SKProductRequest synchronous - cocoa

Question

i start the product request already in a operation block
NSOperationQueue * queue = [[NSOperationQueue alloc] init];
[queue addOperationWithBlock:^{
SKProductsRequest * request= [[SKProductsRequest alloc] initWithProductIdentifiers: selectedSKIdentifiers];
request.delegate = self;
[request start];
}];
so i would like to use some synchronous version, like when downloading data
NSData * data = [[NSData alloc] initWithContentsOfURL:url];
or parsing XML is also synchronous
NSXMLParser * parser = [[NSXMLParser alloc] initWithData:xmlData];
[parser setDelegate:self];
[parser parse];
[parser release];
Is there a way for to do the SKProductsRequest synchronous
The apple documentation luck on further info on this topic at this day

Answer 1

i found a way how to make any method synchronous :
// create the object that will perform an async operation
MyConnection *conn = [MyConnection new];
// create the semaphore and lock it once before we start
// the async operation
self.theLock = [NSConditionLock new];
// start the async operation
self.testState = 0;
[conn doItAsyncWithDelegate:self];
// now lock the semaphore - which will block this thread until
// [self.theLock unlockWithCondition:1] gets invoked
[self.theLock lockWhenCondition:1];
// we're done
[self.theLock release];
[conn release];
Make sure to invoke!!!!!!!!!!!!!!!!!
[self.theLock unlockWithCondition:1];
In the delegate(s) then.