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• Lock Free Queue -- Single Producer, Multiple Consumers

  - by Shirish

  Hello, I am looking for a method to implement lock-free queue data structure that supports single producer, and multiple consumers. I have looked at the classic method by Maged Michael and Michael Scott (1996) but their version uses linked lists. I would like an implementation that makes use of bounded circular buffer. Something that uses atomic variables? On a side note, I am not sure why these classic methods are designed for linked lists that require a lot of dynamic memory management. In a multi-threaded program, all memory management routines are serialized. Aren't we defeating the benefits of lock-free methods by using them in conjunction with dynamic data structures? I am trying to code this in C/C++ using pthread library on a Intel 64-bit architecture. Thank you, Shirish

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• Setting borders around tbody, thead and tfoot with IE8

  - by Benjamin

  Hi, I've designed a table in html that uses tbody, tfoot and thead. I would like to put a border-bottom and border-top on my tbody. Which works perfectly well with Firefox and Google Chrome. However Internet Explorer 8 does not display the borders at all. After searching on the internet I haven't found any solution that did not involve some javascript; which I am not keen on using for that task. Has anyone faced this problem before and came up with a solution that does not require javascript? Ideally I wouldn't want to start messing around with the html too much, a solution just with css would be awesome. Thanks for that.

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• Running another ruby script from a ruby script

  - by Andrew Grimm

  In ruby, is it possible to specify to call another ruby script using the same ruby interpreter as the original script is being run by? For example, if a.rb runs b.rb a couple of times, is it possible to replace system("ruby", "b.rb", "foo", "bar") with something like run_ruby("b.rb", "foo", "bar") so that if you used ruby1.9.1 a.rb on the original, ruby1.9.1 would be used on b.rb, but if you just used ruby a.rb on the original, ruby would be used on b.rb? I'd prefer not to use shebangs, as I'd like it to be able to run on different computers, some of which don't have /usr/bin/env. Edit: I didn't mean load or require and the like, but spawning new processes (so I can use multiple CPUs).

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• How to play sound in Python WITHOUT interrupting music/other sounds from playing

  - by Morlock

  I'm working on a timer in python which sounds a chime when the waiting time is over. I use the following code: from wave import open as wave_open from ossaudiodev import open as oss_open def _play_chime(): """ Play a sound file once. """ sound_file = wave_open('chime.wav','rb') (nc,sw,fr,nf,comptype, compname) = sound_file.getparams( ) dsp = oss_open('/dev/dsp','w') try: from ossaudiodev import AFMT_S16_NE except ImportError: if byteorder == "little": AFMT_S16_NE = ossaudiodev.AFMT_S16_LE else: AFMT_S16_NE = ossaudiodev.AFMT_S16_BE dsp.setparameters(AFMT_S16_NE, nc, fr) data = sound_file.readframes(nf) sound_file.close() dsp.write(data) dsp.close() It works pretty good, unless any other device is already outputing sound. How could I do basically the same (under linux) without having the prerequisite that no sound is being played? If you think the process would require an API to ensure software mixing, please suggest a method :) Thx for the support

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• Timed email reminder in python

  - by Ali

  I have written up a python script that allows a user to input a message, his email and the time and they would like the email sent. This is all stored in a mysql database. However, how do I get the script to execute on the said time and date? will it require a cron job? I mean say at 2:15 on april 20th, the script will search the database for all times of 2:15, and send out those emails. But what about for emails at 2:16? I am using a shared hosting provided, so cant have a continously running script. Thanks

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• Signing in to Twitter from iPhone - is the cake poisoned?

  - by Tristan

  Hi there, I'm using MGTwitterEngine to add Twitter functionality to my app. It's very easy to simply prompt the user for a username and password and then start posting. Strangely, however, I've noticed other apps (eg Foursquare and Brightkite) require you to visit their website to associate your Twitter account with your foursquare/brightkite/whatever account. Why do they do it this way? Is there a reason why my app shouldn't prompt the user for a Twitter username and password, even though it would be so easy? Thanks a bunch! Tristan

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• Facebook API - Get comments

  - by Simon R

  Our business has a Facebook Fan Page. The fan page doesn't seem to generate any emails to us when updates are made to the page, whether someone adds a new status or someone comments on one of the statuses etc. Currently, we are running a very crude script to grab the content of the page and then use regular expressions to get the information we require. Obviously this is not fool proof and I'm looking into alternatives to this method. I've been looking at the facebook API and wonder if the rest server might be an option. I cannot, however, seem to find out how to return information of fan page statuses and their comments. Is anyone able to direct me how to use the API to retrieve this information. I am an admin of the fan page. The programming language I'm using is PHP. Many thanks.

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• How prevalent is the use of Emacs' eshell in multi-platform development?

  - by pajato0

  I've only recently become aware of Emacs' eshell tool. It looks quite powerful in that it is entirely written in Emacs Lisp and does not require native subshell support. The Emacs info documentation is a bit sparse but EmacsWiki has pretty decent information, at least on a first glance. Given the potential value of eshell as a scripting tool/programmer's aid that works equally well on multiple platforms I'm wondering how prevalent the use of eshell versus the normal (bash) shell is among software developers. Would those of you who have taken the time to learn it recommend it or is it one of those many interesting ideas that did not really pan out?

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• Graph databases and Php

  - by stagas

  I want to use a graph database using php. Can you point out some resources on where to get started? Is there any example code / tutorial out there? Or are there any other methods of storing data that relate to each other in totally random/abstract situations? Very abstract example of the relations needed: John relates to Mary, both relate to School, John is Tall, Mary is Short, John has Blue Eyes, Mary has Green Eyes, query I want is which people are related to 'Short people that have Green Eyes and go to School' - answer John It is possible in MySQL but it would require a fixed set of attributes/columns for each item and a complex non-flexible query, instead I need every attribute to be an item by itself and instead of 'belonging' to something, to be 'related' to something.

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• Drupal Filefield won't upload javascript files?

  - by hfidgen

  Hiya, I've got a site where individual pages might require some javascript or CSS files hooked into their heads. I'm trying to keep everything client side when it comes to managing this process, rather than getting on the FTP and sorting everything out in the code so I need to be able to upload css and js files. I've got CCK filefield up and running, and it works with css files, but it refuses to upload .js files. It instead seems to view every .js as ".js.txt" and then the file appears on the server as thisismyfile.js.txt Not ideal... Does anyone know how to work around this. Is it a mime type problem with Drupal or the server, or is Drupal set up to avoid script uploads and n00b hack attacks. Once the files are uploaded I intend to use PHP mode on the page or node to call drupal_add_css and drupal_add_js.

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• case-insensitive regexp match on non-english text in perl cgi script

  - by jonny

  ok. I have list of catalog paths and need to filter out some of them. Match pattern comes in non-Unicode encoding. Tried following: require 5.004; use POSIX qw(locale_h); my $old_locale = setlocale(LC_ALL); setlocale(LC_ALL, "ru_RU.cp1251"); @{$data -> {doc_folder_rights}} = grep { $_->{doc_folder} =~/$_REQUEST{q}/i; # catalog path pattern in $_REQUEST{q} } @{$data -> {doc_folder_rights}}; setlocale(LC_ALL, $old_locale); What I need is case-insensitive regexp pattern matching when pattern contains russsian letters.

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• Porting iPhone app to iPad fails to sign?

  - by mobibob

  I am able to create a new application profile targeted for my iPad, however, when I convert from iPhone to "Universal" device, I am getting an error in signing. [BEROR]Code Sign error: a valid provisioning profile matching the application's Identifier 'rfc1034identifier' could not be found Also note: I am able to run it in the simulator (which does not require signing). It is a very old application ~OS version 2.x or 3.1 that had SDK problems which required more manual process to get the signing code into the build settings, so I would not be surprised if there is some residual foo in the build settings.

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• How long does a reverse DNS lookup take?

  - by HansA

  How long should I expect a reverse lookup take? 100 milliseconds? 1 second? 10 second? 30 seconds? What's your experience? Why? We're debating adding a feature to our server software which would require a reverse DNS lookup each time a client connects. The lookup would be done synchronously, so I'm worried that it could slow connection-times down a lot. I just wanted to hear other people's experience regarding reverse DNS lookup times.

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• Middel East XML Currency Conversion

  - by Tim

  Hi, Using the following script to do currency conversion which relies on an xml feed. http://www.white-hat-web-design.co.uk/articles/php-currency-conversion.php It grabs the data from the following feed... var $xml_file = "www.ecb.int/stats/eurofxref/eurofxref-daily.xml"; However this xml feed has limited currencies and i require currencies for the middle east. Does anyone know where i can find an xml file with middle east currencies or have any better suggestions? Any help would be appreciated.

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• Mysql results sorted by list which is unique for each user

  - by ADAM

  Ive got a table of thousands of products and 50 or so authenticated users. These users all show the products on their own web sites and they all require the ability to have them ordered differently. Im guesing i need some kind of seperate table for the orders which contains the product_id, user_id and order column? How do i do this the most efficiently in mysql so as to be very fast, and not slow down if i get millions of products in the database. Is it even wise to do it in mysql or should i be using some kind of other index like solr/lucene? My Product table is called "products" My User table is called "users" A good example of the functionality i need is google search where you can order/supress the results if you are logged in. edit: the product results will be paginated and the users have the authority to edit the products, so its not just ready only

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• Copying files from a Rails plugin into the application upon plugin install

  - by Lou Z.

  When someone installs this plugin, I would like a file to be copied into the config/initializers directory of the app. I could do this in install.rb by copying a template file that resides somewhere in the plugin. Another option would be to require the user to run a generator after install. I know rspec-rails makes you run a generator after you install it, is that the recommended behavior? And is there anything wrong with copying files into the application in install.rb? Thanks! Lou

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• parsing html pages from tcl

  - by mithunmo

  Hello , I using tdom version 0.8.2 to parse html pages. From the help pages I found the following commands to get the ElementById TCL code set html {<html> <head> </head> <body> <div id="m"> </div> </body> </html> } package require tdom set doc [ dom parse -html $html ] set node [ $doc getElementById m] But when I execute the second set command I get a empty string . But cleary the tag has an id of m . Can someone tell where am I going wrong ? Regards, Mithun

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• Nunit test project won't compile under mono

  - by Quandary

  Question: I am implementing an OpenSource version of Microbosoft Sync framework, [http://www.microsoft.com/downloads/d...isplaylang=en] (Checkout: git clone [email protected]:quandary/SyncFramework.git) but I ran into a unittest problem. I added a nunit test-project to the C# project, but it's not compiling... I created the project on Windows, and there it compiled well. On Linux, the project compiles well, but compiling the unittest, I always get: Assembly 'nunit.framework, Version=2.5.5.10112, Culture=neutral, PublicKeyToken=96d09 My problem now is I installed nunit and added a reference to it (on Linux with mono), but I still get this message, I take out 'require specific version', and I still get this message... I also removed the windows reference to nunit, but still no change.

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• Splitting a string according to a delimiter when elements in the string can contain the delimiter

  - by Vivin Paliath

  I have a string that looks like this: "#Text() #SomeMoreText() #TextThatContainsDelimiter(#blah) #SomethingElse()" I'd like to get back [#Text(), #SomeMoreText(), #TextThatContainsDelimiter(#blah), #SomethingElse()] One way I thought about doing this was to require that the # to be escaped into \#, which makes the input string: "#Text() #SomeMoreText() #TextThatContainsDelimiter(\#blah) #SomethingElse()" I can then split it using /[^\\]#/ which gives me: [#Text(), SomeMoreText, TextThatContainsDelimiter(\#blah), SomethingElse()] The first element will contain # but I can strip it out. However, is there a cleaner way to do this without having to escape the #, and which ensures that the first element will not contain a #? Basically I'd like it to split by # only if the # is not enclosed by parentheses. My hunch is that since the # is context-sensitive and and regular expressions are only suited for context-free strings, this may not be the right tool. If so, would I have to write a grammar for this and roll my own parser/lexer?

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• Lazy loading of ESB in a jruby rails app

  - by brad

  I have a jruby/rails app using: jruby 1.4.0 Rails 2.3.5 ActiveMQ 5.3.0 Mule ESB 2.2.1 Currently in our environment.rb file we start up Mule in the initializer. This becomes a big pain when we go to do normal rake tasks that don't require JMS/Mule such as db:migrate as it takes a long time to startup/shutdown Mule everytime. The code is similar to this: APP_CONTEXT = Java::our.company.package.service_clients.Initializer.getAppContext(MULE_CONFIG_PATH) And we use APP_CONTEXT to fetch the bean to connect to the appropriate service. I'm trying to figure out some mechanism by which APP_CONTEXT could be lazily instantiated (not in initialize) to avoid all of the pains of having to startup Mule on initialize. Currently we have a few ruby client classes that are instantiated as a before_filter in application_controller such as @data_service = DataService.new(APP_CONTEXT) that initialize the proper java client for each request for use in our controllers. I'm open to all suggestions. I'm having a hard time trying to find the right place to put this lazy instantiation.

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• How do I write x86 Debug registers from user space on OSX?

  - by nall

  I'd like to play around with the debug MSRs defined in the x86 spec (DR0-7) from my OSX user-space program. Unfortunately, these require CPL == 0 (aka ring 0). I've thumbed through the OSX syscalls and with the exception of kernel_debug nothing really jumps out as a way to access these. It may be the case that they are only available via some higher level interface like kernel_debug, but it's unclear to me if that's the case or if I just haven't found the magic invocation to get to them. Anyone know how to do this?

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• How to return variable datatypes from a method

  - by Praesagus

  I have a method whose callers require different datatypes. I could repeat the requisite conversions a dozen times by putting them in each of the callers, but it seems much more efficient to do it once in the called method. public String myMethod(String myArg) { return DoSomething(myArg); } public Int32 myMethod(String myArg) { return Convert.ToInt32(DoSomething(myArg)); } private String DoSomething(key) { return SomeList[key]; } If I have multiple methods that pull data from SomeList and have to utilize different data types then in each I have to do a type conversion. Examples might be session variables or query or form requests or any other number of things. In VB I could say Function myMethod(myArg as String) as Variant myMethod=DoSomething(myArg) End Function Sorry if the original post was not very clear. I hope this makes more sense. Thanks

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• Comet implementation for ASP.NET?

  - by Hitchhiker

  I've been looking at ways to implement gmail-like messaging inside a browser, and arrived at the Comet concept. However, I haven't been able to find a good .NET implementation that allows me to do this within IIS (our application is written in ASP.NET 2.0). The solutions I found (or could think of, for that matter) require leaving a running thread per user - so that it could return a response to him once he gets a message. This doesn't scale at all, of course. So my question is - do you know of an ASP.NET implementation for Comet that works in a different way? Is that even possible with IIS?

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• Address calling class [Java]

  - by Samuel

  Hello! [I am rather new to Java and Object Oriented programming] I have an abstract class Moveable with the method abstract void move() which is extended by the class Bullet and the abstract class Character, and Character is extended by the class Survivor and the class Zombie. In Survivor and Bullet the move() method doesnt require any parameters while in the class Zombie the move() method depends on the actual position of the survivor. The survivor and multiple zombies are created in the class Gui. I wanted to access the survivor in Zombie - what's the best way of doing this? In Gui i wrote a method getSurvivor() but i don't see how to access this method in Zombie? I am aware that as a workaround i could just pass a [Survivor survivor] as parameter in move() and ignore it in Bullet and Survivor, but that feels so ... bad practice. Thank you for your time! Samuel [I am not sure what tags to set here, please correct me if i'm wrong]

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• Parsing a UTF-16 encoded xml file in ruby with REXML

  - by Matthew Toohey

  Hello, I'm trying to parse the following UTF-16 encoded xml file in REXML: http://www.abc.net.au/triplej/feeds/playout/triplejsydneyplayout.xml?_523525 REXML encounters an error after the following: >> require 'rexml/document' => true >> include REXML => Object >> require 'net/http' => true >> triplejString = Net::HTTP.get('www.abc.net.au', '/triplej/feeds/playout/triplejsydneyplayout.xml?_523525') => "\377\376<\000?\000x\000m\000l\000 \000v\000e\000r\000s\000i\000o\000n\000=\000\"\0001\000.\0000\000\"\000 \000e\000n\000c\000o\000d\000i\000n\000g\000=\000\"\000u\000t\000f\000-\0001\0006\000\"\000?\000>\000<\000a\000b\000c\000m\000u\000s\000i\000c\000_\000p\000l\000a\000y\000o\000u\000t\000>\000<\000c\000h\000a\000n\000n\000e\000l\000>\000J\000J\000J\000<\000/\000c\000h\000a\000n\000n\000e\000l\000>\000<\000p\000u\000b\000l\000i\000s\000h\000t\000i\000m\000e\000>\000F\000r\000i\000,\000 \0003\0000\000 \000A\000p\000r\000 \0002\0000\0001\0000\000 \0001\0001\000:\0005\0007\000:\0001\0007\000 \000G\000M\000T\000<\000/\000p\000u\000b\000l\000i\000s\000h\000t\000i\000m\000e\000>\000<\000i\000t\000e\000m\000s\000>\000<\000i\000t\000e\000m\000>\000<\000p\000l\000a\000y\000i\000n\000g\000>\000n\000o\000w\000<\000/\000p\000l\000a\000y\000i\000n\000g\000>\000<\000t\000i\000t\000l\000e\000>\000D\000o\000c\000t\000o\000r\000,\000 \000D\000o\000c\000t\000o\000r\000<\000/\000t\000i\000t\000l\000e\000>\000<\000t\000r\000a\000c\000k\000i\000d\000>\000<\000/\000t\000r\000a\000c\000k\000i\000d\000>\000<\000p\000l\000a\000y\000e\000d\000t\000i\000m\000e\000>\000F\000r\000i\000,\000 \0003\0000\000 \000A\000p\000r\000 \0002\0000\0001\0000\000 \0001\0001\000:\0005\0007\000:\0001\0007\000 \000G\000M\000T\000<\000/\000p\000l\000a\000y\000e\000d\000t\000i\000m\000e\000>\000<\000p\000u\000b\000l\000i\000s\000h\000e\000r\000>\000<\000/\000p\000u\000b\000l\000i\000s\000h\000e\000r\000>\000<\000d\000a\000t\000e\000c\000o\000p\000y\000r\000i\000g\000h\000t\000e\000d\000>\0002\0000\0000\0003\000<\000/\000d\000a\000t\000e\000c\000o\000p\000y\000r\000i\000g\000h\000t\000e\000d\000>\000<\000d\000u\000r\000a\000t\000i\000o\000n\000>\0001\0006\0003\000<\000/\000d\000u\000r\000a\000t\000i\000o\000n\000>\000<\000a\000u\000s\000t\000>\000N\000o\000<\000/\000a\000u\000s\000t\000>\000<\000t\000r\000a\000c\000k\000n\000o\000t\000e\000>\000<\000/\000t\000r\000a\000c\000k\000n\000o\000t\000e\000>\000<\000t\000r\000a\000c\000k\000l\000i\000n\000k\000>\000<\000/\000t\000r\000a\000c\000k\000l\000i\000n\000k\000>\000<\000s\000h\000o\000w\000>\000<\000/\000s\000h\000o\000w\000>\000<\000t\000a\000l\000e\000n\000t\000>\000<\000/\000t\000a\000l\000e\000n\000t\000>\000<\000a\000l\000b\000u\000m\000>\000<\000a\000l\000b\000u\000m\000n\000a\000m\000e\000>\000D\000r\000i\000v\000i\000n\000g\000 \000F\000o\000r\000 \000T\000h\000e\000 \000S\000t\000o\000r\000m\000/\000D\000o\000c\000t\000o\000r\000 \000D\000o\000c\000t\000o\000r\000<\000/\000a\000l\000b\000u\000m\000n\000a\000m\000e\000>\000<\000a\000l\000b\000u\000m\000i\000d\000>\0008\0003\000-\0004\0002\0002\0006\0009\000<\000/\000a\000l\000b\000u\000m\000i\000d\000>\000<\000a\000l\000b\000u\000m\000i\000m\000a\000g\000e\000>\000h\000t\000t\000p\000:\000/\000/\000w\000w\000w\000.\000a\000b\000c\000.\000n\000e\000t\000.\000a\000u\000/\000t\000r\000i\000p\000l\000e\000j\000/\000c\000o\000v\000e\000r\000s\000/\000G\000y\000r\000o\000s\000c\000o\000p\000e\000 \000-\000 \000D\000r\000i\000v\000i\000n\000g\000 \000F\000o\000r\000 \000T\000h\000e\000 \000S\000t\000o\000r\000m\000/\000D\000o\000c\000t\000o\000r\000 \000D\000o\000c\000t\000o\000r\000 \000(\0002\0000\0000\0003\000)\000.\000j\000p\000g\000<\000/\000a\000l\000b\000u\000m\000i\000m\000a\000g\000e\000>\000<\000/\000a\000l\000b\000u\000m\000>\000<\000a\000r\000t\000i\000s\000t\000>\000<\000a\000r\000t\000i\000s\000t\000n\000a\000m\000e\000>\000G\000y\000r\000o\000s\000c\000o\000p\000e\000<\000/\000a\000r\000t\000i\000s\000t\000n\000a\000m\000e\000>\000<\000a\000r\000t\000i\000s\000t\000i\000d\000>\000<\000/\000a\000r\000t\000i\000s\000t\000i\000d\000>\000<\000a\000r\000t\000i\000s\000t\000n\000o\000t\000e\000>\000<\000/\000a\000r\000t\000i\000s\000t\000n\000o\000t\000e\000>\000<\000a\000r\000t\000i\000s\000t\000l\000i\000n\000k\000>\000<\000/\000a\000r\000t\000i\000s\000t\000l\000i\000n\000k\000>\000<\000/\000a\000r\000t\000i\000s\000t\000>\000<\000/\000i\000t\000e\000m\000>\000<\000/\000i\000t\000e\000m\000s\000>\000<\000/\000a\000b\000c\000m\000u\000s\000i\000c\000_\000p\000l\000a\000y\000o\000u\000t\000>\000" >> xmlDoc = REXML::Document.new(triplejString) REXML::ParseException: #<REXML::ParseException: malformed XML: missing tag start Line: Position: Last 80 unconsumed characters: <?xml version="1.0" encoding="utf-16"?><a> /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/parsers/baseparser.rb:356:in `pull' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/parsers/treeparser.rb:22:in `parse' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/document.rb:227:in `build' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/document.rb:43:in `initialize' (irb):19:in `new' (irb):19:in `irb_binding' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/workspace.rb:52:in `irb_binding' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/workspace.rb:52 ... malformed XML: missing tag start Line: Position: Last 80 unconsumed characters: <?xml version="1.0" encoding="utf-16"?><a Line: Position: Last 80 unconsumed characters: <?xml version="1.0" encoding="utf-16"?><a from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/parsers/treeparser.rb:92:in `parse' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/document.rb:227:in `build' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rexml/document.rb:43:in `initialize' from (irb):19:in `new' from (irb):19 Any ideas?

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