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• What is the sequence followed by the Linux kernel to configure a device?

  - by Jaime Soriano

  As I understood after reading the chapter related to The Linux Device Model in the Linux Device Drivers 3rd Edition, when a new device is configured, the kernel follows more or less this sequence: The Device is registered in the driver core (device_register(), what includes device initialization) A kobject is registered in the device model It provokes a hotplug event Bus and drivers are checked to see which one matches with the device Probe Device is binded to the driver My main doubt is, in step 1, when is device_register() called and what info should be yet in the device struct? Is it called by the bus to which the device is connected? Any example in the code? Have I misunderstood something? :)

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• When should assertions stay in production code?

  - by Carl Seleborg

  Hi all, There's a discussion going on over at comp.lang.c++.moderated about whether or not assertions, which in C++ only exist in debug builds by default, should be kept in production code or not. Obviously, each project is unique, so my question here is not so much whether assertions should be kept, but in which cases this is recommendable/not a good idea. By assertion, I mean: A run-time check that tests a condition which, when false, reveals a bug in the software. A mechanism by which the program is halted (maybe after really minimal clean-up work). I'm not necessarily talking about C or C++. My own opinion is that if you're the programmer, but don't own the data (which is the case with most commercial desktop applications), you should keep them on, because a failing asssertion shows a bug, and you should not go on with a bug, with the risk of corrupting the user's data. This forces you to test strongly before you ship, and makes bugs more visible, thus easier to spot and fix. What's your opinion/experience? Cheers, Carl See related question here

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• Command-line options for HH and opening CHM Windows Help Files

  - by Jeromy Anglim

  I'd like to be able to write Inquisit scripts in Vim. In the standard Inquisit application for writing scripts, I can press F1 and it brings up help on the topic related to the word under the cursor. I'd like to set up the same functionality through Vim. The help file for Inquisit is stored in a Windows .CHM file. I figured there must be a set of command-line options for doing a keyword search in a chm file, but I haven't been able to find a complete list of the command-line options, presumably for HH.exe. I did find this page with a few pointers, but it does not have a full listing of command-line options. I also found this discussion on AutoHotKey discussion board. It mentions keyhh. I also just found a vimscript designed to do exactly what I want Questions: Is there a complete list of command-line options for HH.exe? Is there a better way of going about what I am trying to do?

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• django models objects filter

  - by ha22109

  Hello All, I have a model 'Test' ,in which i have 2 foreignkey models.py class Test(models.Model): id =models.Autofield(primary_key=True) name=models.ForeignKey(model2) login=models.ForeignKey(model1) status=models.CharField(max_length=200) class model1(models.Model): id=models.CharField(primary_key=True) . . is_active=models.IntergerField() class model2(model.Model): id=models.ForeignKey(model1) . . status=model.CharField(max_length=200) When i add object in model 'Test' , if i select certain login then only the objects related to that objects(model2) should be shown in field 'name'.How can i achieve this.THis will be runtime as if i change the login field value the objects in name should also change.

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• Oracle(10) SQL: calculating final sum depending on two field

  - by Zsolt Botykai

  First the disclaimer: I never learnt any programming in school, and just have to deal with various SQL problems (too). So now I've got two tables, TABLE1: ACCNO BAL1 BAL2 11111 20 10 And TABLE2 (which has the ACCNO key, of course) related rows to '11111': DATENUM AMT 1 -5 2 -10 3 8 4 -23 5 100 6 -120 7 140 Now I have to find the new BAL1 and BAL2 using the following rules: BAL1 AMT must be substracted from or added to BAL1 until BAL1 == 0 (and BAL2 0) if BAL1 reaches 0 then the (if any) remainder of BAL1 must be substracted from BAL2 if BAL2 reaches 0 too, from then only BAL1 should be modified. So using the above data: DATENUM AMT BAL1 BAL2 0 0 20 10 /*starting record*/ 1 -5 15 10 2 -10 5 10 3 8 13 10 4 -23 0 0 5 100 100 0 6 -120 -20 0 7 140 20 0 And I need the last two BAL1 and BAL2. How can I calculate them using (Oracle 10) SQL?

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• ISS Not working

  - by 3bd

  I have a web site that built on Visual studio 2008 and i need to run it from my computer (Win 7 Ultimate) as a server I tried to publish it to IIS and this is simply not working and i have the flowing error : Error Summary HTTP Error 500.19 - Internal Server Error The requested page cannot be accessed because the related configuration data for the page is invalid. Config Error This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false". any one can help?

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• Visual Python - Visualize graphs relating to a movement

  - by Francisco P.

  Hello, everyone! I'm working with visual python on a project where I need to simulate a physical movement. I'd like to present, in a different window than the one the actual, 3D sim is running, two graphs, both related to the movement: How the velocity and angular velocity progress over time. How the movement and rotation progress over time. All these vars are refreshed once per cycle (inside a while(true)) How can I accomplish this? Thank you for your time!

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• How to create SSIS package to update from one database to another database within same server

  - by Pavan Kumar

  My query is related to the answers i got for questions i had posted earlier in the same forum. I have a copy of a client database which is attached to SQL Server where the Central Database exists. The copy already contains the updated data. I just want to update from that copy to Central Database both holding same schema and are present in the same server using C# .NET. One of the solution i got was to create SSIS package and run it from the UI. I want to know as how i can create SSIS Package to achieve this. I am new to SSIS. I am using SQL Server 2005 Standard Edition and Visual Studio 2008 SP1 installed. I learnt that BIDS 2005 is used to create packages which comes by default with SQL Server 2005. Can someone please give me a example as i am new to this.

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• Passenger apache default page error

  - by Ganesh Shankar

  Sorry if this is the wrong place to ask this question. I asked it a couple of days ago on Server Fault but am getting no love. (It is sort of related to rails development...) The Question I just installed Passenger and the Passenger Pref Pane on OSX. However, when I try to browse to one of my Rails applications I just get the default Apache "it works!" page. I've checked the vhost definitions and they seem ok so I can't seem to figure out whats wrong... I've tried reinstalling passenger and the pref pane and restarting apache but to no avail. Anyone know how to fix this? My vhost definition looks like this: <VirtualHost *:80> ServerName boilinghot.local DocumentRoot "/Users/ganesh/Code/boilinghot/public" RailsEnv development <Directory "/Users/ganesh/Code/boilinghot/public"> Order allow,deny Allow from all </Directory> </VirtualHost>

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• What the performance impact of enabling WebSphere PMI

  - by Andrew Whitehouse

  I am currently looking at some JProfiler traces from our WebSphere-based application, and am noticing that a significant amount of CPU time is being spent in the class com.ibm.io.async.AsyncLibrary.getCompletionData2. I am guessing, but I am wondering whether this is PMI-related (and we do have this enabled). My knowledge of PMI is limited, as this is managed by another team. Is it expected that PMI can have this sort of impact? (If so) Is the only option to turn it off completely? Or are there some types of data capture that have a particularly high overhead?

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• What's your favorite vim color scheme?

  - by Nathan Long

  Wwhat is your favorite vim color scheme? I haven't found a great one yet, but what I'd like, in order of priority, are: Never confuses me. For example: When matching braces are highlighted, it's easy to see where the cursor is When I've got two or more tabs open, I can read all the titles and easily tell which one is active (maybe inactive ones look faded out) Very readable, both for regular code and for highlighting It would be nice if it was attractive I found one scheme that was ALMOST perfect (peaksea), but not quite - I couldn't read the titles of non-active tabs. So on a related note: anybody know a clear reference page for tweaking the colors of specific items?

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• Rails polymorphic associations, two assoc types in one class

  - by snitko

  Consider a class: class Link < ActiveRecord::Base has_many :link_votes, :as => :vote_subject, :class_name => 'Vote' has_many :spam_votes, :as => :vote_subject, :class_name => 'Vote' end The problem is, when I'm adding a new vote with @link.link_votes << Vote.new the vote_subject_type is 'Link', while I wish it could be 'link_votes' or something like that. Is this an AR limitation or is there a way to workaround this thing? I've actually found one related answer, but I'm not quite sure about what it says: http://stackoverflow.com/questions/1168047/polymorphic-association-with-multiple-associations-on-the-same-model/1764117#1764117

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• How to spot empty parking spaces?

  - by mithila

  I want to do a final year B.Sc project on parking space detection. Can anybody give me some link related to it? Any text-book, tutorial or anything? What would be prerequisite for this project? What type of skills(programming/math) are needed? What are the initial steps to do? What type of readings(algorithms of image processing) are needed? Detail added in comments: i'm going to use camera, not infrared. i would like to use still images, or one camera which captures images from a parking lot. i think reak-time processing will be tough, at this moment i just need to start the project. so still images will work fine. but later it may b a real-time project

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• Query Cache Issues - releasing cache locks?

  - by Corey Coogan

  I have enabled query caching to use the NHibernate.Caches.Prevalence.PrevalenceCacheProvider provider. This is running on IIS 7, WCF service. I have limited rights to what I can do, but I'm getting an exception about releasing cache locks. I've created the following 2 directories in the system32/inetsrv directory and given full control to the account IIS is using. NHibernate.Cache.StandardQueryCache Some other cache dir I can think of right now This doesn't happen in my local environment so I'm thinking this is somehow related to caching. Do I need to give the IIS account full control to the inetsrv dir as well?

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• What's the difference between !col and col=false in MySQL?

  - by Mask

  The two statements have totally different performance: mysql> explain select * from jobs where createIndexed=false; +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ | 1 | SIMPLE | jobs | ref | i_jobs_createIndexed | i_jobs_createIndexed | 1 | const | 1 | | +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ 1 row in set (0.01 sec) mysql> explain select * from jobs where !createIndexed; +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ | 1 | SIMPLE | jobs | ALL | NULL | NULL | NULL | NULL | 17996 | Using where | +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ Column definition and related index for aiding analysis: createIndexed tinyint(1) NOT NULL DEFAULT 0, create index i_jobs_createIndexed on jobs(createIndexed);

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• synchronizing audio over a network

  - by sharkin

  I'm in startup of designing a client/server audio system which can stream audio arbitrarily over a network. One central server pumps out an audio stream and x number of clients receives the audio data and plays it. So far no magic needed and I have even got this scenario to work with VLC media player out of the box. However, the tricky part seems to be synchronizing the audio playback so that all clients are in audible synch (actual latency can be allowed as long as it is perceived to be in sync by a human listener). My question is if there's any known method or algorithm to use for these types of synchronization problems (video is probably solved the same way). My own initial thoughts centers around synchronizing clocks between physical machines and thereby creating a virtual "main timer" and somehow aligning audio data packets against it. Some products already solving the problem: http://www.sonos.com http://netchorus.com/ Any pointers are most welcome. Thanks. PS: This related question seem to have died long ago.

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• Can a PL/pgSQL function contain a dynamic subquery?

  - by morpheous

  I am writing a PL/pgSQL function. The function has input parameters which specify (indirectly), which tables to read filtering information from. The function embeds business logic which allows it to select data from different tables based on the input arguments. The function dynamically builds a subquery which returns filtering data which is then used to run the main query. My questions are: Is it 'legal' to use a dynamic subquery in a PL/pgSQL function. I cant see why not - but this question is related to the next one. AFAIK, PL/pgSQL are cached or precompiled by the query engine. How does having a function that generates dynamic subqueries impact the work of the query engine?

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• PHP page load seems to be requesting itself and misinterpreting the result

  - by Regis Frey

  I'm working on a messy PHP page by another developer and I was analyzing the resource view in the Webkit developer tools and noticed that the page (index.php) makes an HTTP requests for itself and then interprets the results as an image despite it being sent with the text/html header. Because of this it throws the warning: Resource interpreted as image but transferred with MIME type text/html. Looking at the time graph the call comes after the <head> because it has already requested images for the body. Sometimes there are even two 'bad' requests. Can anyone explain what might be happening and/or suggest how to fix this? Could these be related to PHP includes?

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• Can i use a SELECT statement to define a CHECK constraint?

  - by Neel

  In MS SQL server, can i use a SELECT statement to define a CHECK constraint? Say i have to work with two tables "Customer Master" and "Indian Customer" in ideal situation both tables are compleatly different, and are not interrelated in anyways. however they share the same database Content of "Customer Master": CustomerName (colomn): a, b, c, d, e Branchlocation (colomn): IN, AU, IN, IN, UK Content of "Indian Customer": customerID (colomn): 1, 2, 3 CustomerName (colomn): a, c, d customer details (colomn): details1, details, details . . . In Table "Indian Customer" i want to put a constraint so that the users entring data in this table should not be able to enter customers that dont exist in "Customer Master" or whose branch location is not IN. also the tables are in the same project but are not directly related.

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• MySQL index cardinality - performance vs storage efficiency

  - by Sean

  Say you have a MySQL 5.0 MyISAM table with 100 million rows, with one index (other than primary key) on two integer columns. From my admittedly poor understanding of B-tree structure, I believe that a lower cardinality means the storage efficiency of the index is better, because there are less parent nodes. Whereas a higher cardinality means less efficient storage, but faster read performance, because it has to navigate through less branches to get to whatever data it is looking for to narrow down the rows for the query. (Note - by "low" vs "high", I don't mean e.g. 1 million vs 99 million for a 100 million row table. I mean more like 90 million vs 95 million) Is my understanding correct? Related question - How does cardinality affect write performance?

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• Working with DataBinding and Page_Load in ASP.NET MVP

  - by Joel

  I'm using WebForms MVP to create some simple reporting applications. Most of these applications consist of a few search criteria inputs and a ComponentArt datagrid that I'm populating with data from the database. Most of the markup is in a UserControl, which is in a content page with a master page. My problem is that the control's Page_Load event is firing before the control events that caused the postback in the first place. Basically, the user clicks the search button, and Page_Load is fired BEFORE Search_Click. This is messing with the databinding scheme I've been using. So that's the question: Why is my Page_Load event firing before the event handler, and what can I do about it? I don't THINK this problem is related to WebForms MVP or ComponentArt, but obviously I could be wrong. Thanks.

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• How UIWindow#addSubview can make memory leak?

  - by Jakub

  Hello, I started to learn using Instrument, but I cannot figure it out. After I start my application, the UI shows up, I do nothing and after few seconds I can see memory leak detected: When I have a look at the second leak I can see the following stack: When I double click on the cell related to my code I can see that it is pointing to the following line of code: [window addSubview:newPostUIViewController.view]; from the method: - (void)applicationDidFinishLaunching:(UIApplication *)application { //creating view controller newPostUIViewController = [[NewPostUIViewController alloc] initWithNibName:@"NewPostView" bundle:nil]; newPostUIViewController.title = @"Post it!"; [window addSubview:newPostUIViewController.view]; // Override point for customization after application launch [window makeKeyAndVisible]; } I wonder, how this can be a reason of a leak? I release newPostUIViewController in the dealloc method of PostItAppDelegate class. Any ideas how this could be explained?

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• How will a search engine read data from my Ajax-based webapp?

  - by Jack W-H

  OK, not entirely related to programming, so I'm sorry. But I'd like to know about this: So I've got a webapp. There's one column where a list of results are fetched from the database. When you click one, jQuery fetches the information associated with that result and puts it into the second column - all without a refresh and using Ajax. Is it possible for Google to still read it etc.? I understand it can follow links... but presumably not Javascript actions etc.? If this is the case, what do other Ajax-heavy websites do about search engine optimisation? Jack

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• Getting ready to learn html5

  - by vtortola

  I'm a desktop application developer, and I plan learning html5, but as it's not released, there are (almost) no published books and not too much infomation for beginners on the web... I feel I should start with html4 and the current web development skills. I think I should start with html4, css, and javascript... but there are so many technologies related that I get lost :D So, what current technologies will be still used when html5 is released? I mean, what about "jquery" and "ajax"? I know they are javascript under the hood, but will they still make sense in the future? What would you recommend me considering that I have just a little bit of html knowlegde, almost null CSS and completely null in javascript?

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• Is it possible to have AVFramework and AudioToolbox framework in one app?

  - by Satyam

  I'm trying to write develop audio related application. In that, I'm using AudioToolBox framework for recording the sound. And I'm using AVFramework to play soudns. When app is stared, it will play some mp3 file using AVFramework. And also initializes Audiotoolbox. In simulator, I'm able to record and play. But when I'm testing it on iPhone, I'm getting following error for initializing AudioToolBox. 2009-12-11 22:25:51.599 StoryBook[807:207] AudioRecorder init AudioSessionInitialize failed with error: 1768843636 Can some one tell me whether we can use both AV as well as Audio Toolbox frame works in one application? Why I'm getting that error?

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