[libdispatch-dev] [PATCH] libdispatch-r197_v1

[Mark Heily]

On 06/09/2011 01:56 AM, Paolo Bonzini wrote:
> On 06/09/2011 05:27 AM, Mark Heily wrote:
>>
>> Description: multiple fixes for libdispatch r197
>> * Workaround a link-time error by avoiding the use of
>> __private_extern__ on GNU/Linux.
>
> Have you reported this? Does it happen with both the LLVM internal
> assembler/linker (I'm a little rusty, I don't remember if the LLVM
> linker exists for ELF or is only for Mac OS) and GNU binutils? Can you
> send (here or privately) the output of "make >error.log 2>&1" with the
> failure?
>

I haven't reported the problem. It doesn't happen with the LLVM linker, 
however llvm-ld cannot generate shared libraries on Linux; it can only 
produce static libraries. I've attached the error log as you requested.

>> * Workaround a pthread_exit() bug on Linux that causes the process to
>> become a zombie.
>
> Can you detail this more? I remember seeing something on the list, but I
> am not sure.
>

When the main thread calls pthread_exit() in Linux, the process becomes a 
zombie. My memory is fuzzy, but I seem to remember having problems sending 
SIGSTOP to the process, and was also unable to attach a debugger to the 
process. Here is an LKML thread that discusses the problem and references a 
glibc bug report:

    http://kerneltrap.org/mailarchive/linux-kernel/2009/2/1/4404553

I checked kernel/exit.c in Linux 2.3.35, and it appears the kernel patch to 
fix the issue has not been applied.

Regards,

  - Mark


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