Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #86089

Re: Design thought for callbacks

Path csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed3a.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path <rosuav@gmail.com>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.045
X-Spam-Evidence '*H*': 0.92; '*S*': 0.01; 'cpython': 0.05; 'detect': 0.07; 'memory.': 0.07; '22,': 0.09; 'callback': 0.09; 'cc:addr :python-list': 0.11; 'blanket': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'wrote:': 0.18; 'work,': 0.20; 'feb': 0.22; 'saying': 0.22; 'cc:addr:python.org': 0.22; 'removed.': 0.24; 'cc:2**0': 0.24; 'header:In-Reply-To:1': 0.27; 'chris': 0.29; 'thus': 0.29; "doesn't": 0.30; 'waste': 0.30; 'message-id:@mail.gmail.com': 0.30; 'along': 0.30; 'alone': 0.33; 'common': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'pm,': 0.38; 'rather': 0.38; 'how': 0.40; 'removing': 0.60; 'such': 0.63; 'prompt': 0.68; 'helping': 0.70; 'subject:Design': 0.78; '2015': 0.84; 'subject:thought': 0.84; 'wipe': 0.84; 'costs,': 0.91; 'why?': 0.91; 'to:none': 0.92
DKIM-Signature v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:cc :content-type; bh=loz/G+RnNZ6/fkigVs9y9AmTd4WoBF0win2tQ6OtOs8=; b=0HcbhKV9Hvlu1kVp5exPEpdF7v3suGCu6jCVVRwka9ODJQRtzOskpUvbKbS7zq8zMR oj1vB+ulRFCtZOdzGbf3YwbNN7mAXnWgvr0H2noLSqksFv0ddVEGJHdX4gPa99HG8TKe brE9jAFkWxUAufDslRauL1nr0vmYRxaGYdZEw3yK0RWk0JjrQ517+LA9FZqACOlhtkOi szKGo/z90wcwTNfKAnmxOI31TU2DXYhcZycmd4M04AknT0LKQbqdj+Wl2E98lSj+Urqy If6oM7tUslyYvfZhcaufFzrZZj92RMT9375Ft/CdGNRt99YA+2vBwvEnAgsJRB9kutTR G16A==
MIME-Version 1.0
X-Received by 10.42.121.203 with SMTP id k11mr622329icr.59.1424595518617; Sun, 22 Feb 2015 00:58:38 -0800 (PST)
In-Reply-To <87mw46ibtq.fsf@elektro.pacujo.net>
References <33677AE8-B2FA-49F9-9304-C8D93784255D@gmail.com> <CAPTjJmpEHQV2PpaZvszuTGn0_GNg0sWV6aLenbQsZrSXCy2YKQ@mail.gmail.com> <mailman.18957.1424524392.18130.python-list@python.org> <mcargl$h3k$1@reader1.panix.com> <87egpjapxv.fsf@elektro.pacujo.net> <54e9391b$0$13010$c3e8da3$5496439d@news.astraweb.com> <87r3tiids7.fsf@elektro.pacujo.net> <mailman.18989.1424593399.18130.python-list@python.org> <87mw46ibtq.fsf@elektro.pacujo.net>
Date Sun, 22 Feb 2015 19:58:38 +1100
Subject Re: Design thought for callbacks
From Chris Angelico <rosuav@gmail.com>
Cc "python-list@python.org" <python-list@python.org>
Content-Type text/plain; charset=UTF-8
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.15
Precedence list
List-Id General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive <http://mail.python.org/pipermail/python-list/>
List-Post <mailto:python-list@python.org>
List-Help <mailto:python-list-request@python.org?subject=help>
List-Subscribe <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups comp.lang.python
Message-ID <mailman.18990.1424595520.18130.python-list@python.org> (permalink)
Lines 17
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1424595520 news.xs4all.nl 2914 [2001:888:2000:d::a6]:34131
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:86089

Show key headers only | View raw

On Sun, Feb 22, 2015 at 7:34 PM, Marko Rauhamaa <marko@pacujo.net> wrote:
> Chris Angelico <rosuav@gmail.com>:
>
>> Or (a very common case for me) a callback saying "remote end is gone"
>> (eg on a socket) might wipe out the callbacks, thus removing their
>> refloops.
>
> Refloops are not to be worried about, let alone removed.

Why? They force the use of the much slower cycle-detecting GC, rather
than the quick and efficient CPython refcounter. I don't know how
other Pythons work, but mark-and-sweep has its own costs, and I don't
know of any system that's both prompt and able to detect refloops.
Helping it along means your program doesn't waste memory. Why such a
blanket statement?

ChrisA

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: Design thought for callbacks Cem Karan <cfkaran2@gmail.com> - 2015-02-21 08:13 -0500
  Re: Design thought for callbacks Grant Edwards <invalid@invalid.invalid> - 2015-02-21 20:57 +0000
    Re: Design thought for callbacks Marko Rauhamaa <marko@pacujo.net> - 2015-02-21 23:57 +0200
      Re: Design thought for callbacks Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-22 13:04 +1100
        Re: Design thought for callbacks Chris Angelico <rosuav@gmail.com> - 2015-02-22 13:11 +1100
          Re: Design thought for callbacks Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-22 15:38 +1100
            Re: Design thought for callbacks Chris Angelico <rosuav@gmail.com> - 2015-02-22 17:21 +1100
              Re: Design thought for callbacks Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-22 21:32 +1100
                Re: Design thought for callbacks Chris Angelico <rosuav@gmail.com> - 2015-02-22 22:14 +1100
                Re: Design thought for callbacks Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-23 00:45 +1100
                Re: Design thought for callbacks Chris Angelico <rosuav@gmail.com> - 2015-02-23 01:01 +1100
        Re: Design thought for callbacks Marko Rauhamaa <marko@pacujo.net> - 2015-02-22 09:52 +0200
          Re: Design thought for callbacks Chris Angelico <rosuav@gmail.com> - 2015-02-22 19:17 +1100
            Re: Design thought for callbacks Marko Rauhamaa <marko@pacujo.net> - 2015-02-22 10:34 +0200
              Re: Design thought for callbacks Chris Angelico <rosuav@gmail.com> - 2015-02-22 19:58 +1100
                Re: Design thought for callbacks Marko Rauhamaa <marko@pacujo.net> - 2015-02-22 11:14 +0200
                Re: Design thought for callbacks Chris Angelico <rosuav@gmail.com> - 2015-02-22 21:21 +1100
                Re: Design thought for callbacks Laura Creighton <lac@openend.se> - 2015-02-22 12:28 +0100
                Re: Design thought for callbacks Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-23 00:57 +1100
                Re: Design thought for callbacks Marko Rauhamaa <marko@pacujo.net> - 2015-02-22 16:06 +0200
    Re: Design thought for callbacks Ian Kelly <ian.g.kelly@gmail.com> - 2015-02-22 00:05 -0700
    Re: Design thought for callbacks Cem Karan <cfkaran2@gmail.com> - 2015-02-22 08:21 -0500
      Re: Design thought for callbacks Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-02-24 18:20 +1300
        Re: Design thought for callbacks random832@fastmail.us - 2015-02-24 00:29 -0500
          Re: Design thought for callbacks Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-02-25 10:19 +1300
            Re: Design thought for callbacks Cem Karan <cfkaran2@gmail.com> - 2015-02-25 07:50 -0500
              Re: Design thought for callbacks Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-02-26 18:36 +1300
                Re: Design thought for callbacks Cem Karan <cfkaran2@gmail.com> - 2015-02-26 05:58 -0500
                Re: Design thought for callbacks Ian Kelly <ian.g.kelly@gmail.com> - 2015-02-26 12:54 -0700
                Re: Design thought for callbacks Ethan Furman <ethan@stoneleaf.us> - 2015-02-26 12:00 -0800
                Re: Design thought for callbacks Cem Karan <cfkaran2@gmail.com> - 2015-03-02 06:06 -0500
                Re: Design thought for callbacks Cem Karan <cfkaran2@gmail.com> - 2015-03-02 06:04 -0500
                Re: Design thought for callbacks Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-02 08:34 -0700
                Re: Design thought for callbacks Cem Karan <cfkaran2@gmail.com> - 2015-03-08 14:30 -0400

csiph-web