2:48 ` Joel Salomon
2004-03-03 3:58 ` Martin C.Atkins
2004-03-01 9:36 ` Geoff Collyer
2004-03-01 12:06 ` boyd
2004-03-01 14:55 ` David Presotto
2004-03-01 12:18 ` boyd
2004-03-01 13:29 ` Fco.J.Ballesteros
2004-03-01 13:33 ` lucio
2004-03-01 13:55 ` boyd
2004-03-02 4:13 ` Taj Khattra
2004-03-02 4:34 ` Roman Shaposhnick
2004-03-02 4:47 ` ron minnich
2004-03-02 5:53 ` Roman Shaposhnick
2004-03-02 5:58 ` ron minnich
2004-03-02 15:49 ` boyd, rounin
2004-03-02 7:00 ` rob pike, esq.
2004-03-02 20:58 ` Andrew Simmons
2004-03-02 21:23 ` boyd, rounin
2004-03-03 7:05 ` Anastasopoulos S
2004-03-03 5:11 ` Kenji Okamoto
2004-03-03 5:26 ` boyd, rounin
2004-03-03 9:49 ` Bruce Ellis
2004-03-03 12:41 ` boyd, rounin
2004-03-03 9:42 ` Bruce Ellis
2004-03-03 7:55 ` 9nut
2004-02-27 6:59 ` Donald Brownlee
2004-02-27 7:49 ` boyd, rounin
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