threads and audio read

[DM <isaac@belial.pl.eu.org>]

	Hello. 

	I'm trying to port to openbsd a threaded application that reads 
from audio device (ices2). Whenever application tries to read(2)
sth from audio -pthread library changes read function to poll 
( it is what ktrace says ). But poll always fails ( data
will be grabbed from a sound card when a real read is issued, 
so an input buffer is emtpy). The result : application is unable
to read anything from /dev/audio.
	Is there any way to say in pthreads: I want to perform 
read even it would block a whole process?


TIA,

DM