getchar-nolock-getwchar-nolock.md

title	description	ms.date	api_name	api_location	api_type	topic_type	f1_keywords	helpviewer_keywords
_getchar_nolock, _getwchar_nolock	Learn more about: _getchar_nolock, _getwchar_nolock	11/04/2016	_getchar_nolock _getwchar_nolock	msvcrt.dll msvcr80.dll msvcr90.dll msvcr100.dll msvcr100_clr0400.dll msvcr110.dll msvcr110_clr0400.dll msvcr120.dll msvcr120_clr0400.dll ucrtbase.dll	DLLExport	apiref	getwchar_nolock _getwchar_nolock _getchar_nolock getchar_nolock	_getwchar_nolock function getwchar_nolock function characters, reading _getchar_nolock function getchar_nolock function standard input, reading from

_getchar_nolock, _getwchar_nolock

Reads a character from the standard input without locking.

Syntax

int _getchar_nolock( void );
wint_t _getwchar_nolock( void );

Return value

See getchar, getwchar.

Remarks

_getchar_nolock and _getwchar_nolock are identical to getchar and getwchar except that they aren't protected from interference by other threads. They might be faster because they don't incur the overhead of locking out other threads. Use these functions only in thread-safe contexts such as single-threaded applications or where the calling scope already handles thread isolation.

Generic-text routine mappings

Tchar.h routine	_UNICODE and _MBCS not defined	_MBCS defined	_UNICODE defined
_gettchar_nolock	_getchar_nolock	_getchar_nolock	_getwchar_nolock

Requirements

Routine	Required header
_getchar_nolock	<stdio.h>
_getwchar_nolock	<stdio.h> or <wchar.h>

The console isn't supported in Universal Windows Platform (UWP) apps. The standard stream handles that are associated with the console, stdin, stdout, and stderr, must be redirected before C run-time functions can use them in UWP apps. For more compatibility information, see Compatibility.

Example

// crt_getchar_nolock.c
// Use _getchar_nolock to read a line from stdin.

#include <stdio.h>

int main()
{
    char buffer[81];
    int i, ch;

    for (i = 0; (i < 80) && ((ch = _getchar_nolock()) != EOF)
                         && (ch != '\n'); i++)
    {
        buffer[i] = (char) ch;
    }

    // Terminate string with a null character

    buffer[i] = '\0';
    printf( "Input was: %s\n", buffer);
}

This textInput was: This text

See also

Stream I/O
getc, getwc
fgetc, fgetwc
_getch, _getwch
putc, putwc
ungetc, ungetwc