How many blocks are running on a queue?

Asked Apr 19 '15 at 14:37

Active May 05 '15 at 11:42

Viewed 273 times

Any way to check how many blocks are running on a concurrent queue?

I want to limit running blocks in a concurrent queue, and add a new block only if this number is lower i.e. 3. Any way to do it?

The reason I read here, that maximum number of threads is 64. Above it app will freeze.

edited May 23 '17 at 11:51

Community

asked Apr 19 '15 at 14:37

János

The `dispatch_group_leave` is to be used together with `dispatch_group_enter`, but they are to be used when not using `dispatch_group_async`. More info here: https://developer.apple.com/library/mac/documentation/Performance/Reference/GCD_libdispatch_Ref/index.html#//apple_ref/c/func/dispatch_group_enter – pteofil May 04 '15 at 20:45
2

While you may be able to accomplish that with a dispatch semaphore, it would be much easier to use NSOperation with NSOperationQueue. NSOperationQueue is a higher level API and provides a more fine control over the execution of operations. – pteofil May 05 '15 at 12:04

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