I’ve been searching around the web for an answer to this one, but was unable to find an answer, on the other side I think it’s something quite common thus there is a possibility I’m missing some keywords here. Anyhow, the problem is as follows:
When is control given to a callback function in ObjC (iPhone)?
Does it happen after control is given to a high up in the hierarchy class responsible for the runloop? Can it occur in the middle of another function call being executed?
As an example, let’s take the NSURLConnection, we don’t know or can’t predict when it’s going to call didReceiveResponse or the other callback methods, can it be the case that didReceiveResponse get’s called when I’m in the middle of another function? (highly doubt that but was unable to find information on callbacks wating for the end of the run loop)
Cheers,
Kaspa
No, within a single thread, code is not executed in parallel. The runloop schedules the execution of all messages and dispatches them in sequences. Not even NSTimers are guaranteed to fire to the precision they are theoretically capable of because they have to wait for the runloop like everything else.