Re: [uml-devel] Re: pthreads?

[Jan Hudec <bulb@ucw.cz>]

On Thu, Oct 02, 2003 at 16:28:45 +0200, Geert Uytterhoeven wrote:
> On Thu, 2 Oct 2003, Jan Hudec wrote:
> 
> > On Thu, Oct 02, 2003 at 12:03:10 +0200, Geert Uytterhoeven wrote:
> > > Hence _your_ simple application doesn't need libpthread.
> > 
> > Hence NEITHER OF GTK, GDK, GLIB, GMODULE, GOBJECT, PANGO, ATK, X11 NEED
> > libpthread!
> > 
> > > | gcc -Wl,-T,arch/um/uml.lds.s -static -Wl,--wrap,malloc -Wl,--wrap,free -Wl, --wrap,calloc  -o linux arch/um/main.o vmlinux -L/usr/lib -lutil -L/usr/X11R6/li b -lgtk -lgdk -lX11 -lXi -lXext -lglib -lgmodule -ldl -lm -lgthread
> > 
> > However if you link with gthread, you need pthread.
> > So: a) Please don't blame it on X11.
> 
> What about this:
> 
> | /usr/X11R6/lib/libX11.a(XlibInt.o)(.text+0x74c): In function `_XEventsQueued':
> | : undefined reference to `pthread_equal'
> | /usr/X11R6/lib/libX11.a(XlibInt.o)(.text+0x766): In function `_XEventsQueued':
> | : undefined reference to `pthread_equal'
> | /usr/X11R6/lib/libX11.a(XlibInt.o)(.text+0x781): In function `_XEventsQueued':
> | : undefined reference to `pthread_equal'
> | /usr/X11R6/lib/libX11.a(XlibInt.o)(.text+0x79a): In function `_XEventsQueued':
> | : undefined reference to `pthread_equal'
> | /usr/X11R6/lib/libX11.a(XlibInt.o)(.text+0x7b7): In function `_XEventsQueued':
> | : undefined reference to `pthread_equal'
> | /usr/X11R6/lib/libX11.a(XlibInt.o)(.text+0xafc): more undefined references to `pthread_equal' follow
> 
> Some investigation shows that libX11 needs pthread_equal() when linked
> statically, while it doesn't need it when linked dynamically.

Ugh. That sounds strange, that a library needs something only if linked
staticaly. However, it really looks like static libX11 causing trouble.

> >     b) Don't link against gthread unless you need them.
> >     b.1) If you only call Gtk stuff in one thread, you don't need them.
> >     b.2) If you call Gtk stuff from more than one thread, you can still
> > 	 provide gthread library with custom locking and get rid of
> > 	 pthread.
> 
> I tried that, providing my own implementation for pthread_equal().
> However, it hangs during gtk_init(). Since this doesn't happen within my
> stand-alone GTK test app, it must be some interaction between UML and GTK...

It would be interesting to know where it actualy hangs.

-------------------------------------------------------------------------------
						 Jan 'Bulb' Hudec <bulb@ucw.cz>


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