grand-central-dispatch

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Assigning values within block with GCD

Im executing a thread that keeps looking for updates from a web site. It should be possible to set the refresh rate in some view.[详细]

2023-03-08 01:25 分类：问答
Overrelease issue with block-captured objects; retain count jumps straight from +2 to 0!

I\'m confused by an occasional crash that I\'m seeing, which, according to the Zombies instrument, is caused by the over-release of some dictionary values. When I look at the object history for one of[详细]

2023-03-06 08:04 分类：问答
Using block or NSOperation for loading Image?

I need to know if it\'s better to use NSOperation o开发者_Go百科r Block to load a large number of image into a UIScrollView? I create all the Imageview and positioning each UIImageView in the right po[详细]

2023-03-05 16:03 分类：问答
How to upload big image asynchronously with NSURLConnection?

Now, I\'m trying to upload photo image to Facebook by using FBConnect. I succeeded in uploading image from main thread but, it blocks user interface quite long time.[详细]

2023-03-05 13:28 分类：问答
How is dispatch_debug supposed to be used?

I am struggling with a deadlock in my GCD code. Then I saw this function dispatch_debug in the header file <dispatch/object.h>.[详细]

2023-03-05 06:50 分类：问答
mercurial collaboration results in multiple commits of the same changes when using central repository

I\'ve been using mercurial with a central repository. As two or more of us work on changes we commit locally. At some point we push these changes back to the central repository.[详细]

2023-02-28 16:33 分类：问答
Grand Central Dispatch vs. NSThread

I created some test code for NSThread and Grand Central Dispatch (GCD): - (void)doIt:(NSNumber *)i { sleep(1);[详细]

2023-02-25 13:04 分类：问答
GCD to perform task in main thread

I have a callback which might come from any thread. When I get this callback, then I would like to perform a certain task on the main thread.[详细]

2023-02-25 00:19 分类：问答
dispatch_apply with local variable declaration doesn't compile in C++ method implementation

The code class XXX { vector<Record> getAll() { dispatch_apply(3, dispatch_get_global_q开发者_StackOverflowueue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(size_t i) {[详细]

2023-02-24 07:15 分类：问答
Memory leaks when generating dispatch source timer events

We are using dispatch queues to generate timer events. Following is the code which does the task: dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);[详细]

2023-02-23 17:56 分类：问答