On Mon, Feb 10, 2003 at 09:36:53PM -0500, Igor Pechtchanski wrote: >On Mon, 10 Feb 2003, Ajay Nerurkar wrote: > >> Is Cygwin's gethostbyname thread-safe? From a web search I got the >> impression that it wasn't and also that Cygwin does not have its >> reentrant version gethostbyname_r. So, what does one do? >> >> Ajay > >Ajay, > >Looking at the code (src/winsup/cygwin/net.cc), > >964:#ifdef _MT_SAFE >965:#define hostent_buf _reent_winsup ()->_hostent_buf >966:#else >967:static struct hostent *hostent_buf = NULL; >968:#endif >969: >970:/* exported as gethostbyname: standards? */ >971:extern "C" struct hostent * >972:cygwin_gethostbyname (const char *name) > >you can see that there is a provision for reentrancy. However, >src/winsup/cygwin/acconfig.h #undef's _MT_SAFE. OpenGroup's specification >(<http://www.opengroup.org/onlinepubs/007904975/functions/gethostbyaddr.html>) >says that "The gethostbyname() function need not be reentrant." >See <http://wcug.wwu.edu/lists/ipng/199710/msg00002.html> for a good >discussion of gethostbyname() thread-safety issues.
_MT_SAFE is always set to 1 in config.h unless the dll is built with --disable-threadsafe. I don't know that this option even works, though. So gethostbyname should be threadsafe. cgf -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
