WAIT_ON_BIT_LOCK(9) Driver Basics WAIT_ON_BIT_LOCK(9)NAMEwait_on_bit_lock - wait for a bit to be cleared, when wanting to set it
SYNOPSIS
int wait_on_bit_lock(void * word, int bit, int (*action) (void *),
unsigned mode);
ARGUMENTS
word
the word being waited on, a kernel virtual address
bit
the bit of the word being waited on
action
the function used to sleep, which may take special actions
mode
the task state to sleep in
DESCRIPTION
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 when one
intends to set it, for instance, trying to lock bitflags. For instance,
if one were to have waiters trying to set bitflag and waiting for it to
clear before setting it, one would call wait_on_bit in threads waiting
to be able to set the bit. One uses wait_on_bit_lock where one is
waiting for the bit to clear with the intention of setting it, and when
done, clearing it.
COPYRIGHTKernel Hackers Manual 3.11 November 2013 WAIT_ON_BIT_LOCK(9)
