Mida te saate öelda Reader-Writer probleemi kohta?

The Reader-Writer problem occurs when multiple threads access a shared resource simultaneously, where some only read data (readers), and others modify it (writers).

The main goal is to ensure:

• Multiple readers can read simultaneously without locks (to improve performance).
• Prevent simultaneous access of a writer with other writers or readers, to avoid race conditions and inconsistent data.

Special synchronization mechanisms called Reader-Writer locks are used. They allow:

• Multiple threads to read at the same time.
• Writing to occur exclusively, blocking others.

This improves performance compared to regular mutexes, which block access entirely.

In iOS/Swift, for similar tasks, you can use DispatchQueue with barriers (barrier), or NSLock/pthread_rwlock_t to implement Reader-Writer locks.