_putch_nolock, _putwch_nolock

Writes a character to the console without locking the thread.


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

int _putch_nolock( 
int c 
wint_t _putwch_nolock( 
wchar_t c 


  • 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.


_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







Required header





For more compatibility information, see Compatibility.


All versions of the C run-time libraries.

See Also


Console and Port I/O

_cprintf, _cprintf_l, _cwprintf, _cwprintf_l

_getch, _getwch