NSLock
extension NSLock
-
Locks the lock, executes the
block
and unlocks the lock returning the value from theblock
.Example
let lock = NSLock() let counter = 0 DispatchQueue.concurrentPerform(iterations: 100) { _ in lock { counter += 1 } }
Declaration
Swift
public func callAsFunction<ReturnValue>(_ block: () throws -> ReturnValue) rethrows -> ReturnValue