more cancellation work

[Ulrich Drepper]

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David Mosberger wrote:

> Have you considered using libunwind?  The API is portable, full
> implementation exists for ia64, and a partial one for x86.  See:
> 
> 	http://www.hpl.hp.com/research/linux/libunwind/
> 
> for some more info.  I'm not sure exactly what functionality you need,
> but if something is missing, let me know.

We have to use whatever gcc uses so libunwind is no option.

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Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
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