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From: Doug Rabson <dfr@nlsystems.com>
To: Daniel Eischen <deischen@freebsd.org>
Date: Sun, 15 Aug 2004 14:58:38 +0100
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On Sunday 15 August 2004 14:47, Daniel Eischen wrote:
> On Sun, 15 Aug 2004, Doug Rabson wrote:
> > > Same error message here when starting neverball. If I map
> > > libpthread->libc_r it's working again.
> > >
> > > xawtv also stopped working. Fortunately setting -xvport manually
> > > did fix that.
> >
> > This might be because libGL calls libpthread's version of open()
> > before libpthread has initialised properly. This patch might fix it
> > - it fixes neverball's map compiler for me but I haven't actually
> > run neverball itself.
> >
> > Index: thr_open.c
> > ===================================================================
> > RCS file: /home/ncvs/src/lib/libpthread/thread/thr_open.c,v
> > retrieving revision 1.16
> > diff -u -r1.16 thr_open.c
> > --- thr_open.c	9 Dec 2003 02:20:56 -0000	1.16
> > +++ thr_open.c	15 Aug 2004 09:19:42 -0000
> > @@ -45,11 +45,15 @@
> >  int
> >  __open(const char *path, int flags,...)
> >  {
> > -	struct pthread *curthread = _get_curthread();
> > +	struct pthread *curthread;
> >  	int	ret;
> >  	int	mode = 0;
> >  	va_list	ap;
> >
> > +	if (_thr_initial == NULL)
> > +		_libpthread_init(NULL);
> > +
> > +	curthread = _get_curthread();
>
> I thought the C++ style constructor in thr_autoinit.c is supposed
> to take care of things like this?

The problem is that there is no particular ordering for constructors. In 
the case with neverball, the C++ constructor in libGL which initialises 
OpenGL ran first and quite reasonably tried to call open(2). This was 
intercepted by libpthread, which hadn't yet had its constructor called.