atomic Xprintf

[Brian Ford]

This Cygwin bug:

http://www.cygwin.com/ml/cygwin/2004-05/msg00765.html

appears to be caused by these changes:

2003-08-22  Jeff Johnston  <jjohnstn at redhat dot com>

        * libc/stdio/vasprintf.c: Ditto.  Also call _vfprintf_r directly.
        * libc/stdio/vsnprintf.c: Ditto.
        * libc/stdio/vsprintf.c: Ditto.
        * libc/stdio/snprintf.c: Call _vfprintf_r directly.
        * libc/stdio/sprintf.c: Ditto.
        * libc/stdio/vprintf.c: Ditto.  Also add _REENT_ONLY check.

Calling _vfprintf_r directly avoids the f[lock|unlock]file calls that
would happen if just _vfprintf were called.

I don't understand the reasoning for this change.  Could someone please
explain?  Thanks.

-- 
Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained pilot...