_getchar_nolock, _getwchar_nolock

Reads a character from the standard input without locking.


int _getchar_nolock( void );
wint_t _getwchar_nolock( void );

Return value

See getchar, getwchar.


_getchar_nolock and _getwchar_nolock are identical to getchar and getwchar 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.

Generic-text routine mappings

Tchar.h routine _UNICODE and _MBCS not defined _MBCS defined _UNICODE defined
_gettchar_nolock _getchar_nolock _getchar_nolock _getwchar_nolock


Routine Required header
_getchar_nolock <stdio.h>
_getwchar_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.


// crt_getchar_nolock.c
// Use _getchar_nolock to read a line from stdin.

#include <stdio.h>

int main()
    char buffer[81];
    int i, ch;

    for (i = 0; (i < 80) && ((ch = _getchar_nolock()) != EOF)
                         && (ch != '\n'); i++)
        buffer[i] = (char) ch;

    // Terminate string with a null character

    buffer[i] = '\0';
    printf( "Input was: %s\n", buffer);

This textInput was: This text

See also

Stream I/O
getc, getwc
fgetc, fgetwc
_getch, _getwch
putc, putwc
ungetc, ungetwc