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  • Admin mode on Procurve Switches

    - by stefan.at.wpf
    Not being a network expert, I spent some time configuring my network, until I found my mistake: On my HP ProCurve Switch 1810G, I thought that "Admin mode" means whether the administrative interface can be accessed from this port. Well, it means whether the port is enabled or not. Extract from the help function: Admin Mode - Select to enable the port-control administration state. Click to enable and have the port participate in the network.(Default : Enabled ) Well, of course I didn't read the help, because I didn't doubt it's for the adminsitrative interface and suspected an error somewhere else. Anyway, I am wondering if that is a commonly used term for enabling/disabling ports or if HP just wanted to make my life harder? I can't understand why this option isn't just called "Enable port"!? Here's a screenshot of how it looks in the web interface (yeah, shame on me for using a web interface)

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  • Puppet performance compared to cfengine

    - by Andy
    I'm considering using Puppet or cfengine. Key factors are performance, and research on the internet suggests cfengine uses less memory and CPU cycles compared to puppet. However, puppet seems easier to use. I need to manage several web servers, as well as handheld tablets and machines that will only connect to some central control servers periodically. All are Linux machines. Would I be able to use either puppet or cfengine for this? And if so, does puppet still make poor use of resources? I'd like to use puppet because it seems simpler, but a lot of the articles I've found refer to cfengine 2 - is cfengine 3 easier to configure? Thanks

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  • Unable to connect to another computer from the Task Scheduler on Windows 7

    - by Clem
    I am getting the following error when trying to connect to another computer from the Task Scheduler on Windows 7: "The remote computer was not found." The computer that I am trying to connect to is definitely on the network as I can ping it and browse its shared folders in Windows Explorer. Note that I get the same error message when trying to perform the same operation from Performance Monitor. This suggests that I need to something to enable remote connection to the Task Scheduler. I am not very experienced with Windows administration and I am not sure where to look. To give a bit more context, I want to use the Task Scheduler to automatically start Perf Mon on a few machines at my company. I'd like to setup the Task Scheduler remotely. Does anyone know what I need to do?

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  • Changing Administrator password on a Windows 2008 web server

    - by Nick
    I've just taken over the administration of a Windows 2008 web server from a previous employee on a temporary basis. I need to change the Admin password as soon as I can but I've noticed that quite a few of the services also run under this account. So: Is there a quick way to find out which services will be affected by me changing the password or is it a question of going down the list? It doesn't seem right to me that the Admin account is used in this manner; should I create a different account for these services, or is using the Admin a/c standard practice? I realize everyone's servers / networks are set up differently, but are there any other items I should be aware of when changing the Admin password? Thanks

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  • Using Zentyal to control several servers

    - by user1301428
    I am currently in the process of creating a home server, made up of several virtual machines, each running a different type of server (i.e. a file server, a multimedia server, a firewall and a print server as of now). Today I discovered this new software, Zentyal, which looks interesting for system and network administration. However, I haven't understood one thing: can it be used only with its preconfigured packages or can it also be used to control other servers running other programs (in my case, the four virtual machines)?. Also, would you suggest to use such a program or do you think it's better to control each server on its own?

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  • L'administration américaine s'intéresse à BlackBerry 10 après un virage vers l'iPhone, l'année 2013 sera-t-elle celle de RIM ?

    RIM : l'administration américaine s'intéresse à BlackBerry 10 Après avoir fait un virage vers l'iPhone, l'année 2013 sera-t-elle celle du constructeur canadien ? L'année 2013 sera-t-elle celle du renouveau pour RIM ? Sans jouer les oracles, l'arrivée de BlackBerry 10 et de sa nouvelle plateforme de développement sont des signes encourageants pour le Canadien. Depuis hier, un autre signe va dans le même sens. Alors que l'administration américaine avait décidé de s'ouvrir à l'iPhone au détriment des seuls BlackBerry (souvenez-vous, le téléphone était par exemple le préféré de Barack Obama lors de sa première élection), voilà que la nouvelle version de l'OS et ses fonctionnali...

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  • L'administration américaine s'intéresse à BlackBerry 10 après un virage vers l'iPhone, l'année 2013 pourrait-elle être celle de RIM ?

    RIM : l'administration américaine s'intéresse à BlackBerry 10 Après avoir fait un virage vers l'iPhone, l'année 2013 sera-t-elle celle du constructeur canadien ? L'année 2013 sera-t-elle celle du renouveau pour RIM ? Sans jouer les oracles, l'arrivée de BlackBerry 10 et de sa nouvelle plateforme de développement sont des signes encourageants pour le Canadien. Depuis hier, un autre signe va dans le même sens. Alors que l'administration américaine avait décidé de s'ouvrir à l'iPhone au détriment des seuls BlackBerry (souvenez-vous, la marque était, par exemple, la préférée de Barack Obama lors de sa première élection), voilà que la nouvelle version de l'OS et ses fonctionnali...

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  • A separate user for each task?

    - by Mark Tomlin
    I just got a VPS sver the other day, I'm new to server administration, but not that new to Ubuntu (11.04). I use it in my living room as the HTPC, and I had a previous VPS that I used on and off for a team speak server. This one I'm setting up for long term use. So I would like to know the best practice when it comes to websites and tasks that I have the server proforming. I understand that it could be beneficial to separate each website into it's own usergroup or under its own username. I would setup nginx so that it could read all of the users directors (and thus each website) but could not touch anything else. The same with the TeamSpeak, should I make a user for TeamSpeak so that it operates within its own confined area or is this overkill? I do have access to root on the sever and my current plan is to run about 4 websites and a TeamSpeak server. My stack is Linux (Ubuntu 11.04 LTS), nginx, and PHP 5.4.3 (using the PDO SQLite 3 built in driver for the database). Should PHP have it's own user group or is it ok to place it in with nginx?

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  • How to recover the plesk database?

    - by Kau-Boy
    When I try to launch the Plesk administration page of you server I get the following error: ERROR: PleskMainDBException MySQL query failed: MySQL server has gone away The MySQL Server is working well. Although it seems that the plesk database is somehow corrupt and any action on this database results in a restart of the mysql process, so even queries to other databases on the same MySQL server will be lost. If I try to connect to the plesk database using phpMyAdmin, I can only see the number of tables, the database had originally. But I am not able to open the tables listing. As soon as I try it, the mysql process crashes again. Trying to connect to the database using ssh works. I can even run a SELECT statement against any table an get a result. I don't know if it is an plesk error or an error of the psa database or even the MySQL server. Can you give me any tips on how to recover the plesk system. Should I try to repair the Plesk installation before. And if so, how can I do it and will all my settings get lost doing it? EDIT: Trying to dump the database, I get the following error: mysqldump: Got error: 2013: Lost connection to MySQL server during query when using LOCK TABLES

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  • Server Manager from Windows 2008 to Hyper-V 2008 R2?

    - by Roger Lipscombe
    My workstation is running Windows Server 2008. I do not have local admin privileges. I have a Hyper-V Server 2008 R2 (i.e. Core+Hyper-V) box. On that box, I do have local admin privileges. I can Remote Desktop to the box; Hyper-V Manager works fine (outside of Server Manager). It's just that there are some things that are easier to do in Server Manager (partition disks, etc.) than at the command line. I'd like to use Server Manager on my workstation to manage the Hyper-V box. However: When I run Server Manager on my workstation, it prompts for elevation, and won't then let me connect to another server. If I attempt to run MMC and then add "Server Manager" as a Snap-in, it doesn't prompt me for the server name. Then it complains that I'm not an Administrator. It doesn't provide for connecting to another server. The Remote Server Administration Tools (RSAT) are for Windows Vista and Windows 7 RC. These don't install on Windows 2008.

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  • Methods and practices for managing a network that has no internet connection

    - by FaultyJuggler
    Originally asked in Super User but realized this belongs here. Long story short, I am setting up a network with 32 servers of varying specs that will be used for testing and development. We will be using RedHat Linux, we also do not have a router as of yet and were looking into making one of the servers act as our router/DHCP etc. The small cluster will be on an isolated network with no internet. I can use external harddrives and discs to transfer anything from external sources into machines on the network, so this isn't a locked down secure network, it just won't have a direct connection to the outside world. I've worked on such setups before, but always long after they were setup. So I'm reaching out to see what everyone knows as far as how groups have handled initial setup and maintenance of such a situation. What is the best way to get them all configured and up to date? What are the best ways to automate updates, network wide installs, etc. With the only given that I have large multi-terabyte external hard drives that would be used to drop whatever files are needed onto a central server, how do i then distribute those files and install their contents? I've done perl scripting, some teammates have played with puppet, so we aren't completely in the dark, I just wanted to avoid reinventing the wheel since this is a common challenge.

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  • Windows user moving to Ubuntu 12.04. Where are the system tools, or equivalents?

    - by Big Endian
    I am a Windows user who has begun experimenting with Ubuntu. Ubuntu seems great, but for all the things it seems like I CAN'T do. How do I get to advanced administration stuff, like the list of drivers, all of the installed software, and something equivalent to Windows' Device Manager. I always heard that Linux was supposed to be very raw, and you had to have lots of computer experience to make it work. This seems just the opposite. Ubuntu seems very modern and user friendly, better in some regards than any operating system I have seen. Unfortunately, I can't find any of the guts of this system beneath all of the user friendly frosting... gunk... crap... stuff. I'm reminded more and more of an Apple computer (except Linux is more affordable :). So how do I peel back this layer and start using the computer? A solution other than installing Gnome 3 would be appreciated.

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  • Freezes (not crashes) with GCD, blocks and Core Data

    - by Lukasz
    I have recently rewritten my Core Data driven database controller to use Grand Central Dispatch to manage fetching and importing in the background. Controller can operate on 2 NSManagedContext's: NSManagedObjectContext *mainMoc instance variable for main thread. this contexts is used only by quick access for UI by main thread or by dipatch_get_main_queue() global queue. NSManagedObjectContext *bgMoc for background tasks (importing and fetching data for NSFetchedresultsController for tables). This background tasks are fired ONLY by user defined queue: dispatch_queue_t bgQueue (instance variable in database controller object). Fetching data for tables is done in background to not block user UI when bigger or more complicated predicates are performed. Example fetching code for NSFetchedResultsController in my table view controllers: -(void)fetchData{ dispatch_async([CDdb db].bgQueue, ^{ NSError *error = nil; [[self.fetchedResultsController fetchRequest] setPredicate:self.predicate]; if (self.fetchedResultsController && ![self.fetchedResultsController performFetch:&error]) { NSSLog(@"Unresolved error in fetchData %@", error); } if (!initial_fetch_attampted)initial_fetch_attampted = YES; fetching = NO; dispatch_async(dispatch_get_main_queue(), ^{ [self.table reloadData]; [self.table scrollRectToVisible:CGRectMake(0, 0, 100, 20) animated:YES]; }); }); } // end of fetchData function bgMoc merges with mainMoc on save using NSManagedObjectContextDidSaveNotification: - (void)bgMocDidSave:(NSNotification *)saveNotification { // CDdb - bgMoc didsave - merging changes with main mainMoc dispatch_async(dispatch_get_main_queue(), ^{ [self.mainMoc mergeChangesFromContextDidSaveNotification:saveNotification]; // Extra notification for some other, potentially interested clients [[NSNotificationCenter defaultCenter] postNotificationName:DATABASE_SAVED_WITH_CHANGES object:saveNotification]; }); } - (void)mainMocDidSave:(NSNotification *)saveNotification { // CDdb - main mainMoc didSave - merging changes with bgMoc dispatch_async(self.bgQueue, ^{ [self.bgMoc mergeChangesFromContextDidSaveNotification:saveNotification]; }); } NSfetchedResultsController delegate has only one method implemented (for simplicity): - (void)controllerDidChangeContent:(NSFetchedResultsController *)controller { dispatch_async(dispatch_get_main_queue(), ^{ [self fetchData]; }); } This way I am trying to follow Apple recommendation for Core Data: 1 NSManagedObjectContext per thread. I know this pattern is not completely clean for at last 2 reasons: bgQueue not necessarily fires the same thread after suspension but since it is serial, it should not matter much (there is never 2 threads trying access bgMoc NSManagedObjectContext dedicated to it). Sometimes table view data source methods will ask NSFetchedResultsController for info from bgMoc (since fetch is done on bgQueue) like sections count, fetched objects in section count, etc.... Event with this flaws this approach works pretty well of the 95% of application running time until ... AND HERE GOES MY QUESTION: Sometimes, very randomly application freezes but not crashes. It does not response on any touch and the only way to get it back to live is to restart it completely (switching back to and from background does not help). No exception is thrown and nothing is printed to the console (I have Breakpoints set for all exception in Xcode). I have tried to debug it using Instruments (time profiles especially) to see if there is something hard going on on main thread but nothing is showing up. I am aware that GCD and Core Data are the main suspects here, but I have no idea how to track / debug this. Let me point out, that this also happens when I dispatch all the tasks to the queues asynchronously only (using dispatch_async everywhere). This makes me think it is not just standard deadlock. Is there any possibility or hints of how could I get more info what is going on? Some extra debug flags, Instruments magical tricks or build setting etc... Any suggestions on what could be the cause are very much appreciated as well as (or) pointers to how to implement background fetching for NSFetchedResultsController and background importing in better way.

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  • How to recover a MySQL InnoDB table?

    - by Kau-Boy
    When I try to launch the Plesk administration page of you server I get the following error: ERROR: PleskMainDBException MySQL query failed: MySQL server has gone away The MySQL Server is working well. Although it seems that the plesk database is somehow corrupt and any action on this database results in a restart of the mysql process, so even queries to other databases on the same MySQL server will be lost. If I try to connect to the plesk database using phpMyAdmin, I can only see the number of tables, the database had originally. But I am not able to open the tables listing. As soon as I try it, the mysql process crashes again. Trying to connect to the database using ssh works. I can even run a SELECT statement against any table an get a result. I don't know if it is an plesk error or an error of the psa database or even the MySQL server. Can you give me any tips on how to recover the plesk system. Should I try to repair the Plesk installation before. And if so, how can I do it and will all my settings get lost doing it? EDIT: Trying to dump the database, I get the following error: mysqldump: Got error: 2013: Lost connection to MySQL server during query when using LOCK TABLES EDIT: I could find out, that the table 'data_bases' is responsible for the crash of the MySQL server process. But trying to repair it using a REPAIR TABLE statement doesn't work. EDIT: I now dropped the whole database and restored it from a dump. But why I try to recover the data_bases table I get the following error: ERROR 1005 (HY000) at line 24: Can't create table './psa/data_bases.frm' (errno: 121) I am not able to create the table again. Somewhere in the MySQL system there is still some information about this table. I tested the same thing locally. If I just delete the table files and then try to create the table again I get the same error. If I drop the table through MySQL, I can create the table again afterwards. But trying to drop the table using MySQL the whole MySQL system crashed. Is there any way to solve that issue?

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  • How do I (robustly) remotely execute tasks on Windows workstations in a domain?

    - by Zac B
    I'm not even sure if "robustly" is a word. Anyway. Context: We have a few hundred Windows 7 workstations on a LAN. We use AD/GPO management pretty heavily, but there are a lot of periodic and/or manual maintenance tasks we need to do that can't be done via GPO/scheduled task. For example, say I want to execute program X (which runs silently, in the background, and doesn't bother the user) on workstation Y, or say I want to execute task A on a workstation group B either on a schedule or on demand. Kicking the users off of their computers to do this (i.e. using RDP) is a no-no, and doesn't work on groups anyway. Question: What's the best way to do this that is robust enough that, after setup, I could give it to beginner support people (read: people who are phobic of the command line, and get confused with GUI interfaces more complicated than Firefox)? I'm a competent programmer, and, if there is a robust set of tools or framework out there for this type of task, I'd consider hacking something together myself if it didn't take too long. If there's some combination of tools or techniques that others use to make remote-workstation-administration doable by beginners, I have yet to find it. For those who care about the "why": I'm midlevel IT, and was told to implement a remote management solution that allows arbitrary/scheduled remote execution, with confirmation that programs actually ran remotely, and the ability to view what they returned. "Why?" I asked, "Can't I just use PsExec and the task scheduler on a dispatcher machine?" "No," I was told, "'Joe' the second-week tech is going to be in charge of this one, and he needs something simple with a GUI." What I've tried: I've played with making a bunch of one-clickable "transfer files to remote computer and run them with PsExec" batch/VB scrips, but those tend to break down and don't easily support running on customizable groups. I've played a little bit with the Windows version of Puppet, but it doesn't support arbitrary-time remote execution (it's ability to group computers into a tree/node structure is really nice though). I've used an older version of Altiris, and, while it does a lot of what I want, it's interface is awful, it's slow, crashes a lot, and is probably too expensive for management. SwiftWater's DMS solution does some of what I want, but it's very underdeveloped, closed-source (not a deal breaker but not ideal), and I get the impression that support and reliability are lacking.

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  • Just Finished My Presentation at SLO! (Central Coast Code Camp At Cal Poly)

    I love code camps!  This is my first time to San Luis Obispos Central Coast Code Camp and Im really enjoying it.  It started last night with the presenters dinner at a great local steak... This site is a resource for asp.net web programming. It has examples by Peter Kellner of techniques for high performance programming...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Objective C ASIHTTPRequest nested GCD block in complete block

    - by T.Leavy
    I was wondering if this is the correct way to have nested blocks working on the same variable in Objective C without causing any memory problems or crashes with ARC. It starts with a ASIHttpRequest complete block. MyObject *object = [dataSet objectAtIndex:i]; ASIHTTPRequest *request = [[ASIHTTPRequest alloc]initWithURL:@"FOO"]; __block MyObject *mutableObject = object; [request setCompleteBlock:^{ mutableObject.data = request.responseData; __block MyObject *gcdMutableObject = mutableObject; dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0),^{ [gcdMutableObject doLongComputation]; dispatch_async(dispatch_get_main_queue(),^{ [self updateGUIWithObject:gcdMutableObject]; }); }); [request startAsynchronous]; My main concern is nesting the dispatch queues and using the __block version of the previous queue to access data. Is what I am doing safe?

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  • Is this crash in libdispatch caused by Reachability?

    - by esilver
    Can anyone tell me if this crashing stack appears to be caused by Reachability? I am running apple's latest implementation of Reachability, downloadable at https://developer.apple.com/library/ios/samplecode/reachability/Introduction/Intro.html I have an app where ARC is not enabled by default (it is a legacy app) but I enable it on a per-file basis. I have enabled -fobjc-arc for Reachability.m When I look at these threads, my code is nowhere to be found. I see some activity happening because of a WebHTMLView (probably the ad network view code currently on screen; it's not mine). On Thread 10, I see a SCNetworkReachabilityDeallocate, then a dispatch_semaphore_wait_slow, and the crash happens on Thread 14 in libdispatch. Do you think this crash is being caused by that Reachability code, and have I erred in using -fobjc-arc with Reachability.m? Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Subtype: KERN_INVALID_ADDRESS at 0x2000000c Triggered by Thread: 14 Thread 0: 0 libsystem_kernel.dylib 0x39cafa84 mach_msg_trap + 20 1 libsystem_kernel.dylib 0x39caf87c mach_msg + 36 2 CoreFoundation 0x2f3e255c __CFRunLoopServiceMachPort + 152 3 CoreFoundation 0x2f3e0cc2 __CFRunLoopRun + 858 4 CoreFoundation 0x2f34b53c CFRunLoopRunSpecific + 520 5 CoreFoundation 0x2f34b31e CFRunLoopRunInMode + 102 6 GraphicsServices 0x340822e6 GSEventRunModal + 134 7 UIKit 0x31c021e0 UIApplicationMain + 1132 8 MyApp 0x00053ad4 main (main.m:33) 9 libdyld.dylib 0x39c0bab4 start + 0 Thread 1: 0 libsystem_kernel.dylib 0x39caf838 kevent64 + 24 1 libdispatch.dylib 0x39bfe0d0 _dispatch_mgr_invoke + 228 2 libdispatch.dylib 0x39bf863e _dispatch_mgr_thread + 34 Thread 2 name: com.apple.NSURLConnectionLoader Thread 2: 0 libsystem_kernel.dylib 0x39cb0910 close + 8 1 CoreFoundation 0x2f370ef6 CFSocketInvalidate + 434 2 CFNetwork 0x2f0122a2 Schedulables::_SchedulablesInvalidateApplierFunction(void const*, void*) + 14 3 CoreFoundation 0x2f34af6e CFArrayApplyFunction + 34 4 CFNetwork 0x2f011a94 SocketStream::close(void const*) + 280 5 CFNetwork 0x2f01194e CoreStreamBase::_streamInterface_Close() + 46 6 CFNetwork 0x2f030286 HTTPReadFilter::_streamImpl_Close() + 66 7 CFNetwork 0x2f01194e CoreStreamBase::_streamInterface_Close() + 46 8 CFNetwork 0x2f0301c6 NetConnection::shutdownConnectionStreams() + 98 9 CFNetwork 0x2f0309c8 NetConnection::closeStreamsIfPossibleOrSignalThatThatNeedsToBeDonePrettyPlease() + 56 10 CFNetwork 0x2f030d12 HTTPConnectionCacheEntry::removeUnauthConnection(NetConnection*) + 182 11 CoreFoundation 0x2f34af6e CFArrayApplyFunction + 34 12 CFNetwork 0x2f075678 HTTPConnectionCacheEntry::purgeIdleConnections(double, double) + 256 13 CFNetwork 0x2f030ad4 HTTPConnectionCache::performIdleSweep() + 156 14 CFNetwork 0x2f073b42 HTTPConnectionCache::timeoutIdleCellConnections() + 18 15 CFNetwork 0x2f0b3394 ___ZNK17CoreSchedulingSet13_performAsyncEPKcU13block_pointerFvvE_block_invoke + 16 16 CoreFoundation 0x2f34af6e CFArrayApplyFunction + 34 17 CFNetwork 0x2f019f10 RunloopBlockContext::perform() + 160 18 CFNetwork 0x2f019de2 MultiplexerSource::perform() + 218 19 CFNetwork 0x2f019c70 MultiplexerSource::_perform(void*) + 44 20 CoreFoundation 0x2f3e2f24 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 12 21 CoreFoundation 0x2f3e23ea __CFRunLoopDoSources0 + 202 22 CoreFoundation 0x2f3e0bda __CFRunLoopRun + 626 23 CoreFoundation 0x2f34b53c CFRunLoopRunSpecific + 520 24 CoreFoundation 0x2f34b31e CFRunLoopRunInMode + 102 25 Foundation 0x2fd8664c +[NSURLConnection(Loader) _resourceLoadLoop:] + 316 26 Foundation 0x2fdfbdc2 __NSThread__main__ + 1058 27 libsystem_pthread.dylib 0x39d28c5a _pthread_body + 138 28 libsystem_pthread.dylib 0x39d28bca _pthread_start + 98 29 libsystem_pthread.dylib 0x39d26ccc thread_start + 4 Thread 3 name: WebThread Thread 3: 0 CoreGraphics 0x2f49163c CGRectIsEmpty + 0 1 WebCore 0x37291700 -[WAKView setNeedsDisplayInRect:] + 76 2 WebKit 0x37cad22a -[WebHTMLView setNeedsDisplayInRect:] + 214 3 WebCore 0x372915cc WebCore::ScrollView::platformRepaintContentRectangle(WebCore::IntRect const&, bool) + 148 4 WebCore 0x37291412 WebCore::ScrollView::repaintContentRectangle(WebCore::IntRect const&, bool) + 98 5 WebCore 0x37291272 WebCore::FrameView::doDeferredRepaints() + 90 6 WebCore 0x372dc96c WebCore::FrameView::layout(bool) + 1748 7 WebCore 0x3721fb94 WebCore::ThreadTimers::sharedTimerFiredInternal() + 132 8 WebCore 0x3721fae6 WebCore::timerFired(__CFRunLoopTimer*, void*) + 22 9 CoreFoundation 0x2f3e2e84 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 12 10 CoreFoundation 0x2f3e2a9e __CFRunLoopDoTimer + 790 11 CoreFoundation 0x2f3e0e26 __CFRunLoopRun + 1214 12 CoreFoundation 0x2f34b53c CFRunLoopRunSpecific + 520 13 CoreFoundation 0x2f34b31e CFRunLoopRunInMode + 102 14 WebCore 0x372ae7d8 RunWebThread(void*) + 416 15 libsystem_pthread.dylib 0x39d28c5a _pthread_body + 138 16 libsystem_pthread.dylib 0x39d28bca _pthread_start + 98 17 libsystem_pthread.dylib 0x39d26ccc thread_start + 4 Thread 4: 0 libsystem_kernel.dylib 0x39cafa84 mach_msg_trap + 20 1 libsystem_kernel.dylib 0x39caf87c mach_msg + 36 2 CoreFoundation 0x2f3e255c __CFRunLoopServiceMachPort + 152 3 CoreFoundation 0x2f3e0c7c __CFRunLoopRun + 788 4 CoreFoundation 0x2f34b53c CFRunLoopRunSpecific + 520 5 CoreFoundation 0x2f34b31e CFRunLoopRunInMode + 102 6 libAVFAudio.dylib 0x2e3295ae GenericRunLoopThread::Entry(void*) + 126 7 libAVFAudio.dylib 0x2e31dbf4 CAPThread::Entry(CAPThread*) + 176 8 libsystem_pthread.dylib 0x39d28c5a _pthread_body + 138 9 libsystem_pthread.dylib 0x39d28bca _pthread_start + 98 10 libsystem_pthread.dylib 0x39d26ccc thread_start + 4 Thread 5 name: JavaScriptCore::BlockFree Thread 5: 0 libsystem_kernel.dylib 0x39cc1f38 __psynch_cvwait + 24 1 libsystem_pthread.dylib 0x39d28262 _pthread_cond_wait + 538 2 libsystem_pthread.dylib 0x39d2903c pthread_cond_wait + 36 3 JavaScriptCore 0x3036f408 JSC::BlockAllocator::blockFreeingThreadMain() + 204 4 JavaScriptCore 0x3036ca70 WTF::wtfThreadEntryPoint(void*) + 12 5 libsystem_pthread.dylib 0x39d28c5a _pthread_body + 138 6 libsystem_pthread.dylib 0x39d28bca _pthread_start + 98 7 libsystem_pthread.dylib 0x39d26ccc thread_start + 4 Thread 6 name: JavaScriptCore::Marking Thread 6: 0 libsystem_kernel.dylib 0x39cc1f38 __psynch_cvwait + 24 1 libsystem_pthread.dylib 0x39d28262 _pthread_cond_wait + 538 2 libsystem_pthread.dylib 0x39d2903c pthread_cond_wait + 36 3 JavaScriptCore 0x3050daf2 JSC::GCThread::waitForNextPhase() + 74 4 JavaScriptCore 0x3050db4c JSC::GCThread::gcThreadMain() + 48 5 JavaScriptCore 0x3036ca70 WTF::wtfThreadEntryPoint(void*) + 12 6 libsystem_pthread.dylib 0x39d28c5a _pthread_body + 138 7 libsystem_pthread.dylib 0x39d28bca _pthread_start + 98 8 libsystem_pthread.dylib 0x39d26ccc thread_start + 4 Thread 7 name: com.apple.CFSocket.private Thread 7: 0 libsystem_kernel.dylib 0x39cc2440 select$DARWIN_EXTSN + 20 1 CoreFoundation 0x2f3e645e __CFSocketManager + 482 2 libsystem_pthread.dylib 0x39d28c5a _pthread_body + 138 3 libsystem_pthread.dylib 0x39d28bca _pthread_start + 98 4 libsystem_pthread.dylib 0x39d26ccc thread_start + 4 Thread 8 name: AFNetworking Thread 8: 0 libsystem_kernel.dylib 0x39cafa84 mach_msg_trap + 20 1 libsystem_kernel.dylib 0x39caf87c mach_msg + 36 2 CoreFoundation 0x2f3e255c __CFRunLoopServiceMachPort + 152 3 CoreFoundation 0x2f3e0c7c __CFRunLoopRun + 788 4 CoreFoundation 0x2f34b53c CFRunLoopRunSpecific + 520 5 CoreFoundation 0x2f34b31e CFRunLoopRunInMode + 102 6 Foundation 0x2fd39822 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 250 7 Foundation 0x2fd8a664 -[NSRunLoop(NSRunLoop) run] + 76 8 MyApp 0x002c33d0 +[AFURLConnectionOperation networkRequestThreadEntryPoint:] (AFURLConnectionOperation.m:184) 9 Foundation 0x2fdfbdc2 __NSThread__main__ + 1058 10 libsystem_pthread.dylib 0x39d28c5a _pthread_body + 138 11 libsystem_pthread.dylib 0x39d28bca _pthread_start + 98 12 libsystem_pthread.dylib 0x39d26ccc thread_start + 4 Thread 9 name: WebCore: CFNetwork Loader Thread 9: 0 libsystem_kernel.dylib 0x39cafa84 mach_msg_trap + 20 1 libsystem_kernel.dylib 0x39caf87c mach_msg + 36 2 CoreFoundation 0x2f3e255c __CFRunLoopServiceMachPort + 152 3 CoreFoundation 0x2f3e0c7c __CFRunLoopRun + 788 4 CoreFoundation 0x2f34b53c CFRunLoopRunSpecific + 520 5 CoreFoundation 0x2f34b31e CFRunLoopRunInMode + 102 6 WebCore 0x372f7872 WebCore::runLoaderThread(void*) + 250 7 JavaScriptCore 0x3036ca70 WTF::wtfThreadEntryPoint(void*) + 12 8 libsystem_pthread.dylib 0x39d28c5a _pthread_body + 138 9 libsystem_pthread.dylib 0x39d28bca _pthread_start + 98 10 libsystem_pthread.dylib 0x39d26ccc thread_start + 4 Thread 10: 0 libsystem_kernel.dylib 0x39cafad4 semaphore_wait_trap + 8 1 libdispatch.dylib 0x39bfcdec _dispatch_semaphore_wait_slow + 172 2 libxpc.dylib 0x39d370d6 xpc_connection_send_message_with_reply_sync + 150 3 SystemConfiguration 0x31b77362 _reach_server_target_remove + 90 4 SystemConfiguration 0x31b772d2 __SCNetworkReachabilityServer_targetRemove + 38 5 SystemConfiguration 0x31b5e318 __SCNetworkReachabilityDeallocate + 92 6 CoreFoundation 0x2f347efc CFRelease + 464 7 libdispatch.dylib 0x39bfc7e0 _dispatch_root_queue_drain + 220 8 libdispatch.dylib 0x39bfc9cc _dispatch_worker_thread2 + 52 9 libsystem_pthread.dylib 0x39d26dfc _pthread_wqthread + 296 10 libsystem_pthread.dylib 0x39d26cc0 start_wqthread + 4 Thread 11: 0 libsystem_kernel.dylib 0x39cc2c7c __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x39d26e06 _pthread_wqthread + 306 2 libsystem_pthread.dylib 0x39d26cc0 start_wqthread + 4 Thread 12: 0 libsystem_kernel.dylib 0x39cc2c7c __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x39d26e06 _pthread_wqthread + 306 2 libsystem_pthread.dylib 0x39d26cc0 start_wqthread + 4 Thread 13: 0 libsystem_kernel.dylib 0x39cafa84 mach_msg_trap + 20 1 libsystem_kernel.dylib 0x39caf87c mach_msg + 36 2 CoreFoundation 0x2f3e255c __CFRunLoopServiceMachPort + 152 3 CoreFoundation 0x2f3e0c7c __CFRunLoopRun + 788 4 CoreFoundation 0x2f34b53c CFRunLoopRunSpecific + 520 5 CoreFoundation 0x2f38f1a6 CFRunLoopRun + 94 6 CoreMotion 0x2fa03394 ___lldb_unnamed_function1407$$CoreMotion + 724 7 libsystem_pthread.dylib 0x39d28c5a _pthread_body + 138 8 libsystem_pthread.dylib 0x39d28bca _pthread_start + 98 9 libsystem_pthread.dylib 0x39d26ccc thread_start + 4 Thread 14 Crashed: 0 libobjc.A.dylib 0x3970db66 objc_msgSend + 6 1 CoreFoundation 0x2f347f58 CFRelease + 556 2 libdispatch.dylib 0x39bf7100 _dispatch_call_block_and_release + 8 3 libdispatch.dylib 0x39bfbe72 _dispatch_queue_drain + 370 4 libdispatch.dylib 0x39bf8f96 _dispatch_queue_invoke + 38 5 libdispatch.dylib 0x39bfc74e _dispatch_root_queue_drain + 74 6 libdispatch.dylib 0x39bfc9cc _dispatch_worker_thread2 + 52 7 libsystem_pthread.dylib 0x39d26dfc _pthread_wqthread + 296 8 libsystem_pthread.dylib 0x39d26cc0 start_wqthread + 4

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  • Is This a Valid Way to Use Blocks in Objective-C?

    - by Carter
    I've been building a HTTP client that uses web services to synchronize information between the client and server. I've been using Blocks and NSURLConnection to achieve this on the client side, but I'm getting frequent EXC_BAD_ACCESS crashes in objc_msgSend(). From what I understand, this usually means that a stored block that has fallen off the stack has been called. I think I've coded things correctly to avoid this, but I'm still stuck. Here is conceptually what my code is doing. It starts by calling "synchronizeWithWebServer". That method invokes "listRootObjectsOnServerWithBlock:" which takes in a block to be called when the method returns. "listRootObjectsOnServersWithBlock:" initiates a NSURLConnection to the web server asynchronously. It to expects a block to be called when it returns. Inside that block I want to be able to execute the original Block (so aptly named 'block'). This is only a simplified version of my code. The real synchronization process is more complex but it's mostly more of the same as what you see below. Sometimes the code works perfectly, but about 80% of the time it crashes very early on in the routine. It seems to be more vulnerable to crashing when my data set gets larger. - (void)synchronizeWithWebServer { [self listRootObjectsOnServerWithBlock:^(NSArray *results, NSError *error) { //Iterate over result objects and perform some other similar routines. }]; } - (void)listRootObjectsOnServerWithBlock:(void (^)(NSArray *results, NSError *error))block { //Create NSURLRequest Here //Create connection asynchronously. block = [block copy]; [NSURLConnection sendAsynchronousRequest:urlRequest queue:[NSOperationQueue currentQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){ //Parse response from web server (stored in NSData *data) NSArray *results = ..... //Call 'block' block(results, error); [block release]; }]; }

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  • GCD and AppleEvents / NSOperationQueue and AppleScript

    - by mahal tertin
    As i understood, the threads provided by GCD do have a runloop but no source/port. Now i use some of methods that call AppleScripts thru AppleEvents inside an NSOperationQueue. And sometimes my app crashes with following stacktrace. my questions: Usage of AppleScript inside a NSInvocationOperation or NSBlockOperation Usage of AppleEvents inside GCD-Threads do i have to add a source / port to a runloop of a gcd-thread before using AppleEvents? do i have to add a source / port to a runloop of a gcd-thread before using [CATransaction commit]? do i have to add a source / port to a runloop of a gcd-thread before using [NSObject performSelectorAfterDelay...] ? if yes, how? can i simply call CFRunLoopRunInMode(kCFRunLoopDefaultMode, 5.0, false); /// or 30 or the defined timeout of appleevent? .. Thread 9: Dispatch queue: com.apple.root.default-priority 0 libSystem.B.dylib 0x00007fff88276e82 semaphore_wait_signal_trap 10 1 libSystem.B.dylib 0x00007fff8827c3cd pthread_mutex_lock 469 2 com.apple.applescript 0x000000011d3d461f AppleScriptComponent 50 3 com.apple.applescript 0x000000011d3edbcc AGenericCall::Delegate(ComponentInstanceRecord*) 46 4 com.apple.applescript 0x000000011d3ed520 AGenericManager::HandleOSACall(ComponentParameters*) 54 5 com.apple.applescript 0x000000011d3ed4b0 GenericComponent 219 6 com.apple.openscripting 0x00007fff8381c6da OSAExecuteEvent 63 7 com.apple.Foundation 0x00007fff86f320d8 -[NSAppleScript(NSPrivate) _executeAppleEvent:withMode:error:] 161 8 xxx 0x0000000100048af0 -[TCallScript callScript:withArrayOfParameters:] 480 9 xxx 0x0000000100048ffd -[TCallScript callHandler:withParameters:] 477 10 xxx 0x0000000100036032 -[ZFOpenWindowController getSafariItemForCurrentTabForWindow:] 66 11 xxx 0x00000001000346af -[ZFOpenWindowController refreshWindowList:] 1679 12 xxx 0x000000010003541c -[ZFOpenWindowController bringZFToForegroundZoomOut:orJustLinkFrontMost:toItem:] 2988 13 xxx 0x0000000100053556 __-[ZFSelectionTool openWithPreferredApplication:]_block_invoke_516 54 14 com.apple.Foundation 0x00007fff86ed87d9 -[NSBlockOperation main] 140 15 com.apple.Foundation 0x00007fff86ec906d -[__NSOperationInternal start] 681 16 com.apple.Foundation 0x00007fff86ec8d23 ____startOperations_block_invoke_2 99 17 libSystem.B.dylib 0x00007fff882b2ce8 _dispatch_call_block_and_release 15 18 libSystem.B.dylib 0x00007fff88291279 _dispatch_worker_thread2 231 19 libSystem.B.dylib 0x00007fff88290bb8 _pthread_wqthread 353 20 libSystem.B.dylib 0x00007fff88290a55 start_wqthread 13 ... Thread 11 Crashed: Dispatch queue: com.apple.root.default-priority 0 com.apple.applescript 0x000000011d40f658 BCHandleError() 182 1 com.apple.applescript 0x000000011d4059ca UASExecute1() 2546 2 com.apple.applescript 0x000000011d3dd1d5 ASExecuteEvent(AEDesc const*, unsigned int, int, unsigned int*) 695 3 ...ple.CoreServices.CarbonCore 0x00007fff85388e04 CallComponentFunction 28 4 com.apple.applescript 0x000000011d3d4cad AppleScriptComponent 1728 5 com.apple.applescript 0x000000011d3edbcc AGenericCall::Delegate(ComponentInstanceRecord*) 46 6 com.apple.applescript 0x000000011d3ed520 AGenericManager::HandleOSACall(ComponentParameters*) 54 7 com.apple.applescript 0x000000011d3ed4b0 GenericComponent 219 8 com.apple.openscripting 0x00007fff8381c6da OSAExecuteEvent 63 9 com.apple.Foundation 0x00007fff86f320d8 -[NSAppleScript(NSPrivate) _executeAppleEvent:withMode:error:] 161 10 xxx 0x0000000100048af0 -[TCallScript callScript:withArrayOfParameters:] 480 11 xxx 0x0000000100048ffd -[TCallScript callHandler:withParameters:] 477 12 xxx 0x0000000100035c67 -[ZFOpenWindowController getItemForAXDocumentOfFrontMostWindow] 119 13 xxx 0x00000001000359f1 -[ZFOpenWindowController getItemForFrontMostWindow:] 721 14 xxx 0x00000001000348ac -[ZFOpenWindowController bringZFToForegroundZoomOut:orJustLinkFrontMost:toItem:] 60 15 xxx 0x0000000100053556 __-[ZFSelectionTool openWithPreferredApplication:]_block_invoke_516 54 16 com.apple.Foundation 0x00007fff86ed87d9 -[NSBlockOperation main] 140 17 com.apple.Foundation 0x00007fff86ec906d -[__NSOperationInternal start] 681 18 com.apple.Foundation 0x00007fff86ec8d23 ____startOperations_block_invoke_2 99 19 libSystem.B.dylib 0x00007fff882b2ce8 _dispatch_call_block_and_release 15 20 libSystem.B.dylib 0x00007fff88291279 _dispatch_worker_thread2 231 21 libSystem.B.dylib 0x00007fff88290bb8 _pthread_wqthread 353 22 libSystem.B.dylib 0x00007fff88290a55 start_wqthread 13

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  • How do I specify the block object / predicate required by NSDictionary's keysOfEntriesPassingTest ?

    - by Todd
    For learning (not practical -- yet) purposes, I'd like to use the following method on an NSDictionary to give me back a set of keys that have values using a test I've defined. Unfortunately have no idea how to specify the predicate. NSDictionary keysOfEntriesPassingTest: - (NSSet *)keysOfEntriesPassingTest:(BOOL (^)(id key, id obj, BOOL *stop))predicate Let's say for example all my values are NSURLs, and I'd like to get back all the URLs that are on port 8080. Here's my stab at coding that -- though it doesn't really make sense to me that it'd be correct: NSSet * mySet = [myDict keysOfEntriesPassingTest:^(id key, id obj, BOOL *stop) { if( [[obj port] isEqual: [NSNumber numberWithInt: 8080]]) { return key; }] And that's because I get back the following compiler error: incompatible block pointer types initializing 'void (^)(struct objc_object *, struct objc_object *, BOOL *)', expected 'BOOL (^)(struct objc_object *, struct objc_object *, BOOL *)' What am I missing? I'd appreciate a pointer at some docs that go into more detail about the "Block object" that the predicate is supposed to be. Thanks!

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  • Singleton Issues in iOS http client

    - by Andrew Lauer Barinov
    I implemented an HTTP client is iOS that is meant to be a singleton. It is a subclass of AFNetworking's excellent AFHTTPClient My access method is pretty standard: + (LBHTTPClient*) sharedHTTPClient { static dispatch_once_t once = 0; static LBHTTPClient *sharedHTTPClient = nil; dispatch_once(&once, ^{ sharedHTTPClient = [[LBHTTPClient alloc] initHTTPClient]; }); return sharedHTTPClient; } // my init method - (id) initHTTPClient { self = [super initWithBaseURL:[NSURL URLWithString:kBaseURL]]; if (self) { // Sub class specific initializations } return self; } Super's init method is very long, and can be found here However the problem I experience is when the dispatch_once queue is run, the app locks and become unresponsive. When I step through code, I notice that it locks on dispatch_once and then remains frozen. Is this something to do with the main thread locking down? How come it stays locked like that? Also, none of the HTTP client methods fire. Stepping through the code some more, I find this line in dispatch/once.h is where the app locks down: DISPATCH_INLINE DISPATCH_ALWAYS_INLINE DISPATCH_NONNULL_ALL DISPATCH_NOTHROW void _dispatch_once(dispatch_once_t *predicate, dispatch_block_t block) { if (DISPATCH_EXPECT(*predicate, ~0l) != ~0l) { dispatch_once(predicate, block); // App locks here } }

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  • iPhone: Using dispatch_after to mimick NSTimer

    - by Joseph Tura
    Don't know a whole lot about blocks. How would you go about mimicking a repeating NSTimer with dispatch_after? My problem is that I want to "pause" a timer when the app moves to the background, but subclassing NSTimer does not seem to work. I tried something which seems to work. I cannot judge its performance implications or whether it could be greatly optimized. Any input is welcome. #import "TimerWithPause.h" @implementation TimerWithPause @synthesize timeInterval; @synthesize userInfo; @synthesize invalid; @synthesize invocation; + (TimerWithPause *)scheduledTimerWithTimeInterval:(NSTimeInterval)aTimeInterval target:(id)aTarget selector:(SEL)aSelector userInfo:(id)aUserInfo repeats:(BOOL)aTimerRepeats { TimerWithPause *timer = [[[TimerWithPause alloc] init] autorelease]; timer.timeInterval = aTimeInterval; NSMethodSignature *signature = [[aTarget class] instanceMethodSignatureForSelector:aSelector]; NSInvocation *aInvocation = [NSInvocation invocationWithMethodSignature:signature]; [aInvocation setSelector:aSelector]; [aInvocation setTarget:aTarget]; [aInvocation setArgument:&timer atIndex:2]; timer.invocation = aInvocation; timer.userInfo = aUserInfo; if (!aTimerRepeats) { timer.invalid = YES; } [timer fireAfterDelay]; return timer; } - (void)fireAfterDelay { dispatch_time_t delay = dispatch_time(DISPATCH_TIME_NOW, self.timeInterval * NSEC_PER_SEC); dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_after(delay, queue, ^{ [invocation performSelectorOnMainThread:@selector(invoke) withObject:nil waitUntilDone:NO]; if (!invalid) { [self fireAfterDelay]; } }); } - (void)invalidate { invalid = YES; [invocation release]; invocation = nil; [userInfo release]; userInfo = nil; } - (void)dealloc { [self invalidate]; [super dealloc]; } @end

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  • converting NSTimer running not on main runloop to GCD

    - by Justin Galzic
    I have a task that runs periodically and it was originally designed to run on a separate run loop than the main runloop using NSThread and NSTimer. What's the best way to adapt this to take advantage of GCD? Current code: -(void)initiateSomeTask { [NSThread detachNewThreadSelector:@selector(startTimerTask) toTarget:self withObject:nil]; } -(void)startTimerTask { // We won't get back the main runloop since we're on a new thread NSRunLoop *myRunLoop = [NSRunLoop currentRunLoop]; NSPort *myPort = [NSMachPort port]; [myRunLoop addPort:myPort forMode:NSDefaultRunLoopMode]; NSTimer *myTimer = [NSTimer timerWithTimeInterval:10 /* seconds */ target:self selector:@selector(doMyTaskMethod) userInfo:nil repeats:YES]; [myRunLoop addTimer:myTimer forMode:NSRunLoopCommonModes]; [myRunLoop run]; } Is there anything I can do besides replace detachNewThreadSelector with dispatch_async?

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  • Updating UISearchDisplayController with Core Data results using GCD

    - by Brian Halpin
    I'm having trouble displaying the results from Core Data in my UISearchDisplayController when I implement GCD. Without it, it works, but obviously blocks the UI. In my SearchTableViewController I have the following two methods: - (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString { // Tell the table data source to reload when text changes [self filterContentForSearchText:searchString]; // Return YES to cause the search result table view to be reloaded. return YES; } // Update the filtered array based on the search text -(void)filterContentForSearchText:(NSString*)searchText { // Remove all objects from the filtered search array [self.filteredLocationsArray removeAllObjects]; NSPredicate *predicate = [CoreDataMaster predicateForLocationUsingSearchText:@"Limerick"]; CoreDataMaster *coreDataMaster = [[CoreDataMaster alloc] init]; // Filter the array using NSPredicate self.filteredLocationsArray = [NSMutableArray arrayWithArray: [coreDataMaster fetchResultsFromCoreDataEntity:@"City" UsingPredicate:predicate]]; } You can probably guess that my problem is with returning the array from [coreDataMaster fetchResultsFromCoreDataEntity]. Below is the method: - (NSArray *)fetchResultsFromCoreDataEntity:(NSString *)entity UsingPredicate:(NSPredicate *)predicate { NSMutableArray *fetchedResults = [[NSMutableArray alloc] init]; dispatch_queue_t coreDataQueue = dispatch_queue_create("com.coredata.queue", DISPATCH_QUEUE_SERIAL); dispatch_async(coreDataQueue, ^{ NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entityDescription = [NSEntityDescription entityForName:entity inManagedObjectContext:self.managedObjectContext]; NSSortDescriptor *nameSort = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES]; NSArray *sortDescriptors = [NSArray arrayWithObjects:nameSort, nil]; [fetchRequest setEntity:entityDescription]; [fetchRequest setSortDescriptors:sortDescriptors]; // Check if predicate is set if (predicate) { [fetchRequest setPredicate:predicate]; } NSError *error = nil; NSArray *fetchedManagedObjects = [self.managedObjectContext executeFetchRequest:fetchRequest error:&error]; for (City *city in fetchedManagedObjects) { [fetchedResults addObject:city]; } NSDictionary *userInfo = [NSDictionary dictionaryWithObject:[NSArray arrayWithArray:fetchedResults] forKey:@"results"]; [[NSNotificationCenter defaultCenter] postNotificationName:@"fetchResultsComplete" object:nil userInfo:userInfo]; }); return [NSArray arrayWithArray:fetchedResults]; } So the thread hasn't finished executing by the time it returns the results to self.filteredLocationsArray. I've tried added a NSNotification which passes the NSDictionary to this method: - (void)updateSearchResults:(NSNotification *)notification { NSDictionary *userInfo = notification.userInfo; NSArray *array = [userInfo objectForKey:@"results"]; self.filteredLocationsArray = [NSMutableArray arrayWithArray:array]; [self.tableView reloadData]; } I've also tried refreshing the searchViewController like [self.searchDisplayController.searchResultsTableView reloadData]; but to no avail. I'd really appreciate it if someone could point me in the right direction and show me where I might be going wrong. Thanks

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