What methods can be used to prevent deadlocks in multithreaded applications?

To prevent deadlocks in multithreaded applications, several methods can be used:

• Avoid nested locks: try not to acquire multiple locks simultaneously.
• Order resource acquisition: always acquire locks in the same order.
• Use timeouts: when attempting to acquire a lock, use a timeout to avoid waiting indefinitely.
• Use high-level synchronization primitives: for example, DispatchQueue in iOS, which simplifies thread management.

Example of resource acquisition ordering:

// Always acquire lockA, then lockB
lockA.lock()
lockB.lock()
// work with resources
lockB.unlock()
lockA.unlock()