August 2003 - openSUSE Programming - openSUSE Mailing Lists

assertin in bfd fail
by Cincai Patron 16 Aug '03

16 Aug '03

When I debugging a c++ program in gdb, I encountered lots of these errors: BFD: BFD 2.13.90 20020903 assertion fail libbfd.c:1132 What does the error mean? -- -- Verdi March --

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context
by Verdi March 16 Aug '03

16 Aug '03

Hi, any good books/online sources to learn about sysV context (createcontext, swapcontext, etc)? TIA. Verdi -- COMPUTERBILD 15/03: Premium-e-mail-Dienste im Test -------------------------------------------------- 1. GMX TopMail - Platz 1 und Testsieger! 2. GMX ProMail - Platz 2 und Preis-Qualitätssieger! 3. Arcor - 4. web.de - 5. T-Online - 6. freenet.de - 7. daybyday - 8. e-Post

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Re: [suse-programming-e] Perl Debugging Question
by Marius Roets 12 Aug '03

12 Aug '03

Yes, that's what I did, and it works. The only annoyance is that it breaks twice in every method call, even if the attribute is not changed. The way I understand it, when the method is entered, $self in not defined, thus $self->{attribute} is not defined. The debugger breaks, because it changed from some value to undefined. Now the method does $self = shift; and suddenly $self is defined again, and also $self->{attribute}, so the debugger breaks again. Not a huge problem, but pretty annoying, especially if you want to step over most method calls. Marius Roets Senior Support and Development Analyst Power Exchange Eskom Transmission South Africa Tel: +27 11 871 3749 Fax: +27 11 871 3304 Pax: 8181 3749 Cell: +27 83 626 1727 >>> jbudd <jbudd(a)iserv.net> 08/11/03 16:42 PM >>> On Monday 11 August 2003 10:04, Marius Roets wrote: > Never mind, it turns out it was obvious. I was making typo. > BTW Does anyone have a suggestion, on how to put a watch on a class > attribute (hash element) that does not break twice for every method called? this is how i would do it. warn ('$self->{attribute} == ' . $self->{'attribute'}); joe budd -- To unsubscribe, email: suse-programming-e-unsubscribe(a)suse.com For additional commands, email: suse-programming-e-help(a)suse.com Archives can be found at: http://lists.suse.com/archive/suse-programming-e

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Anyone got thread local storage to work with SuSE 8.2?
by Marshall, Simon 11 Aug '03

11 Aug '03

Hi all, I've been trying to use the __thread attribute with gcc (gcc-3.3.1) and SuSE 8.2 (Linux 2.4.20-4GB) without any success. Has anybody out there managed to get it working? Please let me know! The GCC manual says TLS requires support from ld, ld.so, libc.so and libpthread.so, but I cannot find out exactly what I need, whether I have it and how I get it. I have a function defined in file __thread.cpp as: #include <stdio.h> #include <pthread.h> __thread pthread_t p = 0; extern "C" void *foo (void *) { int j = 0; p = pthread_self(); printf ("thread %d starts\n", p); fflush (stdout); for (int i = 0; i < 10 * 1000 * 1000; i++) j += i; printf ("thread %d ends\n", p); fflush (stdout); return NULL; } I build a shared library like this: gcc -g -D_REENTRANT -fpic -W -c __thread.cpp -o __thread.o # no need for -ftls-model= here gcc -shared __thread.o -o lib__thread.so I then link the library to a file containing main() that creates several threads running function foo() like this: gcc -g -D_REENTRANT -fpic -W -L. -l__thread -lpthread __threadmain.cpp ./lib__thread.so: undefined reference to `___tls_get_addr' collect2: ld returned 1 exit status Does this mean I don't have the necessary support for TLS? What do I need to get support for it? If I build without the __thread attribute it works (except that p has a single value of course). I also get: % ldd ./a.out libpthread.so.0 => /lib/libpthread.so.0 (0x40022000) libc.so.6 => /lib/libc.so.6 (0x40073000) /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000) Please can anyone shed any light on this or show me where to look? Thanks, Simon. NB: FWIW, if I just build an executable from a file with both main() and foo(), i.e., not a shared library, then the build is OK but SEGVs at the call to pthread_self() like this: % gcc -g -D_REENTRANT -fpic -lpthread thread__.cpp % ./a.out Segmentation fault % ldd ./a.out # Get this!? not a dynamic executable % gdb ./a.out (gdb) run Starting program: /home/marshals/tmp/a.out [New Thread 16384 (LWP 9493)] [New Thread 32769 (LWP 9494)] [New Thread 16386 (LWP 9495)] [New Thread 32771 (LWP 9496)] [New Thread 49156 (LWP 9497)] [New Thread 65541 (LWP 9498)] BFD: BFD 2.13.90 20020903 assertion fail libbfd.c:1132 [repeats] Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 65541 (LWP 9498)] 0x08048635 in foo () at thread__.cpp:12 12 p = pthread_self();

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Re: [suse-programming-e] Perl Debugging Question
by Marius Roets 11 Aug '03

11 Aug '03

Never mind, it turns out it was obvious. I was making typo. BTW Does anyone have a suggestion, on how to put a watch on a class attribute (hash element) that does not break twice for every method called? Regards Marius Marius Roets Senior Support and Development Analyst Power Exchange Eskom Transmission South Africa Tel: +27 11 871 3749 Fax: +27 11 871 3304 Pax: 8181 3749 Cell: +27 83 626 1727 >>> "Marius Roets" <Marius.Roets(a)eskom.co.za> 08/11/03 15:57 PM >>> Can anyone help me with the syntax for setting a watch in the Perl debugger. The documentation on this says it should be obvious how to do this, but alas, I don't seem to be able to get it right. Regards Marius -- To unsubscribe, email: suse-programming-e-unsubscribe(a)suse.com For additional commands, email: suse-programming-e-help(a)suse.com Archives can be found at: http://lists.suse.com/archive/suse-programming-e

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Perl Debugging Question
by Marius Roets 11 Aug '03

11 Aug '03

Can anyone help me with the syntax for setting a watch in the Perl debugger. The documentation on this says it should be obvious how to do this, but alas, I don't seem to be able to get it right. Regards Marius

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C++ man pages
by Filippos Papadopoulos 08 Aug '03

08 Aug '03

Well i am a bit new to C++ so my main problem is about STL and its documentation. Aren't there man pages about C++ STL classes ? (like in C)... If not, why ?

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Re: [suse-programming-e] Perl Question regarding file handles
by Marius Roets 05 Aug '03

05 Aug '03

That did the trick. Why do we seem to able to solve complicated problems, and then get stuck at the simple ones. Thanks. >>> jbudd <jbudd(a)iserv.net> 04/08/2003 19:21:34 >>> On Monday 04 August 2003 07:11, Marius Roets wrote: Ok this time to the list. Try something like this. $handle = $self->{'handle'}; if (open($handle, $self->{'path'})) { $data = <$handle>; ... close($handle); } -- To unsubscribe, email: suse-programming-e-unsubscribe(a)suse.com For additional commands, email: suse-programming-e-help(a)suse.com Archives can be found at: http://lists.suse.com/archive/suse-programming-e

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Perl Question regarding file handles
by Marius Roets 04 Aug '03

04 Aug '03

Hi Everybody, I created a Perl class, and one of the attributes is a file handle. I used the standard FileHandle class to create the file handle. Opening and writing to the file handle is no problem, but reading from it has a bit of a syntactic problem. Example: $line = <$this->{FH}> ### Generates a syntax error. The problem is that interpreter sees the first > as the end of the operator. I have tried $line = <{$this->{FH}}> $line = <${this->{FH}}> with no success. Any ideas on how I can overcome this problem. Thanks Marius Roets

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