[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH] Universally-unique gensyms
From: |
Mark H Weaver |
Subject: |
Re: [PATCH] Universally-unique gensyms |
Date: |
Wed, 18 Jan 2012 23:50:04 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.92 (gnu/linux) |
David Kastrup <address@hidden> writes:
> 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.
Hence the _thread-local_ gensym counters, which is what we're
discussing. Please read before you post.
Mark
- Re: [PATCH] Universally-unique gensyms, (continued)
- Re: [PATCH] Universally-unique gensyms, Andy Wingo, 2012/01/17
- Re: [PATCH] Universally-unique gensyms, Andy Wingo, 2012/01/17
- Re: [PATCH] Universally-unique gensyms, Mark H Weaver, 2012/01/18
- Re: [PATCH] Universally-unique gensyms, Mark H Weaver, 2012/01/18
- Re: [PATCH] Universally-unique gensyms, Ludovic Courtès, 2012/01/18
- Re: [PATCH] Universally-unique gensyms, Ludovic Courtès, 2012/01/18
- Re: [PATCH] Universally-unique gensyms, Andy Wingo, 2012/01/18
- Re: [PATCH] Universally-unique gensyms, Ludovic Courtès, 2012/01/18
- Re: [PATCH] Universally-unique gensyms, Mark H Weaver, 2012/01/18
- Re: [PATCH] Universally-unique gensyms, David Kastrup, 2012/01/18
- Re: [PATCH] Universally-unique gensyms,
Mark H Weaver <=
- Re: [PATCH] Universally-unique gensyms, David Kastrup, 2012/01/19
- Re: [PATCH] Universally-unique gensyms, Mark H Weaver, 2012/01/19
- Re: [PATCH] Universally-unique gensyms, Mark H Weaver, 2012/01/19
- Re: [PATCH] Universally-unique gensyms, Mark H Weaver, 2012/01/18
- Re: [PATCH] Universally-unique gensyms, Ludovic Courtès, 2012/01/19