How to make the NSOperationQueue serial?

ios objective-c nsoperationqueue
lakesh picture lakesh · Feb 21, 2013 · Viewed 13.1k times · Source

I am intending to make the NSOperationQueue serial instead of concurrent.

One way I know is:

NSOperationQueue *globalQueue;
globalQueue.maxConcurrentOperationCount =1;

Is there any other way?

Answer

Gabriel picture Gabriel · Feb 21, 2013

If you want a serial queue, you are right setting maxConcurrentOperation to one. You can also use [NSOperationQueue mainQueue] instead of creating a new queue, and so queue operations on the main thread. But that is only useful if very short operations are added and so the user interface is not blocked. And on the other hand you have not to worry about threads n synch.

You can add operations to any queue with addOperations:waitUntilFinished:YES or sending the message waitUntilAllOperationsAreFinished every time you add an operation. That way you are serializing operations instead of defining the queue as serial.

Related questions

NSOperation and NSOperationQueue working thread vs main thread

I have to carry out a series of download and database write operations in my app. I am using the NSOperation and NSOperationQueue for the same. This is application scenario: Fetch all postcodes from a place. For each postcode fetch …

Read More
How do I use NSOperationQueue with NSURLSession?

I'm trying to build a bulk image downloader, where images can be added to a queue on the fly to be downloaded, and I can find out the progress and when they're done downloading. Through my reading it seems like …

Read More
NSOperation - Forcing an operation to wait others dynamically

I am trying to implement an operation queue and I have the following scenario: NSOperation A NSOperation B NSOperation C NSOperation D NSOperationQueue queue I start adding A to queue. During the execution of A I need to get some …

Read More