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2014/10/15 ¤U¤È 10:05:25
iphone Programming Glossary: concurrencyhttp://stackoverflow.com/questions/1237649/json-or-soap-xml from server to iphone stored locally and then uploaded back to apply changes and make them available to other people . Concurrency should not be a problem at least at this time... In any case I have to develop both the server side webservice or whatever..
UITableView with images scrolls very slowly [duplicate] http://stackoverflow.com/questions/12703297/uitableview-with-images-scrolls-very-slowly uitableview scrolling share improve this question You can use NSOperationQueue or GCD to do your lazy loading see Concurrency Programming Guide for discussion of different asynchronous operations technologies . The former enjoys an advantage that..
How to achieve concurrent task through NSOperation? [closed] http://stackoverflow.com/questions/12910479/how-to-achieve-concurrent-task-through-nsoperation in cases where you need to execute the operation asynchronously without adding it to an operation queue. See the Concurrency Programming Guide section Concurrent Versus Non concurrent Operations Also Please read Managing Concurrency with NSOperation.. See the Concurrency Programming Guide section Concurrent Versus Non concurrent Operations Also Please read Managing Concurrency with NSOperation You typically execute operations by adding them to an operation queue an instance of the NSOperationQueue..
Common multithreading mistakes beginners make on iPhone http://stackoverflow.com/questions/1357108/common-multithreading-mistakes-beginners-make-on-iphone Where can I find a good tutorial on iPhone Objective c multithreading 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..
Multithreaded use of Core Data (NSOperationQueue and NSManagedObjectContext) http://stackoverflow.com/questions/1454473/multithreaded-use-of-core-data-nsoperationqueue-and-nsmanagedobjectcontext use of Core Data NSOperationQueue and NSManagedObjectContext In Apple's Core Data documentation for Concurrency with Core Data they list the preferred method for thread safety as using a seperate NSManagedObjectContext per thread with..
Core Data multi thread application http://stackoverflow.com/questions/2138252/core-data-multi-thread-application once finished. Paolo aka SlowTree ios iphone multithreading core data share improve this question The Apple Concurrency with Core Data documentation is the place to start. Read it really carefully... I was bitten many times by my misunderstandings..
Help with multi-threading on iOS? http://stackoverflow.com/questions/4360591/help-with-multi-threading-on-ios advice that would help me solve this problem. iphone multithreading ios nsthread share improve this question The Concurrency Programming Guide by Apple is a nice reading. Concurrent programming is not something you might want to pick up by copying..
index 0 beyond bounds for empty array error http://stackoverflow.com/questions/4870600/index-0-beyond-bounds-for-empty-array-error
Concurrency and serial queues in Grand Central Dispatch http://stackoverflow.com/questions/5026043/concurrency-and-serial-queues-in-grand-central-dispatch and serial queues in Grand Central Dispatch OK I love Grand Central Dispatch and after using it with relative success but..
Should I use multiple threads within my OpenGL ES game? http://stackoverflow.com/questions/5246189/should-i-use-multiple-threads-within-my-opengl-es-game you can only communicate to an OpenGL ES context using a single thread at a time. Apple has an entire section entitled Concurrency and OpenGL ES in their OpenGL ES Programming Guide for iOS. In that they describe several scenarios for improving performance.. a simple topic but Apple has made this a lot easier through Grand Central Dispatch so I highly recommend reading their Concurrency Programming Guide which describes this and other techniques for achieving multithreading in your application. Additionally..
Wait and notify equivalent in Objective c? http://stackoverflow.com/questions/6229319/wait-and-notify-equivalent-in-objective-c you could use. You can use NSCondition or POSIX semaphores or dispatch semaphores or by using run loops. Check out the Concurrency Guide and the the Threading Guide . My personal favourite at the moment is the dispatch semaphore . share improve this..
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 dispatch share improve this question I strongly suggest you to read the chapter called Dispatch Queues in Apple's Concurrency Programming Guide. It is an excellent document and clearly depicts the differences with standard multi thread programming...
http://stackoverflow.com/questions/964207/sqlite-exception-sqlite-busy
iOS5 NSManagedObjectContext Concurrency types and how are they used? http://stackoverflow.com/questions/9657760/ios5-nsmanagedobjectcontext-concurrency-types-and-how-are-they-used NSManagedObjectContext Concurrency types and how are they used Literature seems a bit sparse at the moment about the new NSManagedObjectContext concurrency.. Below is how I'm interpreting each type. Please correct me if I'm understanding anything incorrectly. NSConfinementConcurrencyType This type has been the norm over the last few years. MOC's are shielded from each thread. So if thread A MOC wants to.. Thread B MOC via a save message thread A would need to subscribe to thread B's MOC save notification. NSPrivateQueueConcurrencyType Each MOC tree parent children MOCs share the same queue no matter what thread each is on. So whenever a save message..
Objective-C, cancel a dispatch queue using UI event http://stackoverflow.com/questions/10066897/objective-c-cancel-a-dispatch-queue-using-ui-event Once I comment 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..
NSManagedObjectContext performBlockAndWait: doesn't execute on background thread? http://stackoverflow.com/questions/11831946/nsmanagedobjectcontext-performblockandwait-doesnt-execute-on-background-thread NSPrivateQueueConcurrencyType return backgroundMOC Notice that it is declared with a private queue concurrency type so its tasks should be run on a background thread. I have the following code void testThreading ok self.backgroundMOC..
Should I connect directly to CouchDB's socket and pass HTTP requests or use node.js as a proxy? http://stackoverflow.com/questions/3618052/should-i-connect-directly-to-couchdbs-socket-and-pass-http-requests-or-use-node iphone sockets couchdb node.js appcelerator share improve this question It's me again. CouchDB inherits super concurrency handling from Erlang the language it was written in. Erlang uses lightweight processes and message passing between those.. one thing at a time. Both should easily handle tens of thousands of connections but I would expect CouchDB to handle concurrency better and with less effort on your part than Node. And keep in mind that Node adds some latency if you put it in front..
Interlocked operations in iOS? http://stackoverflow.com/questions/4862308/interlocked-operations-in-ios by main thread main thread mustn't work while other threads work . I don't know how to do it. iphone objective c ios concurrency share improve this question You can use the OSAtomicIncrement OSAtomicDecrement operations described in Using Atomic..
What are the Dangers of Method Swizzling in Objective C? http://stackoverflow.com/questions/5339276/what-are-the-dangers-of-method-swizzling-in-objective-c load . The load class method is executed serially at the start of your application. You won't have any issues with concurrency if you do your swizzling here. If you were to swizzle in void initialize however you could end up with a race condition..
What are the tradeoffs between performSelector:withObject:afterDelay: and dispatch_after http://stackoverflow.com/questions/6205998/what-are-the-tradeoffs-between-performselectorwithobjectafterdelay-and-dispat block scheduling thing when you simply need to delay some selector execution in your UI without much a requirement for concurrency in general I would use performSelector . If you think about it performSelector gives you a very poor concurrency since it.. for concurrency in general I would use performSelector . If you think about it performSelector gives you a very poor concurrency since it simply schedules your selector for execution on the run loop after a minimum amount of time. On the other hand..
Core Data's NSPrivateQueueConcurrencyType and sharing objects between threads http://stackoverflow.com/questions/8637921/core-datas-nsprivatequeueconcurrencytype-and-sharing-objects-between-threads between the bg queue and the main queue Do I still need to use the managed object IDs to do that iphone core data concurrency ios5 share improve this question When you use NSPrivateQueueConcurrencyType you need to do anything that touches that..
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 blocks 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..
iOS5 NSManagedObjectContext Concurrency types and how are they used? http://stackoverflow.com/questions/9657760/ios5-nsmanagedobjectcontext-concurrency-types-and-how-are-they-used types and how are they used Literature seems a bit sparse at the moment about the new NSManagedObjectContext concurrency types. Aside from the WWDC 2011 vids and some other info I picked up along the way I'm still having a hard time grasping.. from the WWDC 2011 vids and some other info I picked up along the way I'm still having a hard time grasping how each concurrency type is used. Below is how I'm interpreting each type. Please correct me if I'm understanding anything incorrectly. NSConfinementConcurrencyType.. Isn't this the same as not using threads iphone ios nsmanagedobjectcontext share improve this question The queue concurrency types help you to manage mutlithreaded core data For both types the actions only happen on the correct queue when you do..
How to modify the priority of a custom GCD queue? http://stackoverflow.com/questions/9965018/how-to-modify-the-priority-of-a-custom-gcd-queue low priority by default. How can I change the priority of this queue Or is there something else I must do iphone ios concurrency grand central dispatch share improve this question If you're doing UIKit stuff in your block that's running on the secondary..
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