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2014/10/15 ¤U¤È 10:09:55
iphone Programming Glossary: grandCommon multithreading mistakes beginners make on iPhone http://stackoverflow.com/questions/1357108/common-multithreading-mistakes-beginners-make-on-iphone I also highly recommend reading the new Concurrency Programming Guide however ignore the blocks and dispatch queues as Grand Central Dispatch is not yet available on iPhone OS iOS 4.0 just added blocks and GCD because it makes a strong case for..
NSThread vs. NSOperationQueue vs. ??? on the iPhone http://stackoverflow.com/questions/3041837/nsthread-vs-nsoperationqueue-vs-on-the-iphone most the work is already done for you. NSOperationQueue is free to switch to a smarter implementation like Grand Central Dispatch now or in the future. NSThread is more likely to always be just an operating system thread. Bonus NSOperationQueue..
iphone ios running in separate thread http://stackoverflow.com/questions/3869217/iphone-ios-running-in-separate-thread multithreading ios thread safety share improve this question In my opinion the best way is with libdispatch aka Grand Central Dispatch GCD . It limits you to iOS 4 and greater but it's just so simple and easy to use. The code to do some processing..
Do you need to create an NSAutoreleasePool within a block in GCD? http://stackoverflow.com/questions/4141123/do-you-need-to-create-an-nsautoreleasepool-within-a-block-in-gcd that thread or operation because none exists by default. Does the same rule apply to a block that is placed within a Grand Central Dispatch queue and will be run on a non main thread That is do you need to create an NSAutoreleasePool within each.. osx grand central dispatch share improve this question Does the same rule apply to a block that is placed within a Grand Central Dispatch queue and will be run on a non main thread That is do you need to create an NSAutoreleasePool within each.. is do you need to create an NSAutoreleasePool within each block you dispatch to anything other than the main queue Grand central dispatch will manage an autorelease pool per queue automatically. However there are no guarantees as to when the..
Grand Central Dispatch (GCD) with CoreData http://stackoverflow.com/questions/4264540/grand-central-dispatch-gcd-with-coredata Central Dispatch GCD with CoreData I'm using Grand Central Dispatch GCD in my application to do some heavy lifting. The.. Central Dispatch GCD with CoreData I'm using Grand Central Dispatch GCD in my application to do some heavy lifting. The application is using Core Data for data storage purposes...
NSURLConnection and grand central dispatch http://stackoverflow.com/questions/5037545/nsurlconnection-and-grand-central-dispatch for network programming and recommended to use asynchronous network programming with RunLoop. Use background thread Grand Central Dispatch Concurrent Queue for thread safe data processing not for network programming. By the way Blocks and Grand.. Central Dispatch Concurrent Queue for thread safe data processing not for network programming. By the way Blocks and Grand Central Dispatch sessions are also worth to see. WWDC 2010 Session 206 Introducing Blocks and Grand Central Dispatch on.. the way Blocks and Grand Central Dispatch sessions are also worth to see. WWDC 2010 Session 206 Introducing Blocks and Grand Central Dispatch on iPhone WWDC 2010 Session 211 Simplifying iPhone App Development with Grand Central Dispatch I wrote..
How to make ui responsive all the time and do background updating? http://stackoverflow.com/questions/5133731/how-to-make-ui-responsive-all-the-time-and-do-background-updating of the grid of thumbnails. TIA Praveen S iphone objective c cocoa asynchronous share improve this question Grand Central Dispatch is easy to use for background loading. But GCD is only for after iOS4. If you have to support iOS3 performSelectorInBackground..
Grand Central Dispatch (GCD) vs. performSelector - need a better explanation http://stackoverflow.com/questions/5225130/grand-central-dispatch-gcd-vs-performselector-need-a-better-explanation Central Dispatch GCD vs. performSelector need a better explanation I've used both GCD and performSelectorOnMainThread waitUntilDone..
CADisplayLink OpenGL rendering breaks UIScrollView behaviour http://stackoverflow.com/questions/5944050/cadisplaylink-opengl-rendering-breaks-uiscrollview-behaviour CADisplayLink. One way around this is to perform your OpenGL ES rendering actions on a background thread by using a Grand Central Dispatch serial queue. I did this in my recent update to Molecules source code for which can be found at that link..
Core Data and threads / Grand Central Dispatch http://stackoverflow.com/questions/7540801/core-data-and-threads-grand-central-dispatch Data and threads Grand Central Dispatch I'm a beginner with Grand Central Dispatch GCD and Core Data and I need your help to use Core Data with.. Data and threads Grand Central Dispatch I'm a beginner with Grand Central Dispatch GCD and Core Data and I need your help to use Core Data with CGD so that the UI is not locked while I add..
Last In-First Out Stack with GCD? http://stackoverflow.com/questions/7567827/last-in-first-out-stack-with-gcd next to be updated and then the others that are currently off screen would be updated. Is such a thing possible with Grand Central Dispatch Or not too onerous to implement some other way Note by the way that I am using Core Data with a SQLite.. setImage contact.image theCell setNeedsLayout return cell The WWDC2010 conference video Introducing Blocks and Grand Central Dispatch shows an example using the nested dispatch_async as well. another potential optimization could be to start..
Why does Apple recommend to use dispatch_once for implementing the singleton pattern under ARC? http://stackoverflow.com/questions/9119042/why-does-apple-recommend-to-use-dispatch-once-for-implementing-the-singleton-pat until Christmas to create my object It doesn't return immediately right At least that seems to be the whole point of Grand Central Dispatch. So why are they doing this iphone objective c ios singleton automatic ref counting share improve this..
Objective-C, cancel a dispatch queue using UI event http://stackoverflow.com/questions/10066897/objective-c-cancel-a-dispatch-queue-using-ui-event out the NSLog line the _cancelModification is neglected when it changes to YES iphone objective c ios concurrency grand central dispatch share improve this question If you declare your BOOL using __block then it can be changed outside of..
NSThread vs. NSOperationQueue vs. ??? on the iPhone http://stackoverflow.com/questions/3041837/nsthread-vs-nsoperationqueue-vs-on-the-iphone code and my tests clean organized and happily asynchronous. A Would subclass again iphone nsthread nsoperationqueue grand central dispatch share improve this question In general you'll get better mileage with NSOperationQueue . Three specific..
Best practice to send a lot of data in background on iOS4 device? http://stackoverflow.com/questions/3928861/best-practice-to-send-a-lot-of-data-in-background-on-ios4-device data using existing asynchronous methods Any ideas best practices how to implement this iphone ios multithreading grand central dispatch nsoperation share improve this question OK I'll answer my own question. First like tc said it's better..
How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:? http://stackoverflow.com/questions/4139219/how-do-you-trigger-a-block-after-a-delay-like-performselectorwithobjectafter withObject afterDelay but with an argument like int double float iphone objective c objective c blocks grand central dispatch share improve this question I think you're looking for dispatch_after . It requires your block to accept..
Do you need to create an NSAutoreleasePool within a block in GCD? http://stackoverflow.com/questions/4141123/do-you-need-to-create-an-nsautoreleasepool-within-a-block-in-gcd on this so I was wondering if someone could point out where this is stated. iphone objective c cocoa osx grand central dispatch share improve this question Does the same rule apply to a block that is placed within a Grand Central..
Grand Central Dispatch (GCD) with CoreData http://stackoverflow.com/questions/4264540/grand-central-dispatch-gcd-with-coredata operations that update the NSManagedObject might take 2 3 seconds. Please advise. iphone core data objective c blocks grand central dispatch share improve this question As you probably know or have noticed you must perform UI operations on..
Applying Effect to iPhone Camera Preview “Video” http://stackoverflow.com/questions/4893620/applying-effect-to-iphone-camera-preview-video take action to prevent the low memory conditions in this case and or a better way to flush the dispatch queue iphone grand central dispatch avcapturesession share improve this question To prevent the memory issues simply create an autorelease..
Concurrency and serial queues in Grand Central Dispatch http://stackoverflow.com/questions/5026043/concurrency-and-serial-queues-in-grand-central-dispatch is serial How can a serial queue do things in parallel or if you will out of order thanks iphone objective c ios grand central dispatch share improve this question dispatch_async means that the block is enqueued and dispatch_async returns..
NSURLConnection and grand central dispatch http://stackoverflow.com/questions/5037545/nsurlconnection-and-grand-central-dispatch and grand central dispatch Is it advisable to wrap up NSUrlConnection in a gcd style blocks and run it on a low_priority queue I.. result self mySynchronousHttp someURLToInvoke If I need to cancel dispatch_suspend queue iphone nsurlconnection grand central dispatch share improve this question I recommend you to see WWDC Sessions about network application in iPhone..
Grand Central Dispatch (GCD) vs. performSelector - need a better explanation http://stackoverflow.com/questions/5225130/grand-central-dispatch-gcd-vs-performselector-need-a-better-explanation read a lot of documentation on them but have yet to see a definitive answer. iphone objective c multithreading ios grand central dispatch share improve this question performSelectorOnMainThread does not use GCD to send messages to objects..
Can you use cancel/isCancelled with GCD/dispatch_async? http://stackoverflow.com/questions/5449469/can-you-use-cancel-iscancelled-with-gcd-dispatch-async have open when you break out of the BG process. Hope it helps someone sometime iphone multithreading ios nsoperation grand central dispatch share improve this question GCD does not have built in support for cancellation if it's important to..
What are the tradeoffs between performSelector:withObject:afterDelay: and dispatch_after http://stackoverflow.com/questions/6205998/what-are-the-tradeoffs-between-performselectorwithobjectafterdelay-and-dispat I prefer one interface for certain tasks to better follow common styles or conventions iphone objective c ios ios4 grand central dispatch share improve this question dispatch_after is part of the new Grand Central Dispatch which is an extension..
Unhiding a view is very slow in CTCallCenter callEventHandler http://stackoverflow.com/questions/6274642/unhiding-a-view-is-very-slow-in-ctcallcenter-calleventhandler cause only part of it's block to execute immediately and the rest to wait ~ 7 seconds Thanks iphone objective c ios grand central dispatch core telephony share improve this question Try changing your code to this void ctCallStateDidChange..
What exactly is GCD and where should it be used? http://stackoverflow.com/questions/6539656/what-exactly-is-gcd-and-where-should-it-be-used the obvious web requests. Could you explain what GCD is and where it should shouldn't be used iphone asynchronous grand central dispatch share improve this question I strongly suggest you to read the chapter called Dispatch Queues in Apple's..
Core Data and threads / Grand Central Dispatch http://stackoverflow.com/questions/7540801/core-data-and-threads-grand-central-dispatch data and update the UI without blocking the UI while saving the 40.000 objects iphone ios multithreading core data grand central dispatch share improve this question Here's a good example for you to try. Feel free to come back if you have..
Last In-First Out Stack with GCD? http://stackoverflow.com/questions/7567827/last-in-first-out-stack-with-gcd to the original question as well as the best solution I ended up implementing... iphone objective c ios uitableview grand central dispatch share improve this question Because of the memory constraints of the device you should load the images..
Correct Singleton Pattern Objective C (iOS)? http://stackoverflow.com/questions/7598820/correct-singleton-pattern-objective-c-ios tell me if I've missing something or doing something completely wrong Cheers Stefan iphone objective c ios singleton grand central dispatch share improve this question Keep it simple id sharedInstance static dispatch_once_t pred static MyClass..
Why does this code cause “EXC_BAD_INSTRUCTION”? http://stackoverflow.com/questions/8287621/why-does-this-code-cause-exc-bad-instruction When the program runs to dispatch_release aSemaphore it will cause EXC_BAD_INSTRUCTION and then crash. Why iphone ios grand central dispatch share improve this question I tried this code and it does indeed die with illegal instruction. So I..
What's the difference between the “global queue” and the “main queue” in GCD? http://stackoverflow.com/questions/9602042/whats-the-difference-between-the-global-queue-and-the-main-queue-in-gcd which execute UI work. Does this mean a global queue is one that runs on a background thread iphone ios concurrency grand central dispatch share improve this question The main queue does indeed run on the main thread like you say. The global..
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