Uninterrupted Audio tone generation

Hi,

I need to generate audio-tones, two different-frequency tones to encode a
binary 0 and a binary 1 such that each bit-tone occupies say 10ms exactly.
also while playing the tones for a complete packet of data (say 50-100 bits)
the audio-tones should not get interrupted.

1. I was wondering how using rtlinux can help achieve this. to ensure
no-interruptions, would i need to just write a tone-generation task as a
realtime-task or would i also need to run the audio-driver as a
realtime-task?

2. the second complication is that i also need to run another
data-collection task (not necessarily real time) that collects these packets
from a remote machine via serial-port. If i run a real-time task that needs
to continuously generate a tone, since this cannot be interrupted, would my
data-collection task get to run at all?

i have tried searching the archives but couldn't find much about audio. also
iam very new to real-time systems. all and any help greatly appreciated.

Thanks,
Vinoo
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