UNIX for Advanced & Expert Users

hi,
wait_event_interruptible:what is the function of this api?
Can anybody plz explain?

regards
sriram

any process blocking on a read call needs to be eventually put to sleep
untill data for which the process is blocked is available,

and this api wait_event_interruptible would put the process that is blocked
to sleep state with guaranteed avoid of any race condition upon invoking the
process later

but this api needs a condition to be passed to wake up the process put to sleep