wait_on_bit — wait for a bit to be cleared
int wait_on_bit ( | unsigned long * word, |
| int bit, | |
unsigned mode); |
wordthe word being waited on, a kernel virtual address
bitthe bit of the word being waited on
modethe task state to sleep in
There is a standard hashed waitqueue table for generic use. This
is the part of the hashtable's accessor API that waits on a bit.
For instance, if one were to have waiters on a bitflag, one would
call wait_on_bit in threads waiting for the bit to clear.
One uses wait_on_bit where one is waiting for the bit to clear,
but has no intention of setting it.
Returned value will be zero if the bit was cleared, or non-zero
if the process received a signal and the mode permitted wakeup
on that signal.