Re: lock-free swsr fifo vector queue in stl

From:
"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>
Newsgroups:
microsoft.public.vc.mfc
Date:
Thu, 05 Apr 2007 04:37:04 -0400
Message-ID:
<uXmSQ21dHHA.4004@TK2MSFTNGP06.phx.gbl>
Marcus wrote:

WaitForSingleObject is a lock. Nothing lock-free about that!


yes, hehe, that's a lock, but as i was trying to explain to Joe, I
wasn't intending it to be used to lock the vector, but rather as a
thread sleeper. perhaps there's a better way of doing that, i don't
know and didn't research how to do it via threading. this all seems to
be moot though as i think using an stl vector for this might not be
the best approach.

i think you guys have a basic concept of what i'm trying to do though
(efficient swsr fifo msg queue), so any suggestions or alternative
solutions would be much appreciated.

best regards guys and thanks for your comments,
marcus


A swsr FIFO is fairly easy to design if you can stand the fixed size of
a circular buffer. Try a google on "lock free circular buffer". In this
age of multiprocessors you should use the InterlockedXxxx functions to
increment and compare the two indexes. Not totally lock free either,
but necessary for "memory fence" reasons.

--
Scott McPhillips [VC++ MVP]

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