[interfacekit] BLooper in BWindow

I just got another "idea" - much better than snoozing for a while (and 
then checking the ports) would be to wait for a shorter amount of time 
on one port.
Just snoozing would have many disadvantages, for example it could slow 
down message handling.
In my first mail, I suggested you to use another BLooper for this - 
while this would probably be the cleanest solution, it would create the 
need for two threads for just one window, which is too generous for a 
resource as limited as this.

To implement something like this, I would select the port where it is 
crucial to react quickly on messages, like incoming mouse positions, or 
whatever you prefer. When you got a message at that port, or the 
read=5Fport=5Fetc() function timed out, I would then check for messages on 
the other port with a timeout of zero.

So it would look like this (in pseudo code):

waitFor =3D reasonableAmountOfTime;

while (isRunning) {
        status =3D read=5Fport=5Fetc(port1, B=5FRELATIVE=5FTIMEOUT, waitFor);
        if (status =3D=3D B=5FOK)
                handlePort1();

        status =3D read=5Fport=5Fetc(port2, B=5FRELATIVE=5FTIMEOUT, 0);
        if (status =3D=3D B=5FOK)
                handlePort2();
} 

If you need better timing, I would use an absolute timeout with an 
increasing amount like:

while (isRunning) {
        waitUntil +=3D waitFor;
        ...
}

Until we have wait=5Ffor=5Fmultiple=5Fobjects(), I think this is the cleanest 
solution we can come up with for a BWindow.
Thoughts=3F

Adios...
   Axel.

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