Can you provide an example of a situation where resource deadlock occurs in a system?

A deadlock occurs when two or more processes (or threads) wait for each other, holding resources that are needed by others to continue working.

Example situation:

• Thread A acquires resource 1 and tries to get resource 2.
• Thread B acquires resource 2 and tries to get resource 1.

Both threads are waiting for each other to release resources, and neither can continue working.

In iOS, this can happen, for example, when using multiple locks or queues, where the order of resource acquisition is not controlled. To avoid deadlocks, it is important to follow a resource acquisition order or use timeouts and other synchronization mechanisms.