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_putch_nolock, _putwch_nolock

Writes a character to the console without locking the thread.

int _putch_nolock(
   int c
wint_t _putwch_nolock(
   wchar_t c


Character to be output.

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.