How to send selectors or blocks to an NSRunLoop to perform?

You have all the necessary pieces together in your question. You start your thread and have it run it’s runloop. If you need the thread to do something you can use performSelector:onThread: on the main thread to do it.

Consider using NSConditionLock. It is designed for tasks like this. Imagine that you have a queue with data.

First thread adds data to queue, second thread waits for data and processes it.

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