3 ms·
dispatch_once(3)[0] can be used for lazy initialization without concern for the calling class and without synchronizing on a shared object. This is (likely) che
by jonhohle 13y ago
dispatch_once(3)[0] can be used for lazy initialization without concern for the calling class and without synchronizing on a shared object. This is (likely) cheaper in most cases then entering a @synchronized block.
0 - https://developer.apple.com/library/mac/documentation/Darwin/Reference/Manpages/man3/dispatch_once.3.html https://developer.apple.com/library/mac/documentation/Darwin...
- chrisdevereux 13y agoYes. In general, either GCD or lower level atomic ops are a better choice for thread-safety than @synchronized blocks. Just pointing out that there are reasons other than global mutable state for wanting a critical section in a class method.