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  • How is dynamic memory allocation handled when extreme reliability is required?

    - by sharptooth
    Looks like dynamic memory allocation without garbage collection is a way to disaster. Dangling pointers there, memory leaks here. Very easy to plant an error that is sometimes hard to find and that has severe consequences. How are these problems addressed when mission-critical programs are written? I mean if I write a program that controls a spaceship like Voyager 1 that has to run for years and leave a smallest leak that leak can accumulate and halt the program sooner or later and when that happens it translates into epic fail. How is dynamic memory allocation handled when a program needs to be extremely reliable?

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  • How should I manage data in an 2D vector based animation program?

    - by shadow
    I've been trying to design a program that makes 2D animations and then uses the ffmpeg library to create the video for possible use in tv and movies. The problem is when I think about how to manage the data in the application I can only think of two ways, I don't think either of them will work out very well. One is to use an SQlite database, but it seems like it will be difficult to save, especially if an artist puts 1000 things on screen. The other is to use something like linked lists, which would duplicate many features of the database and get complicated when dealing with things like points on a bezier curve and jumping to a frame and collecting all the objects that need to be drawn on that frame. Should I use one of these solutions, or is there something else that would be better? Currently planning to use C# for code.

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  • [CFArray release]: message sent to deallocated instance

    - by arielcamus
    Hi, I'm using the following method in my code: - (NSMutableArray *) newOrderedArray:(NSMutableArray *)array ByKey:(NSString *)key ascending:(BOOL)ascending { NSSortDescriptor *idDescriptor = [[NSSortDescriptor alloc] initWithKey:key ascending:ascending]; NSArray *sortDescriptors = [NSArray arrayWithObject:idDescriptor]; NSArray *orderArray = [array sortedArrayUsingDescriptors:sortDescriptors]; [idDescriptor release]; NSMutableArray *result = [NSMutableArray arrayWithArray:orderArray]; return result; } Is this a well-coded convenience method? As I think, it returns an autoreleased NSMutableArray. This method is called by another one: - (id) otherMethod { NSMutableArray *otherResult = [[[NSMutableArray alloc] initWithCapacity:[otherArray count]] autorelease]; // I add some stuff to otherResult and then... NSMutableArray *result = [dbUtils newOrderedArray:otherResult ByKey:@"objectId" ascending:NO]; return result; } This method (otherMethod) is called in some view controller where I want to store returned array and release it when deallocating the view controller. However, when [result retain] is called in this view controller (because I need it to be available and I can't allow it to be deallocated) I receive the following error: [CFArray release]: message sent to deallocated instance I've tried to log [result retainCount] just before calling retain and it print "1". I don't understand why an error is thrown when calling retain. Thank you, A

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  • What are the Worst Software Project Failures Ever?

    - by Warren P
    Is there a good list of "worst software project failures ever" in the history of software development? For example in Canada a "gun registry" project spent around two billion dollars. (http://en.wikipedia.org/wiki/Gun_registry). This is of course, insane, even if the final product "sort of worked". I have heard of an FBI Case file system which there have been several attempts to rewrite, all of them so far, failures. There is a book on the subject (Software Runaways). There doesn't seem to be be a software "boondoggle" list or "fiasco" list on Wikipedia that I can see. (Update: Therac-25 would be the 'winner' of this question, except that I was internally thinking more of Software projects that had as their deliverable, mainly software, as opposed to firmware projects like Therac-25, where the hardware and firmware together are capable of killing people. In terms of pure software monetary debacles, which was my intended question, there are several contenders.)

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  • Branch by abstraction: Are there "examples" of how it can be done?

    - by Philipp Keller
    Having read Martin Fowlers "Feature Branch" and Flickrs "Flipping Out" (http://www.liip.to/flippingout) I guess there are a few guys out there who do: all (or most) development on Trunk release Trunk regularly (assuming updating your web site) not-yet-approved or not-yet-finished features should not be visible/have no impact on the regular user I've got 2 questions: granted - Flickr's article seems to work for "frontend code". But how is it cleaned up? Don't the ifs pile up? how does this work for the more "backend part"? Thinking of database changes, or model refactoring. Working with ifs doesn't seem to work - and copy-pasting classes for small adaptions also seems awkward. Are there any articles out there answering these 2 questions?

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  • Dealing with UIImagePickerController to minimize memory useage

    - by Gordon Fontenot
    So, I have read the SO post on UIImagePickerController, UIImage, Memory and More, and I read the post on Memory Leak Problems with UIImagePickerController in iPhone. I have VASTLY increased my memory efficiency between these 2 posts, and I thank the OPs and the people that provided the answers. I just had a question on the answer provided in the Memory Leak question, which was (essentially): only have one instance of the controller throughout the programs runtime What would be the best way to go about this without causing memory leaks? Right now I am initiating it and releasing it on every use from within the view, and I am seeing exactly what the answer describes (Memory warnings and a crash after about 20 uses). Should I initiate the UIImagePickerController when I need it, but use a seperate class unrelated to the view to control it? How should I deal with releasing the controller if I do it this way?

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  • Is it acceptible to expect mentoring to replace many years experience?

    - by Mantorok
    Hi all Just a quick question Here's my situation: I've been maintaining, extending and creating websites against a CMS for the last 18 months In that time I've learnt a LOT more about ASP.Net, javascript, and of course the quirks of the CMS we are using My manager wants to get others involved, and I'm expected to mentor another programmer whilst they work on production code Now, I've got no problem mentoring someone and it would be great for me to not be the only one with the skillset. But what I HAVE got a problem with is mentoring someone within an agreed timescale of the piece of work (10 days in this case) AND expected to deliver the product to the same standard. I guess what I'm getting at is: 18 months experience != a few days mentoring, not to mention the level of C#/.Net/ASP.Net/Javascript required may also not be up to scratch. Am I right to think this is a little, wrong?

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  • Internal bug tracking tickets - Redmine, Trac, or JIRA

    - by Tai Squared
    I've been looking at setting up Redmine, Trac, or JIRA to track issues. I want to be able to have my development team create internal tickets that are never seen by clients, while clients can create/edit tickets that are seen by the internal team. From the Trac documentation, you can set permissions to create or view tickets, but it doesn't seem to allow for viewing only certain tickets. It may be possible with Trac Fine Grained Permissions, but doesn't appear so. The Redmine documentation mentions: Define your own roles and set their permissions in a click but doesn't appear to have the level of granularity. From the JIRA documentation: At the moment JIRA is only able to support security at a project level or issue level. Currently there is no field level security available. According to this question, Redmine doesn't support internal tickets, so you would have to use multiple projects. I don't want a situation where I would have to create multiple projects - one internal, one external and have the external tickets brought into the internal repository. It seems as this would lead to unnecessary overhead and inevitably, the projects wouldn't be in sync. Is there any way with any of these products (possibly through a plug-in if not in the core product itself) to specify these permissions, or simplify having two projects with different users and permissions that must still share information?

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  • nedmalloc: where does mem<fm come from?

    - by Suma
    While implementing nedmalloc into my application, I am frequently hitting a situation when nedmalloc refuses to free a block of memory, claiming it did not allocate it. While debugging I have come up to the point I see a particular condition which is failing, all other (including magic numbers) succeed. The condition is this: if((size_t)mem-(size_t)fm>=(size_t)1<<(SIZE_T_BITSIZE-1)) return 0; On Win32 this seems to be equivalent to: if((int)((size_t)mem-(size_t)fm)<0) return 0; Which seems to be the same as: if((size_t)mem<(size_t)fm) return 0; In my case I really see mem < fm. What I do not understand now is, where does this condition come from. I cannot find anything which would guarantee the fm <= m anywhere in code. Yet, "select isn't broken": I doubt it would really be a bug in nedmalloc, most likely I am doing something wrong somewhere, but I cannot find it. Once I turn debugging features of nedmalloc on, the problem goes away. If someone here understands inner working of nedmalloc, could you please explain to me why is fm <= m?

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  • .Net: Prevent an object from being paged out (VirtualLock equivalent)

    - by Gene
    How would one go about keep an object in memory such that it won't be paged out by the OS in .Net? i.e. Something similar to VirtualLock, but operating on an object, such that if compacting occurs and the object is moved it still would not be paged out, etc.. (I suppose one could pin the object's, determine what pages it belongs to, and then VirtualLock those pages, but that seems non-desireable for many reasons.) If possible, could you point me to a reference or working sample? (C# ideally) Many thanks in advance!

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  • why pointer to pointer is needed to allocate memory in function

    - by skydoor
    Hi I have a segmentation fault in the code below, but after I changed it to pointer to pointer, it is fine. Could anybody give me any reason? void memory(int * p, int size) { try{ p = (int *) malloc(size*sizeof(int)); } catch( exception& e) { cout<<e.what()<<endl; } } it does not work in the main function as blow int *p = 0; memory(p, 10); for(int i = 0 ; i < 10; i++) p[i] = i; however, it works like this . void memory(int ** p, int size) { `//pointer to pointer` try{ *p = (int *) malloc(size*sizeof(int)); } catch( exception& e) { cout<<e.what()<<endl; } } int main() { int *p = 0; memory(&p, 10); //get the address of the pointer for(int i = 0 ; i < 10; i++) p[i] = i; for(int i = 0 ; i < 10; i++) cout<<*(p+i)<<" "; return 0; }

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  • Object allocate and init in Objective C

    - by Ronnie Liew
    What is the difference between the following 2 ways to allocate and init an object? AController *tempAController = [[AController alloc] init]; self.aController = tempAController; [tempAController release]; and self.aController= [[AController alloc] init]; Most of the apple example use the first method. Why would you allocate, init and object and then release immediately?

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  • .NET out of memory troubleshooting

    - by bushman
    After reading a few enlightening articles about memory in the .NET technology, Out of Memory does not refer to physical memory, 597499. I thought I understood why a C# app would throw an out of memory exception -- until I started experimenting with two servers-- both are having 2.5 gigs of ram, windows server 2003 and identical programs running. The only significant difference between the two being one has 7% hard drive storage left and the other more than 50%. The server with 7% storage space left is consistently throwing an out of memory while the other is performing consistently well. My app is a C# web application that process' hundreds of MBs of String object. Why would this difference happen seeing that the most likely reason for the out of memory issue is out of contiguous virtual address space -- What solutions do you guys propose -- and what do you say about the following 1. turn on the 3gb switch to increase the virtual address space -- 2. instead of using one giant string object, break it up into smaller pieces and collect it in a jagged array (here I have to find a way to return to the caller in some other way as right now, the return type is a string) thanks SO

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  • NSMutableDictionary memory / address problem, release does not work?

    - by phil
    I am trying to create a NSMutableDictionary(dictA) with objectA. When I try to view my dictionary(NSLog), each key is pointing to the same address. I have an objectA_1 which is type objectA and used to setup the dictionary. Also, if I try to getObject, I always get the last key/value that was added to the dictionary. I tried setValue and got the same results. Is there something wrong with my objectA? Is the release method not working properly? Am I retaining when I shouldn't? Thank you. dictA = [[NSMutableDictionary alloc] init]; objectA *objectA = [[objectA alloc] init]; [dictA setObject:objectA_1 forKey:@"apple"]; [objectA_1 release]; [dictA setObject:objectA_1 forKey:@"japan"]; [objectA_1 release]; [dictA setObject:objectA_1 forKey:@"paris"]; [objectA_1 release]; [dictA setObject:objectA_1 forKey:@"pizza"]; [objectA_1 release]; //NSlog: apple = ""; japan = ""; paris = ""; pizza = "";

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  • There are lots of useful answers about estimating the cost of a project. Are there any recommendatio

    - by Chrys
    Let me clarify this a bit more. I started giving estimations about projects/tasks. I write everything down in a spreadsheet. I know that soon this spreadsheet won't help much (searching, recommending similar project estimations etc...) Do you have any recommendations for any tools I can use for keeping a track of all these estimations? Is there a tool out there that for example will give me related project estimations like stackoverflow gives me related questions when I type one question.

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  • When do you tag your software project?

    - by WilhelmTell of Purple-Magenta
    I realize there are various kinds of software projects: commercial (for John Doe) industrial (for Mr. Montgomery Burns) successful open-source (with audience larger than, say, 10 people) personal projects (with audience size in the vicinity of 1). each of which release a new version of their product on difference conditions. I'm particularly interested in the case of personal projects and open-source projects. When, or under what conditions, do you make a new release of any kind? Do you subscribe to a fixed recurring deadline such as every two weeks? Do you commit to a release of at least 10 minor fixes, or one major fix? Do you combine the two conditions such as at least one condition must hold, or both must hold? I reckon this is a subjective question. I ask this question in light of searching for tricks to keep my projects alive and kicking. Sometimes my projects are active but look as if they aren't because I don't have the confidence to make a release or a tag of any sort for a long time -- in the order of months.

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  • Agile and code release

    - by ring bearer
    Do you know of any agile process that is created for code releases? One of the main theme of agile is frequent releases and each company/client would have their own test/approval processes that control code releases. Most of the time these slow down the pace of "frequent releases" Currently we have a proprietary tool based workflow. The team who needs a code promotion needs to create a promotion request to one of the final UAT servers. Once this is complete, and once tests are done, certain customers, technical/non-technical managers need to approve, then it goes in to production deploy stage. Meanwhile no sprint planning meeting or anything of that sort. What is the code release process (Which is agile) that has worked for you?

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  • Android: How to restore List data when pressing the "back" button?

    - by Rob
    Hi there, My question is about restoring complex activity related data when coming back to the activity using the "back" button". Activity A has a ListView which is connected to ArrayAdapter serving as its data source - this happens in onCreate(). By default, if I move to activity B and press "back" to get back to activity A, does my list stay intact with all the data or do I just get visual "copy" of the screen but the data is lost? What can I do when more than activities are involved? Let's say activity A starts activity B which starts activity C and then I press "back" twice to get to A. How do I ensure the integrity of the A's data when it gets back to the foreground? PrefsManager does not seem to handle complex object very intuitively. Thanks, Rob

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  • Solving iPhone/iPad out of memory issues

    - by Joonas Trussmann
    I have a strange issue where I'm scrolling through a paged UIScrollView which displays the pages of a PDF document (using Quartz 2D and CATiledLayer). When I page through memory allocation looks fine with it going up with a few initial pages and then keeping it steady as it obviously releases the memory kept for earlier pages. Upon hitting page x (not a certain PDF page or a certain number per se) memory usage goes from a couple of megs to 308 megs and the app crashes. So my question is: how to best try to find what's causing this? The object alloc tool in instruments shows the memory as simply going to malloc. (in huge chunks).

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  • dev and prod systems in rails

    - by poseid
    What exactly is the difference in rails between dev and prod environments. When I develop an application in dev mode, do I have peformance problems, or others if I clone my dev environment on prod?

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