Re: SEGFAULT with a multithread foundation(base) tools samples

[Thierry DELHAISE]

Le 9 janv. 05, à 18:29, Fred Kiefer a écrit :

> Thierry DELHAISE wrote:
> > I've wrote a sample Foundation "tools" to test threads communications 
> > : this tools work on OS/X (don't segfault).
> > it segfault under a Linux machine :
> > - Kernel 2.6.8-1-686-smp (Debian 3.1) : it's really an SMP machine 
> > (2x PIII 800).
> > - gcc -v
> > Reading specs from /usr/lib/gcc-lib/i486-linux/3.3.5/specs
> > Configured with: ../src/configure -v 
> > --enable-languages=c,c++,java,f77,pascal,objc,ada,treelang 
> > --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info 
> > --with-gxx-include-dir=/usr/include/c++/3.3 --enable-shared 
> > --with-system-zlib --enable-nls --without-included-gettext 
> > --enable-__cxa_atexit --enable-clocale=gnu --enable-debug 
> > --enable-java-gc=boehm --enable-java-awt=xlib --enable-objc-gc 
> > i486-linux
> > Thread model: posix
> > gcc version 3.3.5 (Debian 1:3.3.5-5)
> > gnustep-base (Foundation) is the last debian package : 1.10.1-2
> > -
> > My original dev platform is an OS/X 10.3.7 with Apple Developper 
> > tools :
> > gcc -v
> > Reading specs from /usr/libexec/gcc/darwin/ppc/3.3/specs
> > Thread model: posix
> > gcc version 3.3 20030304 (Apple Computer, Inc. build 1666)
> > I join a gz of the GNUstep project I've made : I've modify no source 
> > code to build this sample : just add a GNUmakefile...
>
> I just tried your code on a single processor GNUstep machine and it 
> works there, so you may be right that there is a problem with thread 
> safety in GNUstep. No idea how I should investigate this further as I 
> cannot reproduce this.
> Is your Apple machine also a multiprocessor one?

Yes it is a PowerMac G5 Bi Processor 2Ghz under 10.3.7 and I use for 
sure the Apple developper tools provide for 10.3.

Since some discussions on irc #gnustep this afternoon, I will follow 
advice of aeruder (may be it's you ? ;-) ) and will build my GNUstep 
Foundation from source with debug symbols and will post the result of 
the segfault :

in gdb with the libFoundation provide by debian from package 
libFoundation_d 1.10.1-2, it seems it segfault when the second thread 
reach [pool release]; at the end of class method used as the selector 
parameter of [NSThread] : connectWithPorts;

Just an idea : does the use of boem_gc (--enable-objc-gc) in the 
standard compiler tools chain provide by debian for gcc 3.3.5 in objc 
language could be the source of my problem ?


> Cheers
> Fred

THX

Thierry (befree)