RecLock

RecLock.m

@implementation TestMutex {
    NSRecursiveLock *recLock;
}

- (instancetype)init {
    if (self = [super init]) {
        
        // Initialize the mutex
        recLock = [[NSRecursiveLock alloc] init];
    }
    
    return self;
}

- (void)process:(NSUInteger)value {
    [recLock lock];
    
    if (value != 0) {
        --value;
        [self process:value];
    }
    
    [recLock unlock];
}

@end