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?_______________________________________________
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