2014/10/15 下午 10:13:51

iphone Programming Glossary: semaphore

UITableView & UIScrollview stop cocos2d animations

http://stackoverflow.com/questions/15185720/uitableview-uiscrollview-stop-cocos2d-animations

. The question is what is the reason of such freezing and how can i avoid it void mainLoop id sender if dispatch_semaphore_wait frameRenderingSemaphore DISPATCH_TIME_NOW 0 return if self.useCocoaFriendlyRendering dispatch_sync frameRenderingDispatchQueue.. CCGLView openGLview CCGLView self view EAGLContext setCurrentContext openGLview.context self drawScene dispatch_semaphore_signal frameRenderingSemaphore else CCGLView openGLview CCGLView self view EAGLContext setCurrentContext openGLview.context.. else CCGLView openGLview CCGLView self view EAGLContext setCurrentContext openGLview.context self drawScene dispatch_semaphore_signal frameRenderingSemaphore iphone ios objective c uitableview cocos2d share improve this question The reason is..

How to unit test asynchronous APIs?

http://stackoverflow.com/questions/2162213/how-to-unit-test-asynchronous-apis

to using the XCode built in XCTest system and have found that TVRSMonitor on Github provides a dead easy way to use semaphores to wait for async operations to complete. For example void testLogin TRVSMonitor monitor TRVSMonitor monitor __block NSString.. solution that works for me. I use the classic approach for turning async operations into a sync flow by using a semaphore as follows create the object that will perform an async operation MyConnection conn MyConnection new STAssertNotNil conn.. an async operation MyConnection conn MyConnection new STAssertNotNil conn @ MyConnection init failed create the semaphore and lock it once before we start the async operation NSConditionLock tl NSConditionLock new self.theLock tl tl release start..

objective-c : @synchronized, how does it work?

http://stackoverflow.com/questions/2810459/objective-c-synchronized-how-does-it-work

2 be locked for other threads or other threads can access critical section 2. iphone objective c multithreading semaphore share improve this question Critical section 2 will be blocked to other threads as well since you're synchronizing on..

iPhone use of mutexes with asynchronous URL requests

http://stackoverflow.com/questions/554270/iphone-use-of-mutexes-with-asynchronous-url-requests

@synchronized someArray modify array If you need to protect more than just one variable you should consider using a semaphore that represents access to that set of data. Get the semaphore. id groupSemaphore Group semaphore @synchronized groupSemaphore..

Wait and notify equivalent in Objective c?

http://stackoverflow.com/questions/6229319/wait-and-notify-equivalent-in-objective-c

share improve this question There are numerous techniques 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.. this question There are numerous techniques 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..

Using Grand Central Dispatch, how can I check if there is a block already running?

http://stackoverflow.com/questions/6694439/using-grand-central-dispatch-how-can-i-check-if-there-is-a-block-already-runnin

question If you wanted to prevent two blocks of the same type from running at the same time you could use a dispatch semaphore. With a semaphore set to a count of 1 you can check the semaphore before firing off the block and bail if something is still.. wanted to prevent two blocks of the same type from running at the same time you could use a dispatch semaphore. With a semaphore set to a count of 1 you can check the semaphore before firing off the block and bail if something is still running. At the.. running at the same time you could use a dispatch semaphore. With a semaphore set to a count of 1 you can check the semaphore before firing off the block and bail if something is still running. At the end of the block you signal the semaphore to..

Wait for assetForURL blocks to be completed

http://stackoverflow.com/questions/7234445/wait-for-assetforurl-blocks-to-be-completed

doesn't allow location in your app iphone objective c alasset alassetslibrary share improve this question GCD semaphore approach dispatch_semaphore_t sema dispatch_semaphore_create 0 dispatch_queue_t queue dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT.. your app iphone objective c alasset alassetslibrary share improve this question GCD semaphore approach dispatch_semaphore_t sema dispatch_semaphore_create 0 dispatch_queue_t queue dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 for.. c alasset alassetslibrary share improve this question GCD semaphore approach dispatch_semaphore_t sema dispatch_semaphore_create 0 dispatch_queue_t queue dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_DEFAULT 0 for NSURL url in self.assetUrls..

Why does this code cause “EXC_BAD_INSTRUCTION”?

http://stackoverflow.com/questions/8287621/why-does-this-code-cause-exc-bad-instruction

does this code cause &ldquo EXC_BAD_INSTRUCTION&rdquo dispatch_semaphore_t aSemaphore dispatch_semaphore_create 1 dispatch_semaphore_wait aSemaphore DISPATCH_TIME_FOREVER dispatch_release aSemaphore.. does this code cause &ldquo EXC_BAD_INSTRUCTION&rdquo dispatch_semaphore_t aSemaphore dispatch_semaphore_create 1 dispatch_semaphore_wait aSemaphore DISPATCH_TIME_FOREVER dispatch_release aSemaphore When the program runs to dispatch_release.. this code cause &ldquo EXC_BAD_INSTRUCTION&rdquo dispatch_semaphore_t aSemaphore dispatch_semaphore_create 1 dispatch_semaphore_wait aSemaphore DISPATCH_TIME_FOREVER dispatch_release aSemaphore When the program runs to dispatch_release aSemaphore it..