_locking Constants

Syntax

#include <sys/locking.h>

The mode argument in the call to the _locking function specifies the locking action to be performed.

The mode argument must be one of the following manifest constants.

Value	Description
`_LK_LOCK`	Locks the specified bytes. If the bytes cannot be locked, the function tries again after 1 second. If, after 10 attempts, the bytes cannot be locked, the function returns an error.
`_LK_RLCK`	Same as `_LK_LOCK`.
`_LK_NBLCK`	Locks the specified bytes. If bytes cannot be locked, the function returns an error.
`_LK_NBRLCK`	Same as `_LK_NBLCK`.
`_LK_UNLCK`	Unlocks the specified bytes. (The bytes must have been previously locked.)