putchar-nolock-putwchar-nolock.md

title	_putchar_nolock, _putwchar_nolock
description	Learn more about: _putchar_nolock, _putwchar_nolock
ms.date	11/04/2016
api_name	_putchar_nolock _putwchar_nolock
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_type	DLLExport
topic_type	apiref
f1_keywords	putwchar_nolock _puttchar_nolock _putchar_nolock _putwchar_nolock putchar_nolock
helpviewer_keywords	_puttchar_nolock function putchar_nolock function characters, writing standard output, writing to putwchar_nolock function _putchar_nolock function _putwchar_nolock function puttchar_nolock function

_putchar_nolock, _putwchar_nolock

Writes a character to stdout without locking.

Syntax

int _putchar_nolock(
   int c
);
wint_t _putwchar_nolock(
   wchar_t c
);

Parameters

c
Character to be written.

Return value

See putchar, putwchar.

Remarks

putchar_nolock and _putwchar_nolock are identical to the versions without the _nolock suffix 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
_puttchar_nolock	_putchar_nolock	_putchar_nolock	_putwchar_nolock

Requirements

Routine	Required header
_putchar_nolock	<stdio.h>
_putwchar_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.

Libraries

All versions of the C run-time libraries.

Example

// crt_putchar_nolock.c
/* This program uses putchar to write buffer
* to stdout. If an error occurs, the program
* stops before writing the entire buffer.
*/

#include <stdio.h>

int main( void )
{
   FILE *stream;
   char *p, buffer[] = "This is the line of output\n";
   int  ch;

   ch = 0;

   for( p = buffer; (ch != EOF) && (*p != '\0'); p++ )
      ch = _putchar_nolock( *p );
}

Output

This is the line of output

See also

Stream I/O
fputc, fputwc
fgetc, fgetwc