What does the primitive do? Increase an integer value by 1 Return the original value It’s a hardware primitive, hence atomic. It can be used to implement a ticket lock. How it works Say t0, t1, t2 both arrives at line 12 Since FetchAndAdd() is atomic, the changes made by threads are serialized. Let’s assume …
Lock stripping: Use different locks for different purposes on the whole data structure. For example, a read lock + a write lock Lock splitting: Use multiple locks for different parts of a data structure. For example, 16 locks are used for a ConcurrentHashMap, each guards N/16 buckets (N = total number of buckets)
Remember replace “\r\n” with “\n” after you finish. Otherwise you will some errors that you won’t understand, such as
All code that calls useMediaQuery(query) will be marked as error Your useMediaQuery2 may be still calling useMediaQuery , but it will call it with more than one arguments. So it is still valid