Re: libstdc++ / mt_allocator.cc when using gthreads

[Paolo Carlini]

Hi,
    All,
The enclosed testcases (very close to 
ext/mt_allocator/deallocate_global_thread-1.cc) exposes a pattern 
where the following sequence is called (when __gthread_active_p is 
enabled) :

    __gthread_key_create(&key,::_M_destroy_thread_key);
    __gthread_setspecific(key, (void*)_M_id);
    __gthread_key_delete(key);
    __gthread_setspecific(key, (void*)_M_id);
I didn't look into the issue in any detail - and I'm really glad that 
you are interested in improving mt_allocator - but I think that before 
going for quick patches, we should strive for fixing the underlying 
issue, eg prevent the above from occurring. After all, if you are right, 
the issue is very, very old, and nobody complained yet, thus better try 
very hard to fix it for real, finally. Do you have any plans for that?

Thanks,
Paolo.