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  • Is pthread_spin_trylock safe inside of sigsegv handler of multithreaded application?

    - by TWMouton
    I am trying to implement a handler that on SIGSEGV will collect some information such as process-id, thread-id and a backtrace and write this information to a file/pipe/socket. The problem lies in that there is the (probably pretty high) possibility that if one thread experienced a SIGSEGV that the others will shortly follow. If two threads happen to make it to the bit of code where they're writing their report out at the same time then they'll interleave their writing (to the same file). I know that I should only be using async-signal-safe functions as detailed in signal(7) I also have seen at least two cases here and video linked in top answer here where others have used pthread_spin_trylock to get around this problem. Is this a safe way to prevent the above problem?

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  • Error in tunneling service on VMC

    - by user1627058
    I've push an app to my CF on cloud_controller paas.azure4j.us with uri yamashowcase.azure4j.us . When I tried to create tunnel on service which binded to it an error occured like this : toriq@meruvian354:~$ sudo vmc tunnel yamashowcase-db Stopping Application 'caldecott': OK Redeploying tunnel application 'caldecott'. Uploading Application: Checking for available resources: OK Packing application: OK Uploading (1K): OK Push Status: OK Binding Service [yamashowcase-db]: OK Staging Application 'caldecott': OK Starting Application 'caldecott': OK Getting tunnel connection info: ..........Error: Expected remote tunnel to know about yamashowcase-db, but it doesn't I use vmc version 0.3.23 . Any solution for this ??

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  • I want to make my desktop application available online - how?

    - by Ami
    I have a few years experience programming c++ and a little less then that using Qt. I built a data mining software using Qt and I want to make it available online. Unfortunately, I know close to nothing about web programming. Firstly, how easy or hard is this to do and what is the best way to go about it? Supposing I am looking to hire someone to make me a secure, long-term, extensible, website for an online software service, what skill set should I be looking for?

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  • Location-aware applications on WP7.5

    - by salamis
    I would like to create a location-aware application on WP7.5 Is it possible to automatically get a trigger on location change without our application running on background? For example: I would like to know if a user has moved in a new location. If the user has moved I would like to trigger a specific event from my application. My only concern is that if I do that from my application I will consume a significant amount of battery. Is it a specific WP7 service which can inform my application that the user has changed his location and trigger an event from my application? If it is possible can you please point me an example?

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  • How can two instances of an application communicate in Java?

    - by shubhkarman
    Hello, I am developing a new Java Desktop app. Something like a media player. I want to load most of the resources in the background when the computer starts up. But the users can turn this option off form within the app or using some other utility. So, what I want to do is if a ban instance of the app is already running and the user starts the app again then I can communicate with the already running instance so that it can launch a new window?

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  • Can I have an android activity run only on the first time an application is opened?

    - by The Trav
    OK, so I'm playing around with an android app. The 90% use case is that users want to go straight to the primary list screen to find what they're looking for. That's what I want as my default screen. The first time a user loads the app however, some configuration is required before their list screen is of any value to them. So my question, is how I can go about displaying the configuration activity the first time the app is opened up, and then the list screen for future openings. I also want to put a demo button on the configuration screen, so I suppose more than just detecting that it's the first time, I specifically want to detect whether the user has performed certain configurations within the first screen.

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  • How to add sub category on my codeigniter php application ?

    - by sagarmatha
    Hello friends I have a view echo "<label for='parent'>Category</label><br/> "; echo form_dropdown('category_id', $categories). "<p>"; controller function create(){ if($this->input->post('name')){ $this->MProducts->addProduct(); $this->session->set_flashdata('message', 'Products Created'); redirect('admin/products/index', 'refresh'); }else{ $data['title'] = "Create Product"; $data['main'] = 'admin_product_create'; $data['categories']= $this->MCats->getTopCategories(); $this->load->vars($data); $this->load->view('dashboard'); } } and the model is function getTopcategories(){ $data = array(); $data[0] = 'root'; $this->db->where('parentid',0); $Q = $this->db->get('categories'); if($Q->num_rows() > 0){ foreach($Q->result_array() as $row){ $data[$row['id']] = $row['name']; } } $Q->free_result(); return $data; } Basically, what i want is we get sub categories when we click categories and 'selected' subcategory id goes to database when we create products, So that we can list products by sub categories. Please help me how do we do that ?

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  • [C#] Implementing different windows/forms in a Windows Mobile application?

    - by pbean
    I am a bit new to Windows Mobile (with C# and the compact framework) development, so I am kind of unsure how to do this. The user has to go through several pages of information in a wizard-like manner. At the start there is a login window. How would I go about and implement this? Would I just have different User Controls for each page and create/show and destroy/hide them on request? Or do I need to create different forms and somehow show those?

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  • Can two different versions of the same libs (with same name) exists in an application?

    - by Jay
    I have some scenario like this: Product- Platform- mylibs(version-1) Product- mylibs(version-2) i.e Product uses mylibs (version-2) directly. Product also uses platform (which is also a dynamic lib) and platform uses my libs (version-1). The names of the libs used by product and platform are same. Only versions are different and both these versions are not compatible. Is there a way with ".so" libs in linux that Platform can link to one version and product can link to another version of the same libs having the same name?

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  • how to get http responses continuously to a java application?

    - by senrulz
    I have the coding shown below where I have sheduled to get a http response from a php web server page. public static void stopPHPDataChecker() { canStop=true; } public static void main (String args[]) { // http request to the php page and get the response PHPDataChecker pdc = new PHPDataChecker(); ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1); final ScheduledFuture<?> pdcHandle = scheduler.scheduleAtFixedRate(pdc, 0L, 10L, TimeUnit.MILLISECONDS);// Start schedule scheduler.schedule(new Runnable() { public void run() { System.out.println(">> TRY TO STOP!!!"); pdcHandle.cancel(true); Sheduler.stopPHPDataChecker(); System.out.println("DONE"); } }, 1L, TimeUnit.MILLISECONDS); do { if (canStop) { scheduler.shutdown(); } } while (!canStop); System.out.println("END"); } this coding only returns one response but I want it to get responses continuously so i can do different tasks according to the returned value. how can i do it? Thank you in advance :)

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  • Why doesn’t Office-applications get focus when run from another application on Win 2008?

    - by JohanK
    I have some different COM-Interop examples that when run on Windows 2008 (Office 2007) always open minimized in the task bar. On Windows 2003 or XP they open like I want them to. Has there been any changes to how Windows deals with this? Or to Office? I know that I can close windows with CTRL-SHIFT-ALT, and by that get them to start maximized next time, but for some dialogs this doesn’t work. Is there any way to make them always open maximized or on top? Any clues that could point me in the right direction would be helpful. I have tried with both our VB6 app and a test app in C#.

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  • Web Matrix released

    - by TATWORTH
    Microsoft have now released Web Matrix (and ASP.NET MVC3 if you so inclined!) One signifcant utility is IIS Express which will replace Cassini It is worth noting that SP1 for VS2010 should be out in Q1. Links: http://www.hanselman.com/blog/ASPNETMVC3WebMatrixNuGetIISExpressAndOrchardReleasedTheMicrosoftJanuaryWebReleaseInContext.aspx http://www.hanselman.com/blog/LinkRollupNewDocumentationAndTutorialsFromWebPlatformAndTools.aspx http://arstechnica.com/microsoft/news/2011/01/microsoft-releases-free-webmatrix-web-development-tool.ars I am impressed by the copious tutorials on MVC, which I include below: Intro to ASP.NET MVC 3 onboarding series. Scott Hanselman and Rick Anderson collaboration and Mike Pope (Editor) Both C# and VB versions: Intro to ASP.NET MVC 3 Adding a Controller Adding a View Entity Framework Code-First Development Accessing your Model's Data from a Controller Adding a Create Method and Create View Adding Validation to the Model Adding a New Field to the Movie Model and Table Implementing Edit, Details and Delete Source code for this series MVC 3 Updated and new tutorials/ API Reference on MSDN Rick Anderson (Lead Programming Writer), Keith Newman and Mike Pope (Editor) ASP.NET MVC 3 Content Map ASP.NET MVC Overview MVC Framework and Application Structure Understanding MVC Application Execution Compatibility of ASP.NET Web Forms and MVC Walkthrough: Creating a Basic ASP.NET MVC Project Walkthrough: Using Forms Authentication in ASP.NET MVC Controllers and Action Methods in ASP.NET MVC Applications Using an Asynchronous Controller in ASP.NET MVC Views and UI Rendering in ASP.NET MVC Applications Rendering a Form Using HTML Helpers Passing Data in an ASP.NET MVC Application Walkthrough: Using Templated Helpers to Display Data in ASP.NET MVC Creating an ASP.NET MVC View by Calling Multiple Actions Models and Validation in ASP.NET MVC How to: Validate Model Data Using DataAnnotations Attributes Walkthrough: Using MVC View Templates How to: Implement Remote Validation in ASP.NET MVC Walkthrough: Adding AJAX Scripting Walkthrough: Organizing an Application using Areas Filtering in ASP.NET MVC Creating Custom Action Filters How to: Create a Custom Action Filter Unit Testing in ASP.NET MVC Applications Walkthrough: Using TDD with ASP.NET MVC How to: Add a Custom ASP.NET MVC Test Framework in Visual Studio ASP.NET MVC 3 Reference System.Web.Mvc System.Web.Mvc.Ajax System.Web.Mvc.Async System.Web.Mvc.Html System.Web.Mvc.Razor

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