locking-constants.md

description	title	ms.date	f1_keywords	helpviewer_keywords	ms.assetid
Learn more about: _locking Constants	_locking Constants	11/04/2016	LOCKING/_LK_RLCK LOCKING/_LK_NBLCK LOCKING/_LK_LOCK LOCKING/_LK_NBRLCK LOCKING/_LK_UNLCK LOCKING/LK_RLCK LOCKING/LK_NBLCK LOCKING/LK_LOCK LOCKING/LK_NBRLCK LOCKING/LK_UNLCK _LK_RLCK _LK_NBLCK _LK_LOCK _LK_NBRLCK _LK_UNLCK LK_RLCK LK_NBLCK LK_LOCK LK_NBRLCK LK_UNLCK	LK_UNLCK constant LK_NBRLCK constant _LK_NBRLCK constant _LK_NBLCK constant _LK_LOCK constant LK_NBLCK constant _LK_UNLCK constant LK_RLCK constant _LK_RLCK constant LK_LOCK constant	c3dc92c8-60e3-4d29-9f50-5d217627c8ad

_locking constants

Syntax

#include <sys/locking.h>

Remarks

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 can't be locked, the function tries again after 1 second. If the bytes can't be locked after 10 attempts, the function returns an error.
_LK_RLCK	Same as _LK_LOCK.
_LK_NBLCK	Locks the specified bytes. If bytes can't 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.)

See also

_locking
Global constants