Re: [PATCH] Universally-unique gensyms

[David Kastrup]

Mark H Weaver <address@hidden> writes:

> Andy Wingo <address@hidden> 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.

-- 
David Kastrup