Thanks Dave, that's awesome! Just what I was looking for! Q: When a context object is set with dispatch_set_context(), is it retained? Or do I need to retain it first, set it, and then in the cancel handler release it?
-Jon On Jan 5, 2011, at 11:15 AM, Dave Zarzycki wrote: > Jonathon, > > GCD is an object oriented API done in C. If you look at the man page entitled > dispatch_object, you'll see that one can call dispatch_set_context() and > dispatch_get_context() against any GCD object (sources and queues are where > they make the most sense). In fact, if you're simply looking for a "goodbye > kiss" when the last reference to a GCD object is dropped (via > dispatch_retain() and dispatch_release()), then your code can install a > finalizer via dispatch_set_finalizer_f(), which is passed the same context > managed by the aforementioned API. > > Have fun, > > davez > > > On Jan 5, 2011, at 10:58 AM, Jonathon Kuo wrote: > >> When a GCD source gets cancelled, either via dispatch_source_cancel() or >> because the source went away, I have no context other than the >> dispatch_source_t source variable. How can I know for which source a source >> cancel handler gets invoked? I have many simultaneous sources (sockets, >> files, etc) and when a source cancel handler gets called I have no idea what >> source it's for, so I can't do cleanup. Is dispatch_source_t queryable? Is >> there a way to attach a userInfo object to it? Do I have to manage this >> externally in a table myself?_______________________________________________ >> >> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) >> >> Please do not post admin requests or moderator comments to the list. >> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >> >> Help/Unsubscribe/Update your Subscription: >> http://lists.apple.com/mailman/options/cocoa-dev/zarzycki%40apple.com >> >> This email sent to zarzy...@apple.com > > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
