[Libunwind-devel] [PATCH] Re: dl_iterate_phdr deadlock in unw_step

[Jonathan Byrd]

On Mon, 22 Feb 2016 at 16:10:51 Arun Sharma wrote:
> The only known work around is to
> implement your own dl_iterate_phdr that doesn't call malloc by hooking
> into low level APIs that notify you every time a new shared object is
> loaded.

The attached patch adds the function 'unw_set_iterate_phdr_function' to 
the libunwind API, allowing a custom implementation of dl_iterate_phdr() 
to be hooked in. That implementation would need to maintain a local 
cache (or however else you wanted to manage it) to remove the need for 
taking the glibc loader lock.

Regards,
Jonathan Byrd
Senior Application Developer
Allinea Software Ltd.

0130_custom_dl_phdr_iterate_callback.patch
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