_putchar_nolock, _putwchar_nolock

Article
06/05/2017

The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.

The latest version of this topic can be found at _putchar_nolock, _putwchar_nolock.

Writes a character to stdout without locking the thread.

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 are not protected from interference by other threads. They might be faster because they do not 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 is not supported in Windows 8.x Store 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 Windows 8.x Store 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

Share via