Question

When trying code that looks like this, mainly for testing

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NSInvocationOperation *operation = [NSInvocationOperation alloc];
operation = [operation initWithTarget:self 
                             selector:@selector(dosignup:) 
                               object:params];   

while ( ![operation isFinished] ) [NSThread sleepForTimeInterval:0.1];

[operation release];

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The dosignup never gets called. So then I have to assume that the selector does not get called until the main thread processes this, not at time of queue insert like a fork and / or a thread on .NET… Anyway to force the queue to processes the thread?

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Answer 1

you have to add your operation to a NSOperationQueue or you have to start it manually.

NSOperationQueue *queue = [[NSOperationQueue alloc] init];

NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(dosignup:) object:params];
[queue addOperation:operation];
[operation release];

[queue release];

or

NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(dosignup:) object:params];
[operation start];

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But I don’t know what you really want to do, because your code makes only little sense right now.