I have problem with NSThread subclass. It's very similar to this case - http://prod.lists.apple.com/archives/cocoa-dev/2015/Sep/msg00454.html. I have a library, that provide developer-friendly interface to AddressBook.framework. And I unable to use GCD for thread safety, because of `ABAddressBookRegisterExternalChangeCallback` function, that requires a run loop to schedule callback. So I decided to use NSThread subclass. And found that second NSThread instance blocks main thread on `start` method call. Here is the source code of Example - https://www.dropbox.com/s/r5k8o28pocu7afk/aptest.zip?dl=0 When you press 'load contacts' for the second time, it'll block main thread with `semaphore_wait_trap` Any ideas? -- Best regards, Alexey Belkevich _______________________________________________
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