[PATCH] elf: Release dl_load_lock before running dlopen constructors (BZ 15686)

[Florian Weimer]

* Alexander Pevzner:

> Florian,
>
>> I think if you arrange for suitable sleeps or barriers, you can get a
>> second dlopen for the same object on another thread to return while the
>> constructor is still executing on a first thread.  This was not possible
>> before.

> You mean the situation, when two threads dlopen-s the same DSO
> simultaneously, correct?

Yes, or for different DSOs if they happen to have a shared dependency.

Thanks,
Florian