fputc-nolock-fputwc-nolock.md

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_fputc_nolock, _fputwc_nolock	Learn more about: _fputc_nolock, _fputwc_nolock	4/2/2020	_fputwc_nolock _fputc_nolock _o__fputc_nolock _o__fputwc_nolock	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-stdio-l1-1-0.dll	DLLExport	apiref	_fputc_nolock fputwc_nolock fputc_nolock fputtc_nolock _fputwc_nolock _fputtc_nolock	streams, writing characters to fputwc_nolock function fputtc_nolock function _fputc_nolock function fputc_nolock function _fputtc_nolock function _fputwc_nolock function

_fputc_nolock, _fputwc_nolock

Writes a character to a stream without locking.

Syntax

int _fputc_nolock(
   int c,
   FILE *stream
);
wint_t _fputwc_nolock(
   wchar_t c,
   FILE *stream
);

Parameters

c
Character to be written.

stream
Pointer to the FILE structure.

Return value

Each of these functions returns the character written. For error information, see fputc, fputwc.

Remarks

_fputc_nolock and _fputwc_nolock are identical to fputc and fputwc, respectively, 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.

The two functions behave identically if the stream is opened in ANSI mode. _fputc_nolock doesn't currently support output into a UNICODE stream.

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

Generic-text routine mappings

Tchar.h routine	_UNICODE and _MBCS not defined	_MBCS defined	_UNICODE defined
_fputtc_nolock	_fputc_nolock	_fputc_nolock	_fputwc_nolock

Requirements

Function	Required header
_fputc_nolock	<stdio.h>
_fputwc_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_fputc_nolock.c
// This program uses _fputc_nolock
// to send a character array to stdout.

#include <stdio.h>

int main( void )
{
   char strptr1[] = "This is a test of _fputc_nolock!!\n";
   char *p;

   // Print line to stream using fputc.
   p = strptr1;
   while( (*p != '\0') && _fputc_nolock( *(p++), stdout ) != EOF ) ;

}

This is a test of _fputc_nolock!!

See also

Stream I/O
fgetc, fgetwc
putc, putwc