David Kastrup <d...@gnu.org> writes:
> Mark H Weaver <m...@netris.org> writes:
>
>> Andy Wingo <wi...@pobox.com> writes:
>>
>>> Sorry for asking a stupid question, but why is it that we want the
>>> gensym counter to be thread-local? Just to avoid the mutex? TBH I
>>> don't think it's that big of a point of contention. This risks
>>> devolution into bike-shed-landia tho...
>>
>> It's a reasonable question. I don't feel strongly about it, but I
>> prefer lock-free programming where practical, and in this case there's
>> really no need for coordination between threads. Indeed, these UUIDs
>> are already designed to avoid collisions between multiple _sessions_
>> without coordination. So why bother with the lock?
>
> To avoid both threads reading the same seed value before generating the
> same number? I have not looked at the code, but that could be a reason
> for serializing.
Hence the _thread-local_ gensym counters, which is what we're
discussing. Please read before you post.
Mark
