Question

Here is the things I need to do…

-(unsigned int)doSomething
{
    msg_id++;

    //something need to be done after returning
    //process

    return msg_id;
}

[somebody doSomething];

Now the process is like this:

1. somebody called doSomething
2. Process is executed
3. Msg id is returned

The flow I wanna:

1. somebody called doSomething
2. Msg id is returned
3. Process is executed

You can ask me to do when somebody doSomething is finished, but I can’t change this part. I can only change the doSomething method. Also, some workaround suggestions is calling a delay after X seconds. But I concern the after delay X second. Because I don’t know return msg_id need how many second, actually.
Any better suggestion?

Answer 1

CS101. return, does just that. It returns. Perhaps, you want ‘process’ to be something that is done in the background, or on a separate thread? You might be looking at this then:

-(unsigned int)doSomething
{
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
        //something need to be done after returning
        //process
    });

    return msg_id;
}

In any case, I think you need to rethink your logic.