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• Linux signals with extra information parameter

  - by Tester

  I was to have some extra information in the callback to sa_sigaction handler, it does not seems possible. So I was wondering if you could suggest me alternatives. Basic requirements: Function A raises an signal/event with a pointer to a struct Handler function tackles the event. The handler function would only be called on an event and a loop to wait for the event, as in select() , is undesirable. TIA

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• add a custom view/windows in the mac os X dock

  - by AP

  Hello, I would like to add a custom view (a pager) in the dock, just before the trash and was wondering on how to perform a such task. Do you have any pointer to help me to start? Thanks in advance for your help :) regards,

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• using Hibernate to loading 20K products, modifying the entity and updating to db

  - by Blankman

  I am using hibernate to update 20K products in my database. As of now I am pulling in the 20K products, looping through them and modifying some properties and then updating the database. so: load products foreach products session begintransaction productDao.MakePersistant(p); session commit(); As of now things are pretty slow compared to your standard jdbc, what can I do to speed things up? I am sure I am doing something wrong here.

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• Hibernate query cache automatically refreshed on external update?

  - by artgon

  I'm creating a service that has read-only access to the database. I have a query cache and a second level cache enabled (READ_ONLY mode) in Hibernate to speed up the service, as the tables being accessed change rarely. My question is, if someone goes into the DB and changes the tables manually (i.e. outside of Hibernate), does the cache recognize automatically that it needs to be cleared? Is there a time limit on the cache?

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• C++ Pass a hidden arg to a class constructor?

  - by JP

  I would like to define a class that accept the pointer to it's parent class as an Argument, but would it be possible to somehow pass it without needing to pass it directly such as: class Child { public: Child(Parent* hiddenArg); }; class Parent { public: Child myChild; }; I know this is weird, but I am making my own Signal/Slot implementation and Child would be a signal defined, but I would like to get the parent so I can use it's Event Dispatcher...

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• [C++ / NCURSES] Can't convert from 'int' to 'int *'

  - by flarn2006

  So I have these lines of code: int maxY, maxX; getmaxyx(stdscr, &maxY, &maxX); It gives me the following error: error C2440: '=' : cannot convert from 'int' to 'int *' Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast twice for each time I use it. I'm not even using the = operator! The curses.h file is included. What am I doing wrong?

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• What do people find difficult about C pointers?

  - by Paul

  From the number of questions posted here, it's clear that people have some pretty fundemental issues when getting their heads around pointers and pointer arithmetic. I'm curious to know why. They've never really caused me major problems (although I first learned about them back in the Neolithic). In order to write better answers to these questions, I'd like to know what people find difficult. So, if you're struggling with pointers, or you recently were but suddenly "got it", what were the aspects of pointers that caused you problems?

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• Visual studio keeps building everything

  - by zachary

  I have a large sln with many project. I just made a change in project A and it build 9 other projects that project A references, but that had no code change. Anyone know of any tricks to speed this process up?

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• problems with 'free' in C

  - by lego69

  hello, can somebody please explain can I free const char* ? I allocated new memory using malloc and when I'm trying to free it I always receive an error incompatible pointer type thanks in advance something like this char* name="Arnold"; const char* str=malloc(stlen(name)+1); free(str); <- here bug

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• unix DECLARE_WAIT_QUEUE_HEAD (var) var prototype?

  - by yoavstr

  hello i want to work with 2 queue in the module where i change my pointer to them therefore i need to use : //declartion wait_queue_head_t **currentQ; DECLARE_WAIT_QUEUE_HEAD (readWaitQ1); DECLARE_WAIT_QUEUE_HEAD (readWaitQ2); if(condition){ currentQ = &readWaitQ1; }else{ currentQ = &readWaitQ2; } but i get incorrect type for wake_up an other stuff using the queue. even thought i google it i couldnt find an answer can someone just give me the prototype needed?...

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• How can I use Action Script 3.0 to make random placed Symbols fly by?

  - by William Calleja

  I'm trying to make a simple animation with Flash CS4 and Action Script 3.0 to make a number of Symbols fly by from right to left constantly. What I want is that once a symbol has reached the end of the screen it is destroyed and another one is placed at the start position. I intend to give each symbol a random speed and create a random symbol each time one is 'destroyed'. Any clues where I can start?

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• what is the difference between DWORD and HANDLE type in C?

  - by moon

  i have a thread with return type DWORD in c but it is then handled by a HANDLE type pointer, what is difference between these two types?

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• Question regarding synchronization primitives

  - by mousey

  Hi, Using synchronization primitives slows down the execution of a program. Is there a way to improve the speed of execution ?

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• What are the best free Scheme implementations that you know about?

  - by Aftershock

  When I wrote best I meant: Speed, Have an IDE, a debugger, Compiling to machine code or some other language, Quality of implemenation and, Completeness.

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• Unlimited Online File Storage

  - by AmeL

  Well, I would like to build a file hosting website just like other already did, but it is going to be something different by adding search engine, allowing download and upload in full speed for any user, and so on. Unfortunately the web hosting plans, which declared to support UNLIMITED SPACE rarely allows me to host files on those space. So what I need is the unlimited file storage service which could host all of my users' files. I found Amazon S3, already provides such service, but could anybody recommends me for other better ?

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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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• C/C++ Pre vs Post decrement and increment operators performance difference

  - by TimK

  In some of my programs I have noticed that in some cases there is a difference in speed when using either the pre(++i or --i) and post(i++ or i--) decrement operators. Sometimes pre is faster and other times post is faster. I can't seem to figure out why. Could someone please explain this to me?

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• Resources to get started with Commerce 2009 with SharePoint 2007

  - by Emad

  Hi, I need to get up to speed about developing a commerce site using MS-Commerce server 2009 and SharePoint 2007. I was wondering where are good resources to get started, to explain the concepts and design, etc.

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• managing IB objects without iboutlets

  - by palominoz

  i have got 24 buttons in my project.I need to manage them but I don't want to get my MainViewController polluted by 24 declarations of pointers, properties & synthesizes. i was thinking about using buttonPushed functions and do it like: -(IBAction)buttonPushed:(id)sender{ UIbutton *button=sender; [buttons addObjectAtIndex:[sender tag]]; } my question is:is sender a pointer to the IBObject?

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• How to set css to "label for="email""

  - by Kyle Sevenoaks

  Code: <label for="email">{t _your_email}:</label> CSS: label { display: block; width: 156px; cursor: pointer; padding-right: 6px; padding-bottom: 1px; } I want to make a new CSS for the email label as it's not meant to be that wide.. Just can't think right now :P Thanks.

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• Selecting from a Large Table SQL 2005

  - by Eugene

  I have a SQL table it has more than 1000000 rows, and I need to select with the query as you can see below: SELECT DISTINCT TOP (200) COUNT(1) AS COUNT, KEYWORD FROM QUERIES WITH(NOLOCK) WHERE KEYWORD LIKE '%Something%' GROUP BY KEYWORD ORDER BY 'COUNT' DESC Could you please tell me how can I optimize it to speed up the execution process? Thank you for useful answers.

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• How to test my application With STL such as vector to make sure weather it works or not in c++?

  - by Sam

  *we release and the acquire the pointer with the Linked_ptr in parameter */ Linked_ptr& operator=(const Linked_ptr& r) { if (this != &r) { release(); acquire(r); } return *this; }

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• merging indexed array in Python

  - by leon

  Suppose that I have two numpy arrays of the form x = [[1,2] [2,4] [3,6] [4,NaN] [5,10]] y = [[0,-5] [1,0] [2,5] [5,20] [6,25]] is there an efficient way to merge them such that I have xmy = [[0, NaN, -5 ] [1, 2, 0 ] [2, 4, 5 ] [3, 6, NaN] [4, NaN, NaN] [5, 10, 20 ] [6, NaN, 25 ] I can implement a simple function using search to find the index but this is not elegant and potentially inefficient for a lot of arrays and large dimensions. Any pointer is appreciated.

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• Convert ToString to time format C#

  - by Michael Quiles

  Time.ToString("0.0") shows up as a decimal "1.5" for instead of 1:30 how can I get it to display in a time format. private void xTripSeventyMilesRadioButton_CheckedChanged(object sender, EventArgs e) { //calculation for the estimated time label Time = Miles / SeventyMph; this.xTripEstimateLabel.Visible = true; this.xTripEstimateLabel.Text = "Driving at this speed the estimated travel time in hours is: " + Time.ToString("0.0") + " hrs"; }

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• how to access char*** from dll import in C#

  - by mavrick

  I have a function in win32 dll with signature as: void func1(int a, char*** outData) int a -- input parameter char*** outData -- output parameter - pointer to array of char strings Any idea how to access this in C# using dll import & what should be the signature.

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