[PATCH] libdw: add thread-safety to dwarf_getabbrev()
Sat Oct 26 12:06:00 GMT 2019
On Sat, 2019-10-26 at 12:54 +0200, Florian Weimer wrote:
> * Jonathon Anderson:
> > Just finished some modifications to the patch series, git request-pull
> > output below. This rebases onto the latest master and does a little
> > diff cleaning, the major change is that I swapped out the memory
> > management to use the pthread_key_* alternative mentioned before.
> This use of pthread_key_* is rather unusual. In particular, there are
> only 1024 keys supported for the entire process, so it limits the
> number of Dwarf * objects that can be created by one process, even if
> it does not use any threads.
O, I didn't know that there was such a low limit on pthread_keys. That
is indeed a bit of a problem, especially with split-dwarf where
basically every CU could be its own Dwarf object (from a .dwo file).
That would easily exceed such a low limit.
I'll see if I can create a case where that is a problem. Then we can
see how to adjust things to use less pthread_keys. Is there a different
pattern we can use?
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