grand-central-dispatch

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How does one efficiently implement file region locking using grand central dispatch?

For my project, I am reading from and writing to a file from multiple threads, so I need to implement file locking. I have tried fcntl(), however it seems that function only works with locking between[详细]

2023-03-21 06:21 分类：问答
Isn't dispatch_semaphore_wait FIFO?

The documentation for dispatch_semaphore_wait says that it \"waits in FIFO order for a signal\". But it doesn\'t seem to in this example-- can someone please explain?[详细]

2023-03-18 22:01 分类：问答
Good pattern for Internet requests with Grand Central Dispatch?

I\'m currently using synchronous ASIHTTPRequest with GCD queues to download data from the Internet, then parse the response data with JSONKit. What do you think about this pattern. Thank you in advanc[详细]

2023-03-18 11:01 分类：问答
Does suspending a dispatch queue suspend its target queue?

I want to create two serial queues A & B. Where queue B is a target of queue A. I want to queue up some blocks on B, and suspend it until i\'m ready to execute them, however i want to continue exe[详细]

2023-03-18 07:38 分类：问答
How to write into an array from a dispatch_apply (GCD) loop?

I have written code to calculate the dynamics of a large set of coupled master equation using the Runge-Kutta-method. The code contains a lot of for-loops, where each step is independent. I intend to[详细]

2023-03-18 07:35 分类：问答
Task queue on Android like in GCD on iOS?

Is there such a thing as task queue on Android? I know that it can be written by hand but is there a ready to use library开发者_运维知识库 for that?I\'m not sure if there would be a library for this o[详细]

2023-03-18 01:02 分类：问答
GCD and KVO problems

My app is want to get the albums list of the iphone and all the photos in certain album. In the app I enumerate the photos in one album of the iphone.[详细]

2023-03-17 15:36 分类：问答
dispatch_sync vs. dispatch_async on main queue

Bear with me, this is going to take some explaining. I have a function that looks like the one below.[详细]

2023-03-16 18:32 分类：问答
prevent multiple dispatch_queue_create from being created in viewDidLoad

have a view that loads and a serial dispatch queue that is created, loads a ton of stuff in the background and works great.Problem is when I navigate back and forth to开发者_JAVA技巧 that view a new q[详细]

2023-03-16 12:33 分类：问答
Using GCD in iOS

So, I was looking at some WWDC session videos again and the speaker told that if you aren开发者_如何学运维\'t using GCD already it\'s time to. So I was googling some tutorial specially for iOS and did[详细]

2023-03-16 11:22 分类：问答