_putchar_nolock, _putwchar_nolock
The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.
The latest version of this topic can be found at _putchar_nolock, _putwchar_nolock.
Writes a character to stdout without locking the thread.
Syntax
int _putchar_nolock(
int c
);
wint_t _putwchar_nolock(
wchar_t c
);
Parameters
c
Character to be written.
Return Value
See putchar, putwchar.
Remarks
putchar_nolock and _putwchar_nolock are identical to the versions without the _nolock suffix 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 |
|---|---|---|---|
_puttchar_nolock |
_putchar_nolock |
_putchar_nolock |
_putwchar_nolock |
Requirements
| Routine | Required header |
|---|---|
_putchar_nolock |
<stdio.h> |
_putwchar_nolock |
<stdio.h> or <wchar.h> |
The console is not supported in Windows 8.x Store 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 Windows 8.x Store apps. For more compatibility information, see Compatibility.
Libraries
All versions of the C run-time libraries.
Example
// crt_putchar_nolock.c
/* This program uses putchar to write buffer
* to stdout. 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;
for( p = buffer; (ch != EOF) && (*p != '\0'); p++ )
ch = _putchar_nolock( *p );
}
Output
This is the line of output