_putch_nolock, _putwch_nolock

Article
06/05/2017

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The latest version of this topic can be found at _putch_nolock, _putwch_nolock.

Writes a character to the console without locking the thread.

Important

This API cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported with /ZW.

Syntax

  
      int _putch_nolock(  
int c  
);  
wint_t _putwch_nolock(  
wchar_t c  
);

Parameters

c
Character to be output.

Return Value

Returns c if successful. If _putch_nolock fails, it returns EOF; if _putwch_nolock fails, it returns WEOF.

Remarks

_putch_nolock and _putwch_nolock are identical to _putch and _putwch, respectively, 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
_puttch_nolock	_putch_nolock	_putch_nolock	_putwch_nolock

Requirements

Routine	Required header
_putch_nolock	<conio.h>
_putwch_nolock	<conio.h>

For more compatibility information, see Compatibility.

Libraries

All versions of the C run-time libraries.

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