Re: [Qemu-devel] why does qemu i386 userspace emulation crashes when pthread used?

[Yale Zhang <yzhang1985@gmail.com>]

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I have found the problem and fix. NEW_STACK_SIZE for clone()  should be
increased from the default 16384 (x86_64) to  256 KiB.

On Tue, Apr 19, 2011 at 6:33 PM, Yale Zhang <yzhang1985@gmail.com> wrote:

> Hi. I'm want to run some pthread programs using qemu userspace emulation
> (target=i386, host=x86_64,arm), but see NPTL support isn't supported for the
> i386 target. I have applied a patch from here
> http://patchwork.ozlabs.org/patch/45206/ and used it to run a simple
> pthread fork, join program. The program is able to launch multiple threads,
> but the 1st thread that exits causes the program to crash inside the pthread
> library.
>
> What are the reasons NPTL isn't supported for i386 and was it ever
> supported in the past? I even wrote another simple program that does the
> equivalent, but with using fork(), waitpid() instead of pthread_create(),
> pthread_join(), and it works correctly. This seems to suggest thread local
> storage wasn't implemented correctly?
>
> Thanks,
> Yale
>
>

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