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  • Is it safe to make GL calls with multiple threads?

    - by user146780
    I was wondering if it was safe to make GL calls with multiple threads. Basically I'm using a GLUtesselator and was wondering if I could divide the objects to draw into 4 and assign a thread to each one. I'm just wondering if this would cause trouble since the tesselator uses callback functions. Can 2 threads run the same callback at the same time as long as that callback does not access ant global variables? Are there also other ways I could optimize OpenGL drawing using multithreading? Thanks

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  • Threading heap and stack

    - by DJ
    How memory is allocated in case of spawning a new thread, i.e how memory heap, memory stack, and threads are related? I know this is fundamental (.net framework concept) but somehow I am not much aware of this concept.

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  • C# Threading in a method

    - by user177883
    I have the following method : public List<string> someMethod() { // populate list of strings // dump them to csv file //return to output } Question is: i dont want the user to wait for csv dump, which might take a while. If i use a thread for csvdump, will it complete? before or after the return of output?

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  • Prompting for user confirmation before upgrading previous version

    - by bizmark
    Using WiX, we would like to be able to uninstall a previous version if it is already installed. I am able to do this automatically based on the thread here. But how does one go about prompting the user if they actually want to uninstall the old version first, before running the RemoveExistingProducts action? ie. through a custom menu item that only launches if FindRelatedProducts returns 1, for example?

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  • MS SQL tuning tools for finding overload

    - by SkyFox
    I use MS SQL server as a DBMS for my very big corporate DB (with different financial data). And some times my system go down. I don't understand why. What programs/tools I can use for finding process/program/thread, that overload my SQL-server? Thanks for all answers!

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  • managedObjectContext question...

    - by treasure
    Hello, I have an app which is a UITabBarController, I have defined two subviews Both tabs have their Class attribute in the Identity Inspector set to UINavigationController. Now i have managed to get this far with my coding after VERY LONG trials. - (void)viewDidLoad { [super viewDidLoad]; myAppDelegate *appDelegate = (myAppDelegate *)[[UIApplication sharedApplication] delegate]; self.managedObjectContext = appDelegate.managedObjectContext; { NSError *error = nil; NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; [fetchRequest setEntity:[NSEntityDescription entityForName:@"User" inManagedObjectContext:self.managedObjectContext]]; NSArray *fetchedItems = [self.managedObjectContext executeFetchRequest:fetchRequest error:&error]; NSEntityDescription *entityDesc = [NSEntityDescription entityForName:@"User" inManagedObjectContext:self.managedObjectContext]; // replace the old data with new. this DOESNT WORK if (fetchedItems.count > 0) { Usr *newUsr; for (newUsr in fetchedItems) { if ([newUsr.name isEqualToString:@"Line One"]) { newUsr.uName = @"Line One (new)"; } } } //add a new default data. THIS ADDS DATA TO MY TABLEVIEW BUT IT DOESNT SAVE THEM TO THE SQLITE User *addedDefaultdata = nil; addedDefaultdata = [[User alloc] initWithEntity:entityDesc insertIntoManagedObjectContext:self.managedObjectContext]; addedDefaultdata.name = @"Added new 1"; [addedDefaultdata release]; } NSError *error = nil; if (![[self fetchedResultsController] performFetch:&error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } } and my appdelegate looks like this: - (void)applicationDidFinishLaunching:(UIApplication *)application { [application setStatusBarStyle:UIStatusBarStyleBlackOpaque]; [window addSubview:navigationController.view]; [window makeKeyAndVisible]; } now I cannot quire the "User" at all! although i get no errors or warnings! Any suggestions would be much appreciated! Thanks

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  • C# empty statement

    - by dotnetdev
    In C#, I can write something like: using (new MyDisposableClass().MethodA()); The semicolon causes a compiler warning to be shown which states possible mistaken empty statement. I haven't run the above code but won't the method still be called? What uses is there of this type of coding convention? I saw another thread on here about this but I ask in case there areny differences now/therefore different replies. Thanks

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  • Pickled my dictionary from ZODB but i got a less in size one?

    - by Someone Someoneelse
    I use ZODB and i want to copy my 'database_1.fs' file to another 'database_2.fs', so I opened the root dictionary of that 'database_1.fs' and I (pickle.dump) it in a text file. Then I (pickle.load) it in a dictionary-variable, in the end I update the root dictionary of the other 'database_2.fs' with the dictionary-variable. It works, but I wonder why the size of the 'database_1.fs' not equal to the size of the other 'database_2.fs'. They are still copies of each other. def openstorage(store): #opens the database data={} data['file']=filestorage data['db']=DB(data['file']) data['conn']=data['db'].open() data['root']=data['conn'].root() return data def getroot(dicty): return dicty['root'] def closestorage(dicty): #close the database after Saving transaction.commit() dicty['file'].close() dicty['db'].close() dicty['conn'].close() transaction.get().abort() then that's what i do:- import pickle loc1='G:\\database_1.fs' op1=openstorage(loc1) root1=getroot(op1) loc2='G:database_2.fs' op2=openstorage(loc2) root2=getroot(op2) >>> len(root1) 215 >>> len(root2) 0 pickle.dump( root1, open( "save.txt", "wb" )) item=pickle.load( open( "save.txt", "rb" ) ) #now item is a dictionary root2.update(item) closestorage(op1) closestorage(op2) #after I open both of the databases #I get the same keys in both databases #But `database_2.fs` is smaller that `database_2.fs` in size I mean. >>> len(root2)==len(root1)==215 #they have the same keys True Note: (1) there are persistent dictionaries and lists in the original database_1.fs (2) both of them have the same length and the same indexes.

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  • Track user with log4net for a website

    - by Xstahef
    Hi, I am searching for the best way for track user on a web site based on asp.net. We are using log4net to log some business actions (enter on this page, click on button, etc.). But for multiple users, log file cannot be read easily. So I need add a property 'UserName' on the config file like this : <conversionPattern value="%date [%thread] - %property{UserName} - %-5level - %logger - %message%newline"/> Do you hae any idea about the way to set 'UserName' ? thanks for your help

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  • Android segmented downloading

    - by xRev
    I'm still new to Android, so, I'm still not so familiar with its libraries and APIs. My first major project is a download manager which supports segmented downloading. I could already download files, but, I still have no idea on how or where to start for segmented downloading. I have already browsed a lot of threads, but I really couldn't find any article or thread about segmented downloading in Android. Can anyone please help me?

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  • Bad idea to force creation of Mercurial remote heads (ie. branches)?

    - by Chad Johnson
    I am developing a centralized web application, and I have a centralized Mercurial repository. Locally I created a branch in my repository hg branch my_branch I then made some changes and committed. Then when I try to push, I get abort: push creates new remote branch 'my_branch'! (did you forget to merge? use push -f to force) I've just been using push -f. Is this bad? I WANT multiple branches in my central, remote repository, as I want to 1) back up my work and 2) allow other developers to develop with me on that branch. Is it bad or something to have branches in my remote repository or something? Should I not be doing push -f (and if not, what should I do?)? Why does Joel say this in his tutorial: Occasionally I've made a change in a branch, pushed, switched to another branch, and changes I had made in that branch I switch to were mysteriously reverted to a previous version from several commits ago. Maybe this is a symptom of forcing a push?

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  • Random number in a loop

    - by Sam
    Hi all, having an issue generating random numbers in a loop. Can get around it by using Thread.Sleep but after a more elegant solution. for ... Random r = new Random(); string += r.Next(4); Will end up with 11111... 222... etc. Suggestions?

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  • Missing $ on loop variable

    - by k0re
    Hi, 1 #!/usr/bin/perl 2 use strict; 3 use warnings; 4 5 my @array = qw[a b c]; 6 foreach my($a,$b,$c) (@array) { 7 print "$a , $b , $c\n"; 8 } I receive following error: Missing $ on loop variable What is wrong? I am using: perl v5.10.1 (*) built for x86_64-linux-thread-multi

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  • How do I map to a parent or child in the same table with NHibernate?

    - by adolfojp
    Lets suppose that I have a Category table with a column that holds the id of a parent or child category from the same table. This design would allow me to have unlimited levels of Categories, or unlimited levels in a thread, for example. How can I map this relationship with NHibernate? Are there any disadvantages or warnings that I should take into consideration when doing this?

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  • Getting a `free()` error when deallocating with `delete` in the backtrace

    - by wonko
    I got the following error from gdb: *** glibc detected *** /.root0/autohome/u132/hsreekum/ipopt/ipopt/debug/Ipopt/examples/ex3/ex3: free(): invalid next size (fast): 0x0000000120052b60 *** Here's the backtrace: #0 0x000000555626b264 in raise () from /lib/libc.so.6 #1 0x000000555626cc6c in abort () from /lib/libc.so.6 #2 0x00000055562a7b9c in __libc_message () from /lib/libc.so.6 #3 0x00000055562aeabc in malloc_printerr () from /lib/libc.so.6 #4 0x00000055562b036c in free () from /lib/libc.so.6 #5 0x000000555561ddd0 in Ipopt::TNLPAdapter::~TNLPAdapter () from /home/ba01/u132/hsreekum/ipopt/ipopt/build/lib/libipopt.so.1 #6 0x00000055556a9910 in Ipopt::GradientScaling::~GradientScaling () from /home/ba01/u132/hsreekum/ipopt/ipopt/build/lib/libipopt.so.1 #7 0x00000055557241b8 in Ipopt::OrigIpoptNLP::~OrigIpoptNLP () from /home/ba01/u132/hsreekum/ipopt/ipopt/build/lib/libipopt.so.1 #8 0x00000055556ae7f0 in Ipopt::IpoptAlgorithm::~IpoptAlgorithm () from /home/ba01/u132/hsreekum/ipopt/ipopt/build/lib/libipopt.so.1 #9 0x0000005555602278 in Ipopt::IpoptApplication::~IpoptApplication () from /home/ba01/u132/hsreekum/ipopt/ipopt/build/lib/libipopt.so.1 #10 0x0000005555614428 in FreeIpoptProblem () from /home/ba01/u132/hsreekum/ipopt/ipopt/build/lib/libipopt.so.1 #11 0x0000000120001610 in main () at ex3.c:169` And here's the code for Ipopt::TNLPAdapter::~TNLPAdapter () TNLPAdapter::~TNLPAdapter() { delete [] full_x_; delete [] full_lambda_; delete [] full_g_; delete [] jac_g_; delete [] c_rhs_; delete [] jac_idx_map_; delete [] h_idx_map_; delete [] x_fixed_map_; delete [] findiff_jac_ia_; delete [] findiff_jac_ja_; delete [] findiff_jac_postriplet_; delete [] findiff_x_l_; delete [] findiff_x_u_; } My question is : why does free() throw an error when ~TNLPAdapter() uses delete[]? Also, I would like to step through ~TNLPAdapter() so I can see which deallocation causes the error. I believe the error occurs in the external library (IPOPT) but I have compiled it with debug flags on ; is this sufficient?

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  • The device is not connected exception

    - by Dani
    I try to open a large number of files but after 5000 files or so I get Exception in thread "Main" java.io.IOException: The device is not connected Is this the expected behavior? Is there a way around it? I want to leave my code as straightforward as possible.

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  • Debugging asp.net suddenly stops

    - by Lieven Cardoen
    I have a strange error. I'm debugging an asp.net site and suddenly it stops. Visual Studio stays in debug mode and my web application stays on running just fine. I found this post on, but I don't think a background thread is causing the problem. There's even a try catch around the code where it usually stops debugging, but the catch is not triggered... Everytime I try it, it stops at a different place in the code.

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