[asterisk-dev] There's something I'm not getting in chan_oss.c

[Juan Carlos Castro y Castro]

For every defined soundcard, a sound_thread() thread is created that 
keeps on (among other things) reading sound from the microphone and 
discarding it. It would seem to me that this thread and the normal 
ast_waitforXXX() that's continually called during a call would compete 
like mad for grabbing the microphone data. Since this channel type more 
or less works, there's obviously something I'm not reading right. What 
is it?