Hello Jens, and thanks for the very useful information. I still don't quite understand how to employ CFWriteStreamSetDispatchQueue. Can an NSOperation somehow obtain the dispatch_queue on which it is running?
I know NSOperationQueue has an accessor for its underlying dispatch_queue, but actual NSOperations are spawned in arbitrary threads - so I'm not sure about their dispatch_queue (if they run on a dispatch_queue at all). Supposedly I'd schedule my output stream on the OperationQueue's dispatch_queue. What kind of synchronization can I expect? Does this promise that stream events won't happen concurrently as my NSOperation's main()? Also - If I need to reschedule the stream to each operation's dispatch_queue (provided they can each have a different one) is it advisable to reschedule a stream mid-running? how costly this is? Can I lose events that way? However - my original hesitation remains - On 11 בנוב 2015, at 18:53, Jens Alfke wrote: > >> On Nov 11, 2015, at 3:46 AM, Motti Shneor <su...@bezeqint.net> wrote: >> >> If I (upon starting my operation) schedule the outputStream on the current >> operation’s runloop like thus: >> >> [self.outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] >> forMode:NSDefaultRunLoopMode]; > > That won’t work because dispatch queues (other than main) and > NSOperationQueues don’t have runloops. (If you call +currentRunLoop you do > create a new runloop for whatever thread the queue is using, but that runloop > won’t do anything because there’s no outer loop on that thread servicing it.) > >> If I can change the outputStream’s scheduling to use the same of my >> currently running operation - that should solve my synchronizing problem. My >> operation can bail safely, and be re-called on its own thread, without >> concurrency. > > You can use CFWriteStreamSetDispatchQueue to schedule the stream on a queue > instead of a runloop. > > —Jens Motti Shneor, CEO, suMac LTD. Software Development for the Macintosh Home/Office Address: 34 Emek-Ha-Ella St. Appt.1 Modiin, ISRAEL, 71723 Home/Office Tel/Fax: +972-8-9267730 Home eMail: motti.shn...@gmail.com Office eMail: su...@bezeqint.net Mobile phone: +972-54-3136621 --- ceterum censeo microsoftiem delendam esse ---
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