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• Using many mutex locks

  - by hanno

  I have a large tree structure on which several threads are working at the same time. Ideally, I would like to have an individual mutex lock for each cell. I looked at the definition of pthread_mutex_t in bits/pthreadtypes.h and it is fairly short, so the memory usage should not be an issue in my case. However, is there any performance penalty when using many (let's say a few thousand) different pthread_mutex_ts for only 8 threads?

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• How to move forward in VIM Tag Searching and Navigation?

  - by Srikanth

  Ctrl + ] is to jump to the definition. Ctrl + T is to go back. What's the opposite of Ctrl + T?

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• How To Read C# API From Java Background

  - by ChloeRadshaw

  I come from a Java background and have been using C# for the last year - So far the API docs I use are at MSDN (http://msdn.microsoft.com/en-us/library/ms132397.aspx). I tend to use the lightweight C# docs. What annoys me about that is that I don't see one page with details of the class, a list of members, a list of methods and properties like I would with a Java API definition. Is this possible?

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• SQLAlchemy introspection

  - by Shaman

  What I am trying to do is to get from SqlAlchemy entity definition all it's Column()'s, determine their types and constraints, to be able to pre-validate, convert data and display custom forms to user. How can I introspect it? Example: class Person(Base): ''' Represents Person ''' __tablename__ = 'person' # Columns id = Column(String(8), primary_key=True, default=uid_gen) title = Column(String(512), nullable=False) birth_date = Column(DateTime, nullable=False) I want to get this id, title, birth date, determine their restrictions (such as title is string and max length is 512 or birth_date is datetime etc) Thank you

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• How do I make vim indent java annotations correctly?

  - by wds

  When indenting java code with annotations, vim insists on indenting like this: @Test public void ... I want the annotation to be in the same column as the method definition but I can't seem to find a way to tell vim to do that, except maybe using an indent expression but I'm not sure if I can use that together with regular cindent. edit: The filetype plugin was already turned on I just got a bit confused about indenting plugins. The accepted answer may be a bit hackish but works for me as well.

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• When a tech document states that something is IP-Aware was does that specifically mean?

  - by Mike

  I need a class room definition for IP-aware for a research assignment. I.E. something that would be used, lets say, in a dictionary. Does anyone know or provide me with a link to a defintiion, I am having no luck with searches. Are IP-Aware devices only devices that can read/find/make decisions based on IP addresses. For example a router would be one, but a network printer would not?

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• How to get structed result using nested set in MySQL and PHP?

  - by user198729

  There is no limitation on the depth. How to get the structed branch or even entire tree? The definition is from here: http://dev.mysql.com/tech-resources/articles/hierarchical-data.html

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• Javawebparts Ajaxparts: Using same Axis event multiple times in signle form.

  - by Bloodboiler

  I'm using Javawebparts Ajaxparts and would like to use one axis event multiple times in a form. Problem is that std:InnerHTML responseHandler takes its target html tag id in axis-config.xml so it seems impossible to reuse the definition when only thing that should change is the target tag id. Is there a way to set responseHandler parameters on the the page where it is used (in asix:event tag or someting)?

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• Standalone application in C, a good idea?

  - by chutsu

  The term has several definition according to Wikipedia, however what I'm really interested in is creating a program that has all its needed dependencies included within the source folder, so the end user doesn't need to install additional libraries for the app to install. For example, how Mac apps has all its dependencies all within the program itself already... or is there a function that autotools does this? I'm programming in the Linux environment...

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• '+=' : pointer on left; needs integral value on right

  - by numerical25

  I am confused. I can not use this on a float? must it be a interger ?? I try to define that as a point but I guess I can not convert float to float * //global definition float g_posX = 0.0f; &g_posX -= 3.03f;

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• Effects of order of columns, while defining an index on them, on the performance of the queries

  - by Hossein

  Hi, Does order of the columns in an Index definition for a table in a database has any effect on the performance? for e.g. are these two queries different ? CREATE INDEX xxx ON tablex(col1,col2) CREATE INDEX xxx ON tablex(col2,col1) what about the in case that I use a BTREE index? I am using Mysql. thanks

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• ApplicationContext ctx = new FileSystemXmlApplicationContext error

  - by GigaPr

  Hi I am completely new to Java, so sorry if my question may sound a bit stupid. I am following a tutorial on hibernate and i am trying to get the context definition files from the file system. ApplicationContext ctx = new FileSystemXmlApplicationContext( new String[] { "conf/rssWebApplication-services.xml", "conf/rssWebApplication-data-hibernate.xml" }); But i get the following error: found : org.springframework.context.support.FileSystemXmlApplicationContext required: org.jboss.weld.context.ApplicationContext ApplicationContext ctx = new FileSystemXmlApplicationContext( new String[] { "conf/rssWebApplication-services.xml", Any idea what is the problem? Thanks

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• How to get the last build artifact out of the TFS build drop?

  - by flubba

  Hi, Our existing batch build script contains an URL to get the latest product-build (of another build definition) from. How can one access the lattest build drop folder of TFS Team Build? I'm looking for something to access the latest \buildserver\builddrop\Project-2010MMDD.N\

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• How to externalize web.xml servlet init-param? Spring DelegatingFilterProxy for Servlets?

  - by jnorris

  I have a 3rd-party servlet that I cannot modify. It accepts an init-param that I would like to externalize (from web.xml). I can externalize a servlet filter init-param using DelegatingFilterProxy. This effectively moves the servlet filter definition into Spring where there are much more powerful externalization tools (eg: PropertyPlaceholderConfigurer, environment variables, etc.) How can I do this for a servlet?

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• Get a list/tuple/dict of *all* the arguments passed to a function?

  - by Phillip Oldham

  Given the following function: def foo(a, b, c): pass How would one obtain a list/tuple/dict/etc of the arguments passed in? Specifically, I'm looking for Python's version of JavaScript's arguments keyword or PHP's func_get_args() method. What I'm not looking for is a solution using *args or **kwargs; I need to specify the argument names in the function definition (to ensure they're being passed in) but within the function I want to work with them in a list- or dict-style structure.

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• VS2010 constantly searching for something

  - by alekop

  Hi, Recently my VS has started doing a search through all project assemblies after a project is reloaded, or after I close a window following a Go to Definition command. It just says Searching in the status bar, and enumerates the assembly names. It's driving me nuts, because the process can take up to a minute, and it completely locks up the whole application while it's doing this. Has anyone else experienced this? Thanks, Aleko

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• Rails - before_filter than includes updated object

  - by Sam

  I have a before filter than calculates a percentage that needs to include the object that is being updated. Is there a one liner in rails that takes care of this? for example and this is totaly made up: Object.find(:all, :include = :updated_object) Currently I'm sending the object that is getting updated to the definition that calculates the percentage and that works but its making things messy.

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• Most reliable split character

  - by JL

  Update If you were forced to use a single char on a split method, which char would be the most reliable? Definition of reliable: a split character that is not part of the individual sub strings being split.

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• Fixing Combinatorica redefinition of Element

  - by Yaroslav Bulatov

  My code relies on version of Element which works like MemberQ, but when I load Combinatorica, Element gets redefined to work like Part. What is the easiest way to fix this conflict? Specifically, what is the syntax to remove Combinatorica's definition from DownValues? Here's what I get for DownValues[Element] {HoldPattern[ Combinatorica`Private`a_List \[Element] \ {Combinatorica`Private`index___}] :> Combinatorica`Private`a[[Combinatorica`Private`index]], HoldPattern[Private`x_ \[Element] Private`list_List] :> MemberQ[Private`list, Private`x]}

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• How to adjust the distribution of values in a random data stream?

  - by BCS

  Given a infinite stream of random 0's and 1's that is from a biased (e.g. 1's are more common than 0's by a know factor) but otherwise ideal random number generator, I want to convert it into a (shorter) infinite stream that is just as ideal but also unbiased. Looking up the definition of entropy finds this graph showing how many bits of output I should, in theory, be able to get from each bit of input. The question: Is there any practical way to actually implement a converter that is nearly ideally efficient?

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• How to push_back without operator=() for const members?

  - by WilliamKF

  How to push_back() to a C++ std::vector without using operator=() for which the default definition violates having const members? struct Item { Item(int value) : _value(value) { } const int _value; } vector<Item> items; items.push_back(Item(3)); I'd like to keep the _value const since it should not change after the object is constructed, so the question is how do I initialize my vector with elements without invoking operator=()?

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• c++, when do you need/have to pass data as (*&)

  - by ra170

  I came across people passing data objects as: declaration: DataObject * data = 0; calling it as: SomeMethod( data ); definition of Somethod: void SomeMethod(SomeObject * & object) My obvious question is, when and why do you have to do this (& *)? Is it passing the pointer as reference?

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• Ordered hash in JavaScript

  - by hekevintran

  JavaScript objects have no order stored for properties (according to the spec). Firefox seems preserve the order of definition of properties when using a for...in loop. Is this behaviour something that I can rely on? If not is there a piece of JavaScript code somewhere that implements an ordered hash type?

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• What is Control's DesignMode property and how to use it?

  - by sanjuro

  Hi, what is DesignMode property? When it is useful? I don't understand it from msdn definition http://msdn.microsoft.com/en-us/library/system.web.ui.control.designmode.aspx Some example? Thanks for answer.

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• MSVC++ enum underlying type

  - by bobobobo

  MSDN has enum [tag] [: type] {enum-list} [declarator]; // for definition of enumerated type SO it looks like you can specify the type of an enum in MSVC++, but it doesn't seem to work for me: // want "underlying type" of this enum to be char. enum MyCharEnum : char { Val1 ='A', Val2 ='B', Val9 ='X' } ;

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