Attempts to acquire a lock before a specified moment in time.
Original signature is '- (BOOL)lockBeforeDate:(NSDate *)limit'
Available in Mac OS X v10.0 and later.
- limit (NSDate)
- The date by which the lock must be acquired or the attempt will time out.
YES if the lock is acquired within the time limit, NO otherwise.
- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)