How to ensure thread-safe use of "NSCalendar currentCalendar"?

Question

According to Apple Docs NSCalendar is not thread-safe. How can I ensure thread-safety when I use the static method currentCalendar ?

Any library could call the same method. How can I lock the access?

Answer 1

You can use NSLock.

NSLock *lock = [[NSLock alloc] init];

and

[lock lock];
//calendar
[lock unlock];