Does Run Loop ensure safety when working with threads?

Run Loop in iOS does not inherently ensure thread safety. A Run Loop is a mechanism that manages events and input-output processing within a single thread.

Each thread has its own Run Loop, and it processes events only in that thread. If you want to interact with objects across different threads, you need to independently ensure synchronization and safe access to data (for example, using GCD, mutexes, semaphores).

Thus, the Run Loop helps organize the event processing cycle in a thread, but it does not solve multithreading issues or protect against data races.