putc-nolock-putwc-nolock.md

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_putc_nolock, _putwc_nolock	Learn more about: _putc_nolock, _putwc_nolock	4/2/2020	_putc_nolock _putwc_nolock _o__putc_nolock _o__putwc_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	_puttc_nolock puttc_nolock putwc_nolock _putwc_nolock _putc_nolock putc_nolock	puttc_nolock function putc_nolock function _putc_nolock function streams, writing characters to characters, writing putwc_nolock function _puttc_nolock function _putwc_nolock function

_putc_nolock, _putwc_nolock

Writes a character to a stream without locking.

Syntax

int _putc_nolock(
   int c,
   FILE *stream
);
wint_t _putwc_nolock(
   wchar_t c,
   FILE *stream
);

Parameters

c
Character to be written.

stream
Pointer to the FILE structure.

Return value

See putc, putwc.

Remarks

_putc_nolock and _putwc_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.

_putwc_nolock is the wide-character version of _putc_nolock; the two functions behave identically if the stream is opened in ANSI mode. _putc_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
_puttc_nolock	_putc_nolock	_putc_nolock	_putwc_nolock

Requirements

Routine	Required header
_putc_nolock	<stdio.h>
_putwc_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_putc_nolock.c
/* This program uses putc to write buffer
* to a stream. 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;
   /* Make standard out the stream and write to it. */
   stream = stdout;
   for( p = buffer; (ch != EOF) && (*p != '\0'); p++ )
      ch = _putc_nolock( *p, stream );
}

Output

This is the line of output

See also

Stream I/O
fputc, fputwc
getc, getwc