mikeash.com pyblog/friday-qa-2015-09-04-lets-build-dispatch_queue.html comments

Hery R - 2015-10-05 14:06:13

Mon, 05 Oct 2015 14:06:13 GMT

Cool! Sounds like a more elaborated version of a problem I had to solve on a Google interview.

Michael M. Mayer - 2015-09-15 20:12:54

Tue, 15 Sep 2015 20:12:54 GMT

Mike - Another great expose of an interesting topic. As always I learned new things (NSCondition and spurious wake up). Your solution is also a design pattern that will no doubt be useful to me in the future. Thank you.

elfenlaid - 2015-09-07 12:32:10

Mon, 07 Sep 2015 12:32:10 GMT

dispatch_once was described here https://mikeash.com/pyblog/friday-qa-2014-06-06-secrets-of-dispatch_once.html

Andrew Hershberger - 2015-09-05 00:53:36

Sat, 05 Sep 2015 00:53:36 GMT

Thanks for another great article!

I noticed that it uses less-than when comparing the blocks count to the number of idle threads: if([_blocks count] < idleThreads…. The source on GitHub shows greater-than, which I believe is correct.

mikeash - 2015-09-04 14:38:56

Fri, 04 Sep 2015 14:38:56 GMT

You can see various rebuilds in my article linked on dispatch_once. For convenience, the URL:

https://mikeash.com/pyblog/friday-qa-2014-06-06-secrets-of-dispatch_once.html

David Dunham - 2015-09-04 14:15:47

Fri, 04 Sep 2015 14:15:47 GMT

Can we see the dispatch_once magical rebuild?