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Re: smrproxy v2

From jseigh <jseigh_es00@xemaps.com>
Newsgroups comp.lang.c++
Subject Re: smrproxy v2
Date 2024-10-28 07:45 -0400
Organization A noiseless patient Spider
Message-ID <vfntgb$vete$1@dont-email.me> (permalink)
References (7 earlier) <vfm4iq$ill4$1@dont-email.me> <vfmesn$k6mn$1@dont-email.me> <vfmf21$kavl$1@dont-email.me> <vfmm9a$lob3$1@dont-email.me> <vfn2di$r8ca$1@dont-email.me>

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On 10/28/24 00:02, Chris M. Thomasson wrote:
> On 10/27/2024 5:35 PM, jseigh wrote:
>> On 10/27/24 18:32, Chris M. Thomasson wrote:

>>
>> The membar version?  That's a store/load membar so it is expensive.
> 
> I was wondering in your c++ version if you had to use any seq_cst 
> barriers. I think acquire/release should be good enough. Now, when I say 
> C++, I mean pure C++, no calls to FlushProcessWriteBuffers and things 
> like that.
> 
> I take it that your pure C++ version has no atomic RMW, right? Just 
> loads and stores?

While a lock action has acquire memory order semantics, if the
implementation has internal stores, you have to those stores
are complete before any access from the critical section.
So you may need a store/load memory barrier.

For cmpxchg, it has full cst_seq.  For other rmw atomics I don't
know.  I have to ask on c.a.  I think some data dependency and/or
control dependency might factor in.

Joe Seigh

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smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-10-17 08:10 -0400
  Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-17 13:10 -0700
    Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-10-17 17:08 -0400
      Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-17 16:40 -0700
        Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-17 17:16 -0700
          Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-17 17:24 -0700
        Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-10-18 08:07 -0400
          Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-25 15:00 -0700
            Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-10-25 18:56 -0400
              Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-27 12:33 -0700
                Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-10-27 18:29 -0400
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-27 15:32 -0700
                Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-10-27 20:35 -0400
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-27 21:02 -0700
                Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-10-28 07:45 -0400
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-28 14:57 -0700
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-28 15:09 -0700
                Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-10-28 21:17 -0400
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-28 21:35 -0700
                Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-10-29 07:23 -0400
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-29 14:51 -0700
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-28 21:38 -0700
                Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-10-29 07:27 -0400
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-29 14:56 -0700
                Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-10-30 12:36 -0400
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-01 12:20 -0700
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-28 21:41 -0700
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-29 15:05 -0700
                Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-10-30 12:39 -0400
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-03 21:14 -0800
                Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-11-04 07:46 -0500
                Re: smrproxy v2 Muttley@DastartdlyHQ.org - 2024-11-04 14:09 +0000
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-04 12:42 -0800
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-09 13:51 -0800
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-12-12 00:43 -0800
                Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-12-12 07:29 -0500
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-12-12 13:55 -0800
                Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-12-12 19:48 -0500
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-12-25 20:36 -0800
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-27 21:08 -0700
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-27 21:09 -0700
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-27 21:13 -0700
  Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-28 22:02 -0700
    Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-29 23:40 -0700
    Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-29 23:42 -0700
      Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-29 23:53 -0700
  Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-29 23:54 -0700
    Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-10-30 12:43 -0400
  Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-02 13:50 -0700
  Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-11-21 15:17 -0500
    Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-11-23 11:10 -0500
      Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-23 13:31 -0800
        Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-11-23 17:12 -0500
          Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-23 17:46 -0800
      Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-11-24 15:14 -0500
        Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-24 15:19 -0800
          Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-11-24 19:09 -0500
            Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-24 16:37 -0800
              Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-24 16:48 -0800
            Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-24 16:47 -0800
              Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-11-25 06:31 -0500
                Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-11-25 14:12 -0800
        Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-11-27 10:29 -0500
          Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-12-09 13:34 -0500
            Re: smrproxy v2 jseigh <jseigh_es00@xemaps.com> - 2024-12-11 07:13 -0500
              Re: smrproxy v2 "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-12-11 16:22 -0800

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