How many stacks and heaps can an application have?

In a standard iOS application, each thread has its own stack. Therefore, the number of stacks equals the number of threads in the application.

The heap in the application is mainly one. Objects created on the heap are accessible from any thread if there is a reference to them. However, in certain scenarios, such as when using some frameworks or libraries, additional private heaps may be created for specific purposes. But in a basic understanding, a single global heap is used for main memory allocation.

In summary:

• Stacks: The number equals the number of threads.
• Heap: Mainly one, with possible additional private heaps in specific cases.