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リファレンスの循環参照によるメモリリークを Scalar::Util::weaken で解決する - naoyaのはてなダイアリー
Perl のガベージコレクション(GC)の実装にはリファレンスカウント方式のGCが採用されています。リファレンスカウントというのは、あるデータ構造やオブジェクトがあった際、それらを参照するリファレンスの数を内部で換算して、その数が 0 になったらメモリから実体を破棄するという仕組みです。(JavaやRubyなどの他言語のGC方式については 'Perl、Java、Ruby における GC アルゴリズム' あたりを。) リファレンスカウント式GCは、仕組みがシンプルで分かりやすい利点を持つ反面、相互参照が原因で参照を切ることができずにオブジェクトが解放されず、結果メモリリークを引き起す場合があるという欠点も持っています。 このメモリリークはバッチスクリプトや CGI のように、一度の実行で Perl のプロセスそのものが終了するプログラムではあまり問題になりませんが、デーモンプログラム、あるい
Why I Stuck With Perl | Ocean of Awareness [blogs.perl.org]
Jeffrey Kegler's tech blog. Topics include his Marpa parser and parsing in general. I've just read a very thoughtful description of why one Perl programmer switched to Python. In this blog post, I'll explain why I did not. When I started on the Marpa project, Perl was not an automatic choice. In fact it looked like it might be the wrong one. There was as much buzz for Python then as now. Maybe mor
given/when – the Perl switch statement
Its been a while since my last post; summer holidays have inflicted upon me some big distractions! So to ease myself back in gently I’ll I’ve pulled out a (nearly finished but unposted) article from last year (in true Blue Peter tradition!) This post was inspired by this nice & straightforward blog article: How A Ruby Case Statement Works And What You Can Do With It. I’ve simply converted the Ruby
Why You Can't Hire Great Perl Programmers - Modern Perl Programming
If this is your first visit to my site, welcome. I've written a book called Modern Perl which explains how Perl 5 works and how to program Perl effectively. Electronic versions are free to download and redistribute, and print versions are for sale. I hope the book is useful to you; please tell other people about it. If you're an employer or recruiter looking for good Perl developers, the whitepape
Cool Tools To Know « Laufeyjarson writes…
chromatic mentioned something in the preface to his book Modern Perl that I had been looking for but hadn’t yet found. He then went on to mention a couple of other things which were just plain neat. I knew about one of them, but not the second and thought they were both great ideas and thought I’d try and get them wider attention. I’d been looking for a way to manage having multiple Perl install
Impatient Perl (free) - www.perl.org
You write code for a living, and your inherit a legacy program written in Perl. You can program in your native language in your sleep. But you don't know Perl at all, or you've only dabbled with it. Your deadline doesn't give you enough time to rewrite the legacy program in your native language, but it needs new features. You need to learn Perl, and you need to learn it NOW. "Impatient Perl" was w
Ugly Old Perl « Laufeyjarson writes…
I work as a professional Perl developer. We have a large and complex system which is built around a lot of Perl. This system has been in use and in place for years, and handles an astonishing amount of load, using thousands of computers to do it. I work with some excellent engineers, who are thoughtful, intelligent, hard-working folks. They want to make the best system they can, and they want i
Hacking Thy Fearful Symmetry
playing on the other channel: Hellcatalyst My dragon has been a participant of NaNoWriMo -- the National Novel Writing Month -- for several years. A long, long time ago I wrote a small graphing web application for her and her friends to keep track of their word count throughout the month. It was built using AxKit and to say that this application was getting long in the tooth would be, aah..., kin
Dancer - lightweight yet powerful web application framework - metacpan.org
NAME Dancer - lightweight yet powerful web application framework VERSION version 1.3521 SYNOPSIS #!/usr/bin/perl use Dancer; get '/hello/:name' => sub { return "Why, hello there " . param('name'); }; dance; The above is a basic but functional web app created with Dancer. If you want to see more examples and get up and running quickly, check out the Dancer::Introduction and the Dancer::Cookbook. Fo
Patch, Publish or Paw. - Human cats are programmers
Closure: a first-class function with free variables that are bound in the lexical environment. When you get closure with a "significant other" they usually go away, When you get closure with a lexical, they stick around... Even after you'd normally expect them to be dead! What a closure is, what it does, and why you care. Closures keep lexical variables alive as in order for them to be available t
Writing serious Perl: The absolute minimum you need to know
Abstract Perl's extremely flexible syntax makes it easy to write code that is harder to read and maintain than it could be. This article describes some very basic practices I consider necessary for a clear and concise style of writing Perl. Table of contents Namespaces Rooting a namespace Exporting symbols Instant data structures Classes and objects Constructors Multiple constructors Instance meth
recursive blocking wait detected への対処 - Pixel Pedals of Tomakomai
連休の非同期祭も(疲れたので)これでラストです。 AnyEvent(5.2)でこんなコード書くと、「recursive blocking wait detected」が出ます。 use strict; use warnings; use AnyEvent; sub main { foreach my $i (1 .. 5) { my $cv = AE::cv; my $t = AE::timer $i, 0, sub { $cv->send($i); }; print $cv->recv, "\n"; } } my $t = AE::timer 0, 0, \&main; AE::cv->recv; # 結果 # EV: error in callback (ignoring): AnyEvent::CondVar: recursive blocking wait detected at
01日目: プロジェクトを始める
はじめに このチュートリアルでは Advent Calendar の形式を借りて24日間にわたって Ark をつかったウェブアプリケーションの開発方法について説明します。 各章は約1時間ほどで終わる程度であり、実際のWebサイトを最初から最後までコーディングすることで Ark を学習します。 1日1時間24日で合計1日になります。これは Ark の基本を学ぶために必要な時間であると私たちは考えています。毎日、新しい機能がアプリケーションに追加され、Ark の Web 開発のベストプラクティスと同時に新しい機能を紹介するためにこの開発プロセスを利用します。 24日間で作成するアプリケーションの名前は Jobeet です。これは PHP のフレームワークである symfony のチュートリアルと同じです。このチュートリアルでは同じアプリケーションを Ark を使用して作成していきます。 今日は
第4回 Any::Moose：なにがどうでもムースはムース | gihyo.jp
CPANTSは情報の宝庫 Perlを使う最大の利点といわれるCPANですが、CPANは単なるモジュール置き場ではありません。CPANはまたPerlの利用状況を知るうえで不可欠な統計情報を得る場でもあります。そのような統計情報のいくつかは、いわゆるCPAN検索サイトからも確認できますが、より突っ込んだ情報が欲しい場合はCPANTS（CPAN Testing Service）と呼ばれるサイトを確認するのが便利です。 国内ではnipotanこと谷口公一氏が始めた「輝け！全日本最強 CPAN Author 決定選手権」のネタ元として知られていますが、このサイトでは個々の作者やモジュールの品質だけでなく、そのモジュールが実際にどこで使われているかという情報を得ることもできます。 たとえば前回取り上げたロール関連のモジュールの利用状況を調べてみると、古き良きExporterを依存モジュールとして取り上
boolean calculation with very large data
llancet has asked for the wisdom of the Perl Monks concerning the following question: In an recent work, I have to compare two splitted regions, and found the intersection (or substraction, etc) of it. To achieve this, I used string masking system like below: my $region1=[[1,2],[5,7]]; my $region2=[[2,6]]; my $mask1=&toMask($region1); # 1100111 my $mask2=&toMask($region2); # 0111110 my $mask3=&mas
LWPx::ParanoidAgent - subclass of LWP::UserAgent that protects you from harm - metacpan.org
NAME LWPx::ParanoidAgent - subclass of LWP::UserAgent that protects you from harm SYNOPSIS require LWPx::ParanoidAgent; my $ua = LWPx::ParanoidAgent->new; # this is 10 seconds overall, from start to finish. not just between # socket reads. and it includes all redirects. so attackers telling # you to download from a malicious tarpit webserver can only stall # you for $n seconds $ua->timeout(10); #
python-to-perl-conversions.txt
Subject: Python to Perl Conversions From: tchrist@mox.perl.com (Tom Christiansen) Date: 19 Aug 1999 08:21:55 -0700 To: python-list@mail.python.org Per your collective requests, here is one of the documents with my collective observations from learning Python. Some have mentioned that I've left things out that are in more recent releases. I'm sorry, but I only have Mark Lutz's book to go on. There
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JPerl Advent Calendar 2009
Web Reference - Code Documentation, Tutorials, and Demos