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locking-constants.md

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title ms.custom ms.date ms.reviewer ms.suite ms.technology ms.tgt_pltfrm ms.topic f1_keywords dev_langs helpviewer_keywords ms.assetid caps.latest.revision author ms.author manager
_locking Constants | Microsoft Docs
11/04/2016
cpp-standard-libraries
article
_LK_RLCK
_LK_NBLCK
_LK_LOCK
_LK_NBRLCK
_LK_UNLCK
C++
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
7
corob-msft
corob
ghogen

_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.

_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.)

See Also

_locking
Global Constants