From: dexen deVries <dexen.devries@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] Modern development language for Plan 9, WAS: Re: RESOLVED: recoving important header file rudely
Date: Fri, 18 Feb 2011 14:45:41 +0100 [thread overview]
Message-ID: <201102181445.41877.dexen.devries@gmail.com> (raw)
In-Reply-To: <a1f88029ea19f89d14b8f7f3ae942b54@ladd.quanstro.net>
On Friday, February 18, 2011 02:29:54 pm erik quanstrom wrote:
> so this is a complete waste of time if forks > getpids.
> and THREAD_GETMEM must allocate memory. so
> the first call isn't exactly cheep. aren't they optimizing
> for bad programming?
>
> not only that, ... from getpid(2)
>
> NOTES
> Since glibc version 2.3.4, the glibc wrapper function for
> getpid() caches PIDs, so as to avoid additional system calls when a
> process calls getpid() repeatedly. Normally this caching is invisible,
> but its correct operation relies on support in the wrapper
> functions for fork(2), vfork(2), and clone(2): if an application bypasses
> the glibc wrappers for these system calls by using syscall(2), then a
> call to getpid() in the child will return the wrong value (to be
> precise: it will return the PID of the parent process). See also
> clone(2) for dis-
which boggles my mind: why would getpid() need to be optimized for in the first
place?
Konqueror 4.5.5 (browser) calls it once per short session (few tabs)
Firefox 4 (browser) calls it about once per tab
openssh calls it once or twice per session
bash calls it once
lsof, find do not call it at all.
what does call getpid() often? @_@
anyway, it looks a bit like library lock-in to me: ``your app better perform
_every_ syscall through glibc, or else'' -- or else strange things may happen,
eh?
--
dexen deVries
[[[↓][→]]]
> how does a C compiler get to be that big? what is all that code doing?
iterators, string objects, and a full set of C macros that ensure
boundary conditions and improve interfaces.
ron minnich, in response to Charles Forsyth
http://9fans.net/archive/2011/02/90
next prev parent reply other threads:[~2011-02-18 13:45 UTC|newest]
Thread overview: 192+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-29 22:47 [9fans] HELP: recoving important header file rudely clobbered by mk smiley
2011-01-29 22:54 ` erik quanstrom
2011-01-29 22:58 ` Steve Simon
2011-01-30 1:16 ` smiley
2011-01-30 4:07 ` John Floren
2011-01-30 4:49 ` erik quanstrom
2011-01-30 4:56 ` John Floren
2011-02-01 6:22 ` smiley
2011-02-01 6:47 ` Federico G. Benavento
2011-02-01 6:54 ` John Floren
2011-01-29 23:24 ` [9fans] RESOLVED: " smiley
2011-01-29 23:41 ` Steve Simon
2011-01-30 14:19 ` [9fans] RESOLVED: recoving important header file rudely Richard Miller
2011-01-30 14:28 ` erik quanstrom
2011-01-31 18:02 ` smiley
2011-01-31 22:12 ` Steve Simon
2011-02-01 6:02 ` smiley
2011-02-01 6:26 ` Lucio De Re
2011-02-01 7:07 ` smiley
2011-02-01 7:22 ` Lucio De Re
2011-02-01 13:45 ` erik quanstrom
2011-02-01 16:24 ` Charles Forsyth
2011-02-01 6:45 ` ron minnich
2011-02-01 17:51 ` smiley
2011-02-01 18:33 ` ron minnich
2011-02-01 19:16 ` jimmy frasche
2011-02-02 0:28 ` smiley
2011-02-02 0:42 ` erik quanstrom
2011-02-02 0:47 ` ron minnich
2011-02-02 5:14 ` [9fans] Modern development language for Plan 9, WAS: " smiley
2011-02-02 5:37 ` Scott Sullivan
2011-02-02 5:38 ` EBo
2011-02-02 15:54 ` Anthony Sorace
2011-02-02 12:54 ` erik quanstrom
2011-02-02 13:48 ` Devon H. O'Dell
2011-02-02 17:47 ` David Leimbach
2011-02-02 17:53 ` erik quanstrom
2011-02-02 18:07 ` tlaronde
2011-02-02 18:26 ` David Leimbach
2011-02-02 18:48 ` tlaronde
2011-02-02 19:26 ` Nick LaForge
2011-02-03 0:39 ` Charles Forsyth
2011-02-02 17:44 ` David Leimbach
2011-02-02 17:50 ` erik quanstrom
2011-02-02 18:15 ` Jonathan Cast
2011-02-02 18:21 ` erik quanstrom
2011-02-02 18:36 ` David Leimbach
2011-02-02 18:38 ` erik quanstrom
2011-02-02 18:46 ` David Leimbach
2011-02-02 19:15 ` Jonathan Cast
2011-02-02 19:31 ` erik quanstrom
2011-02-02 19:48 ` Jeff Sickel
2011-02-02 20:07 ` Jonathan Cast
2011-02-02 20:11 ` erik quanstrom
2011-02-02 20:22 ` Jonathan Cast
2011-02-02 18:21 ` David Leimbach
2011-02-03 10:00 ` [9fans] Modern development language for Plan 9, Greg Comeau
2011-02-02 18:03 ` [9fans] Modern development language for Plan 9, WAS: Re: RESOLVED: recoving important header file rudely erik quanstrom
2011-02-02 18:30 ` David Leimbach
2011-02-18 5:23 ` ron minnich
2011-02-18 5:34 ` Paul Lalonde
2011-02-18 13:29 ` erik quanstrom
2011-02-18 13:45 ` dexen deVries [this message]
2011-02-18 14:54 ` David Leimbach
2011-02-18 15:15 ` Devon H. O'Dell
2011-02-18 16:11 ` erik quanstrom
2011-02-18 16:28 ` Devon H. O'Dell
2011-02-18 16:49 ` erik quanstrom
2011-02-18 17:10 ` Devon H. O'Dell
2011-02-18 17:32 ` erik quanstrom
2011-02-18 17:44 ` ron minnich
2011-02-18 19:28 ` Devon H. O'Dell
2011-02-18 19:33 ` erik quanstrom
2011-02-18 19:49 ` Devon H. O'Dell
2011-02-18 18:43 ` Joseph Stewart
2011-02-18 17:05 ` andrey mirtchovski
2011-02-18 17:12 ` Devon H. O'Dell
2011-02-18 16:53 ` dexen deVries
2011-02-18 16:59 ` Devon H. O'Dell
2011-02-18 17:07 ` erik quanstrom
2011-02-18 17:11 ` Devon H. O'Dell
2011-02-18 17:21 ` erik quanstrom
2011-02-18 17:52 ` John Floren
2011-02-18 18:46 ` Rob Pike
2011-02-18 19:15 ` Bakul Shah
2011-02-18 19:26 ` erik quanstrom
2011-02-18 19:46 ` Bakul Shah
2011-02-18 20:15 ` erik quanstrom
2011-02-18 21:06 ` John Floren
2011-02-18 22:21 ` Bakul Shah
2011-02-18 23:39 ` [9fans] Modern development language for Plan 9, Lyndon Nerenberg (VE6BBM/VE7TFX)
2011-02-19 10:26 ` [9fans] Modern development language for Plan 9, WAS: Re: RESOLVED: recoving important header file rudely Steve Simon
2011-02-19 15:09 ` erik quanstrom
2011-02-19 20:09 ` Bakul Shah
2011-02-19 21:15 ` erik quanstrom
2011-02-20 23:49 ` Bakul Shah
2011-02-21 14:47 ` erik quanstrom
2011-02-19 16:57 ` Skip Tavakkolian
2011-02-19 15:36 ` erik quanstrom
2011-02-24 10:09 ` [9fans] Modern development language for Plan 9, Greg Comeau
2011-02-18 19:35 ` [9fans] Modern development language for Plan 9, WAS: Re: RESOLVED: recoving important header file rudely David Leimbach
2011-02-18 20:10 ` Bakul Shah
2011-02-18 21:03 ` ron minnich
2011-02-18 23:55 ` Federico G. Benavento
2011-02-24 10:09 ` [9fans] Modern development language for Plan 9, Greg Comeau
2011-02-18 19:15 ` [9fans] Modern development language for Plan 9, WAS: Re: RESOLVED: recoving important header file rudely Devon H. O'Dell
2011-02-21 5:08 ` smiley
2011-02-18 17:16 ` Russ Cox
2011-02-18 17:12 ` andrey mirtchovski
2011-02-19 10:34 ` Steve Simon
2011-02-19 17:25 ` dexen deVries
2011-02-02 4:19 ` [9fans] " Federico G. Benavento
2011-02-02 19:15 ` smiley
2011-02-02 21:47 ` ron minnich
2011-02-03 3:35 ` smiley
2011-02-03 4:32 ` andrey mirtchovski
2011-02-03 6:15 ` Lucio De Re
2011-02-03 7:54 ` dexen deVries
2011-02-03 9:48 ` Charles Forsyth
2011-02-03 13:01 ` erik quanstrom
2011-02-03 13:40 ` roger peppe
2011-02-03 13:59 ` erik quanstrom
2011-02-03 14:16 ` roger peppe
2011-02-03 14:17 ` erik quanstrom
2011-02-03 14:24 ` roger peppe
2011-02-03 14:38 ` Charles Forsyth
2011-02-03 18:45 ` Skip Tavakkolian
2011-02-03 16:23 ` Noah Evans
2011-02-01 8:25 ` Federico G. Benavento
2011-02-01 8:37 ` Akshat Kumar
2011-02-01 9:02 ` Federico G. Benavento
2011-02-01 14:11 ` erik quanstrom
[not found] ` <AANLkTimYW2wofCNn1WB09cTVrQ69QxjPMZqY=Qrri5Xi@mail.gmail.com>
[not found] ` <AANLkTikM+LcEzaHMjWoSGubNnzXx-5h_bprQcJsrGnnG@mail.gmail.com>
[not found] ` <AANLkTim4mPBHv8R=2XwdWaBc_aPHyRjj_CbdkgC8KZbd@mail.gmail.com>
[not found] ` <AANLkTi=9HkdLfNLFWxddDkHWC8w_uWKPEnWQ4r2gD7an@mail.gmail.com>
[not found] ` <AANLkTikjYkyW75PLm8z65=1+gTLUZLxG-xcN9wkQVuPr@mail.gmail.com>
[not found] ` <AANLkTimLMLsWWQtVPZwGb0qwFxjbpy05qVZHDv92LfYY@mail.gmail.com>
[not found] ` <AANLkTimoXQLMpciQh_tLRfS5ht8ONFvqz2QXEC0td2G4@mail.gmail.com>
[not found] ` <AANLkTimDXcriCuejuYZ2OixXVjoYckB-hcy9+FkMsjcS@mail.gmail.com>
[not found] ` <AANLkTikmQuhyXh6qhgM4hgWK2N-EhebLkWtpf9OnUkx1@mail.gmail.com>
2011-02-01 17:20 ` Jacob Todd
2011-02-01 6:54 ` [9fans] HELP: recoving important header file rudely clobbered by mk ron minnich
2011-02-01 14:49 ` erik quanstrom
2011-02-01 14:58 ` Eric Van Hensbergen
2011-02-01 15:18 ` erik quanstrom
2011-02-01 15:37 ` Eric Van Hensbergen
2011-02-01 15:45 ` erik quanstrom
2011-02-01 16:31 ` Eric Van Hensbergen
2011-02-01 16:45 ` erik quanstrom
2011-02-01 16:59 ` ron minnich
2011-02-02 3:46 ` Federico G. Benavento
2011-02-01 16:41 ` ron minnich
2011-02-01 16:25 ` Charles Forsyth
2011-02-01 7:01 ` Federico G. Benavento
2011-02-02 19:05 ` smiley
2011-02-03 10:16 ` [9fans] HELP: recoving important header file rudely clobbered Richard Miller
2011-02-03 10:24 ` dexen deVries
2011-02-03 10:27 ` dexen deVries
2011-02-03 10:23 ` Richard Miller
2011-02-03 10:37 ` roger peppe
2011-02-03 10:48 ` Lucio De Re
2011-02-02 6:56 [9fans] Modern development language for Plan 9, WAS: Re: RESOLVED: recoving important header file rudely Jacob Todd
2011-02-02 7:06 ` ron minnich
2011-02-02 7:25 ` Bakul Shah
2011-02-02 7:25 ` Lucio De Re
2011-02-02 7:35 ` Nick LaForge
2011-02-02 17:45 ` David Leimbach
2011-02-02 19:19 ` Bakul Shah
2011-02-03 0:30 ` Charles Forsyth
2011-02-03 0:21 ` erik quanstrom
2011-02-03 0:52 ` Charles Forsyth
2011-02-03 0:50 ` ron minnich
2011-02-03 2:16 ` Bakul Shah
2011-02-03 2:25 ` David Leimbach
2011-02-03 2:26 ` erik quanstrom
2011-02-03 15:08 ` David Leimbach
2011-02-03 16:19 ` Eugene Gorodinsky
2011-02-03 17:41 ` Bakul Shah
2011-02-03 18:11 ` erik quanstrom
2011-02-03 18:33 ` Bakul Shah
2011-02-03 18:54 ` erik quanstrom
2011-02-03 19:40 ` Bakul Shah
2011-02-03 20:33 ` erik quanstrom
2011-02-04 7:16 ` Bakul Shah
2011-02-04 14:38 ` erik quanstrom
2011-02-03 18:29 ` Joseph Stewart
2011-02-03 8:35 ` Charles Forsyth
2011-02-03 8:56 ` EBo
2011-02-03 9:46 ` Charles Forsyth
2011-02-03 9:47 ` EBo
2011-02-03 9:50 ` Lucio De Re
2011-02-03 10:38 ` C H Forsyth
2011-02-03 12:07 ` EBo
2011-02-03 20:49 ` Federico G. Benavento
2011-02-03 21:07 ` ron minnich
2011-02-03 21:32 ` Steve Simon
2011-02-03 23:19 ` EBo
2011-02-03 18:21 ` smiley
2011-02-03 18:50 ` John Floren
2011-02-04 5:54 ` andrey mirtchovski
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=201102181445.41877.dexen.devries@gmail.com \
--to=dexen.devries@gmail.com \
--cc=9fans@9fans.net \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).