_fputc_nolock, _fputwc_nolock
Writes a character to a stream without locking.
Syntax
int _fputc_nolock(
int c,
FILE *stream
);
wint_t _fputwc_nolock(
wchar_t c,
FILE *stream
);
Parameters
c
Character to be written.
stream
Pointer to the FILE structure.
Return value
Each of these functions returns the character written. For error information, see fputc, fputwc.
Remarks
_fputc_nolock and _fputwc_nolock are identical to fputc and fputwc, respectively, 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.
The two functions behave identically if the stream is opened in ANSI mode. _fputc_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 |
|---|---|---|---|
_fputtc_nolock |
_fputc_nolock |
_fputc_nolock |
_fputwc_nolock |
Requirements
| Function | Required header |
|---|---|
_fputc_nolock |
<stdio.h> |
_fputwc_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.
Example
// crt_fputc_nolock.c
// This program uses _fputc_nolock
// to send a character array to stdout.
#include <stdio.h>
int main( void )
{
char strptr1[] = "This is a test of _fputc_nolock!!\n";
char *p;
// Print line to stream using fputc.
p = strptr1;
while( (*p != '\0') && _fputc_nolock( *(p++), stdout ) != EOF ) ;
}
This is a test of _fputc_nolock!!