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_putc_nolock, _putwc_nolock

  • Straipsnis

Writes a character to a stream without locking.

Syntax

int _putc_nolock(
   int c,
   FILE *stream
);
wint_t _putwc_nolock(
   wchar_t c,
   FILE *stream
);

Parameters

c
Character to be written.

stream
Pointer to the FILE structure.

Return value

See putc, putwc.

Remarks

_putc_nolock and _putwc_nolock are identical to the versions without the _nolock suffix 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.

_putwc_nolock is the wide-character version of _putc_nolock; the two functions behave identically if the stream is opened in ANSI mode. _putc_nolock doesn't currently support output into a UNICODE stream.

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.

Generic-text routine mappings

Tchar.h routine _UNICODE and _MBCS not defined _MBCS defined _UNICODE defined
_puttc_nolock _putc_nolock _putc_nolock _putwc_nolock

Requirements

Routine Required header
_putc_nolock <stdio.h>
_putwc_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.

Libraries

All versions of the C run-time libraries.

Example

// crt_putc_nolock.c
/* This program uses putc to write buffer
* to a stream. 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;
   /* Make standard out the stream and write to it. */
   stream = stdout;
   for( p = buffer; (ch != EOF) && (*p != '\0'); p++ )
      ch = _putc_nolock( *p, stream );
}

Output

This is the line of output

See also

Stream I/O
fputc, fputwc
getc, getwc