unlock-file.md

description	Learn more about: _unlock_file
title	_unlock_file
ms.date	4/2/2020
api_name	_unlock_file _o__unlock_file
api_location	msvcrt.dll msvcr80.dll msvcr90.dll msvcr100.dll msvcr100_clr0400.dll msvcr110.dll msvcr110_clr0400.dll msvcr120.dll msvcr120_clr0400.dll ucrtbase.dll api-ms-win-crt-filesystem-l1-1-0.dll
api_type	DLLExport
topic_type	apiref
f1_keywords	STDIO/_unlock_file _unlock_file
helpviewer_keywords	files [C++], unlocking unlock_file function _unlock_file function unlocking files
ms.assetid	cf380a51-6d3a-4f38-bd64-2d4fb57b4369

_unlock_file

Unlocks a file, allowing other processes to access the file.

Syntax

void _unlock_file(
   FILE* file
);

Parameters

file
File handle.

Remarks

The _unlock_file function unlocks the file specified by file. Unlocking a file allows access to the file by other processes. This function shouldn't be called unless _lock_file was previously called on the file pointer. Calling _unlock_file on a file that isn't locked may result in a deadlock. For an example, see _lock_file.

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.

Requirements

Routine	Required header
_unlock_file	<stdio.h>

For more compatibility information, see Compatibility.

See also

File handling
_creat, _wcreat
_open, _wopen
_lock_file