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  • POSIX Threads and signal masks

    - by Max
    Is there a way to change the signal mask of a thread from another thread? I am supposed to write a multithreaded C application that doesn't use mutex, semaphores and condition variables, only signals. So it would look like something like this: The main Thread sends SIGUSR1 to its process and and one of the 2 threads (not including the main thread), will respond to the signal and block SIGUSR1 from the sigmask and sleep. Then the main thread sends SIGUSR1 again, the other thread will respond, block SIGUSR1 from its sigmask, unblock SIGUSR1 from the other threads sigmask, so it will respond to SIGUSR1 again. So essentially whenever the main thread sends SIGUSR1 the two other threads swap between each other. Can somebody help?

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  • How to duplicate INSERTS into a seperate table?

    - by Ash
    An iPhone application I have installed uses an SQLite database to log entries with basic INSERTS and DELETES being performed on it. However I wish to keep a permanent log of the INSERTS made to this table, so when an INSERT occurs, I want it to be written to another table also as to create a log. I don't have access to the application source code in order to modify the SQL statements made, I do have access to the SQLite database. Can I do this with triggers? If so can somebody provide a short example.

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  • What are the best JavaScript implementations of a gallery?

    - by gilles27
    We need to implement a gallery feature for our client's new website. They had a similar feature on their last site, which used Smooth Gallery, which in turn was based on Moo Tools. We could go ahead and do the same however, before we do, does anyone have any suggestions for alternatives and if so, please explain why you feel your choice is better.

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  • Using NetBeans profiler with Guice classes

    - by Karussell
    How can I use the profiler from NetBeans 6.8 or 6.9 (choosing 'entire application') with guice enhanced classes? I am using google guice 2.0 (with warp persist 2.0-20090214) for some classes and wanted to profile those classes. But I cannot see a result for those classes. The only result I can see is for one method 'EnhancedClass.access$000' which is not very helpful. Other classes are working. Does somebody know a workaround? Or know what I am doing wrong?

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  • jQuery noob: change border color of element on hover of another element.

    - by Kyle Sevenoaks
    I'd try to explain what I mean, but there is an easier way: click here for jsfiddle example. Basically I want the border color of the div rfrsh_btn to change when productOptionsMenu is hovered over. I'm using jQuery with the .noConflict var because this site also uses Prototype. jQuery: var $j = jQuery.noConflict(); $j(".productOptionsMenu").hover( function () { $j(#rfrsh_btn).css({"border-color":"#85c222"}); }; ); Thanks :)

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  • How do Go web apps function from a server perspective?

    - by Metropolis
    Hey Everyone, I followed the directions on how to create web applications using Go, and I was able to get an application working great. One thing I am confused about though is, when you run the application (./8.out), the terminal will sit there and listen on port 8080 until somebody accesses a page. Does the terminal need to stay up all of the time to run the web application? Does the application act like apache? Does apache need to be run next to this app? Setting this up on a server environment seems very confusing to me right now because I dont understand what the best way to do this is. Thanks for any help on this, Metropolis

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  • How to display CodeRush menu item in VS ?

    - by drasto
    I just installed CodeRush to my VS and when I run VS for the first time after installation it showed me a dialog asking if I'm experienced user. While the dialog was visible I could see that there was new menu item in VS named DevExpress. There was a small check box on that dialog saying something about menu items that I probably should have checked. As I did not the menu items disappeared just after I clicked OK. I cannot make that menu item reappear. Can somebody help me with this ?

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  • USB token with certificate

    - by Frengo
    Hi all! Someone could explain me how the USB token works? I have to implement that secure layer in a java application, but i don't know very well how it works! I know only the mecanism of a normal token key generator! Thanks a lot!

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  • How do I create an NSArray with string literals?

    - by Kyle
    I'm attempting to create an NSArray with a grouping of string literals, however I get the compile error "Initializer element is not constant". NSArray *currencies = [NSArray arrayWithObjects:@"Dollar", @"Euro", @"Pound", nil]; Could someone point out what I'm doing wrong, and possibly explain the error message?

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  • setDelegate explanation

    - by mac
    Hi i am new to iphone developement , can any one explain me , why setDelegate is used, where we should use it. [request setDelegate:sender]; thanks in advance.

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  • Is it posibble to send websocket data over 126 chars?

    - by Udi Talias
    Its seems that everybody says that it is possible to send over 126 chars of data over websocket. I looked at many websocket server examples on the web and non of them can transfer over 126 chars from client to server and from server to client. I understand that it is something with dataframes and opcodes but i never figured it out. I'm using C#. Can somebody please put some light on this subject? any code example for receiving and sending data over 126 chars will be very very thankful

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  • What's the scope of a Python variable declared in an if statement?

    - by froadie
    I'm new to Python, so this is probably a simple scoping question. The following code in a Python file (module) is confusing me slightly: if __name__ == '__main__': x = 1 print x In other languages I've worked in, this code would throw an exception, as the x variable is local to the if statement and should not exist outside of it. But this code executes, and prints 1. Can anyone explain this behavior? Are all variables declared in a module global/available to the entire module?

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  • Decryption with the public key in iphone

    - by vignesh
    Hi all, I have a public key and an encrypted string. I could encrypt with publickey successfully.But when i try to decrypt using the publickey it fails. I mean when i pass the publickey seckeyDecrypt it fails. I have Googled and found out that by default kSecAttrCanDecrypt is false for public keys.So When i import the public key, i have added this particular line , [publicKeyAttr setObject:(id)kCFBooleanTrue forKey:(id)kSecAttrCanDecrypt]; But there is no improvement it still fails. Please somebody help.

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  • Can we find out the difference between 2 RGb colors to find out a 3rd color?

    - by AK
    2 colors are mixed together. If i have the RGB for the resultant color and RGB for one of the colors mixed, then somehow i could calculate the 2nd color? I will try to explain visually what i am trying to say. Here is a flickr link http://www.flickr.com/photos/48150615@N08/4407414157 I know that the circle in the middle has an opacity of 20% Is there any way to know the color value of the circle so that i can deduct that to get the same color value as the background color.

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  • php get future date time

    - by Sanjay
    I don't know how to explain this correctly but just some sample for you guys so that you can really get what Im trying to say. Today is April 09, 2010 7 days from now is April 16,2010 Im looking for a php code, which can give me the exact date giving the number of days interval prior to the current date. I've been looking for a thread which can solve or even give a hint on how to solve this one but I found none.

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  • Java and Different Types of Stacks

    - by Rarge
    Currently the only stack I know anything about is Vector, I normally use this in place of an array but I understand that there is other types of stacks and they all suit different jobs. The project I am currently working on requires me to be inserting objects in a certain position inside a stack, not always the front of the stack and I am under the impression that a Vector may not be the best class for this job. Could somebody please give me a brief description of the other types of stacks available to me with the Java language and their advantages and disadvantages? Are these names homogeneous? E.g. Are they only used in the Java language or are they used as general terms in Computer Science? Thank you

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  • Use CSS referenced images in JSP pages

    - by Alex
    I am writing a java servlet (struts/JSP etc). I am trying to style a progress bar using CSS in a JSP page but get this error when using chrome's developer tools: Resource interpreted as image but transferred with MIME type text/plain. <%@ include file="../include/css/default.css" % And in the CSS file: background:url(../images/bg_bar.gif) no-repeat 0 0; Could anyone explain why this is and show how I can use this CSS in my page?

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  • More 'Edit' navigation item

    - by lennox_19
    I am using a UITabBarController as well as a UINavigationController on my app. In my UITabBarController I am using more than 5 items so I automatically get the 'More' item. I've managed to add a saving procedure so the order of those items will be kept in case somebody changes the order etc. With 'More' active I get the More navigation controller with the 'Edit' item positioned under my UINavigationController. Both navigation controller are visible. When I click on 'Edit though the More navigation controller disappears and seem to be hiding under my UINavigationController and therefore I can't see/use the 'Done' function to save my new order What did I miss? Cheers

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  • I know I can't say myView.frame.origin.x = val - But why ?

    - by Allisone
    I know that I can't use that myView.frame.origin.x = 25.0; that I have to use instead CGRect myFrame = myView.frame; myFrame.origin.x = 25.0; myView.frame = myFrame; And I'm doing it all the time (f.e. in animations), but I don't know why I must do it that way. I would like to fill that gap in my understanding. Can someone explain ?

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  • xna manual animation

    - by tasyjean
    i want to animate 3d model in xna programmatically ,i tried to transform bones but nothing to happen only the whole model transform not individual bones as i want i read the 3d model by basic model processor so how i do this ? and is there any need to extended model processor like skinnedModelSample please explain the steps

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