Re: arm ldxr/stxr vs cas

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Sujet : Re: arm ldxr/stxr vs cas
De : mitchalsup (at) *nospam* aol.com (MitchAlsup1)
Groupes : comp.arch
Date : 08. Sep 2024, 01:59:51
Autres entêtes
Organisation : Rocksolid Light
Message-ID : <7ca6928a45e4cae89ba50a4623809d1c@www.novabbs.org>
References : 1 2 3 4 5 6 7 8 9 10 11 12
User-Agent : Rocksolid Light
On Sat, 7 Sep 2024 23:16:35 +0000, Chris M. Thomasson wrote:

On 9/7/2024 4:14 PM, Chris M. Thomasson wrote:
[...]
When I am using CAS I don't really expect it to fail willy nilly even if
the comparands are still the same. Weak vs Strong. Still irks me a bit.
;^)
>
There are algorithms out there, usually state machines that depend on
strong cas. When a CAS fails, it depends on it failing because the
comparands were actually different...
Leading to ABA failures::
Do you really want the following CAS to succeed ??
     LD    R19,[someMemoryValue]
..
interrupt delays program execution for 1 week
..
     CAS   R17,R19,[someMemoryLocation]
Given that the someMemoryLocation is accessible to other programs
while tis one is sleeping ??
Thus, it seems reasonable to fail a CAS when one cannot determine
if the memory location has been changed and changed back in the
mean time.

Date Sujet#  Auteur
2 Sep 24 * arm ldxr/stxr vs cas58jseigh
2 Sep 24 +* Re: arm ldxr/stxr vs cas4Chris M. Thomasson
2 Sep 24 i`* Re: arm ldxr/stxr vs cas3Chris M. Thomasson
2 Sep 24 i `* Re: arm ldxr/stxr vs cas2jseigh
2 Sep 24 i  `- Re: arm ldxr/stxr vs cas1Chris M. Thomasson
4 Sep 24 +* Re: arm ldxr/stxr vs cas50MitchAlsup1
5 Sep 24 i+* Re: arm ldxr/stxr vs cas3Chris M. Thomasson
5 Sep 24 ii`* Re: arm ldxr/stxr vs cas2MitchAlsup1
5 Sep 24 ii `- Re: arm ldxr/stxr vs cas1Chris M. Thomasson
5 Sep 24 i`* Re: arm ldxr/stxr vs cas46jseigh
5 Sep 24 i +- Re: arm ldxr/stxr vs cas1Anton Ertl
5 Sep 24 i `* Re: arm ldxr/stxr vs cas44MitchAlsup1
5 Sep 24 i  `* Re: arm ldxr/stxr vs cas43Chris M. Thomasson
5 Sep 24 i   `* Re: arm ldxr/stxr vs cas42jseigh
6 Sep 24 i    +- Re: arm ldxr/stxr vs cas1MitchAlsup1
6 Sep 24 i    +* Re: arm ldxr/stxr vs cas20Chris M. Thomasson
6 Sep 24 i    i`* Re: arm ldxr/stxr vs cas19MitchAlsup1
7 Sep 24 i    i `* Re: arm ldxr/stxr vs cas18jseigh
8 Sep 24 i    i  `* Re: arm ldxr/stxr vs cas17Chris M. Thomasson
8 Sep 24 i    i   `* Re: arm ldxr/stxr vs cas16Chris M. Thomasson
8 Sep 24 i    i    `* Re: arm ldxr/stxr vs cas15Chris M. Thomasson
8 Sep 24 i    i     `* Re: arm ldxr/stxr vs cas14MitchAlsup1
8 Sep 24 i    i      +* Re: arm ldxr/stxr vs cas4Chris M. Thomasson
8 Sep 24 i    i      i+- Re: arm ldxr/stxr vs cas1Chris M. Thomasson
8 Sep 24 i    i      i`* Re: arm ldxr/stxr vs cas2jseigh
8 Sep 24 i    i      i `- Re: arm ldxr/stxr vs cas1Chris M. Thomasson
8 Sep 24 i    i      `* Re: arm ldxr/stxr vs cas9Chris M. Thomasson
8 Sep 24 i    i       +* Re: arm ldxr/stxr vs cas6Michael S
8 Sep 24 i    i       i+- Re: arm ldxr/stxr vs cas1Chris M. Thomasson
8 Sep 24 i    i       i+- Re: arm ldxr/stxr vs cas1Chris M. Thomasson
9 Sep 24 i    i       i`* Re: arm ldxr/stxr vs cas3Michael S
9 Sep 24 i    i       i `* Re: arm ldxr/stxr vs cas2Michael S
9 Sep 24 i    i       i  `- Re: arm ldxr/stxr vs cas1Michael S
8 Sep 24 i    i       +- Re: arm ldxr/stxr vs cas1MitchAlsup1
8 Sep 24 i    i       `- Re: arm ldxr/stxr vs cas1Chris M. Thomasson
9 Sep 24 i    `* Re: arm ldxr/stxr vs cas20Terje Mathisen
9 Sep 24 i     +* Re: arm ldxr/stxr vs cas11jseigh
9 Sep 24 i     i+* Re: arm ldxr/stxr vs cas6Chris M. Thomasson
10 Sep 24 i     ii`* Re: arm ldxr/stxr vs cas5jseigh
10 Sep 24 i     ii `* Re: arm ldxr/stxr vs cas4Chris M. Thomasson
10 Sep 24 i     ii  `* Re: arm ldxr/stxr vs cas3jseigh
11 Sep 24 i     ii   `* Re: arm ldxr/stxr vs cas2Chris M. Thomasson
11 Sep 24 i     ii    `- Re: arm ldxr/stxr vs cas1Chris M. Thomasson
10 Sep 24 i     i`* Re: arm ldxr/stxr vs cas4Terje Mathisen
10 Sep 24 i     i `* Re: arm ldxr/stxr vs cas3jseigh
10 Sep 24 i     i  +- Re: arm ldxr/stxr vs cas1Chris M. Thomasson
10 Sep 24 i     i  `- Re: arm ldxr/stxr vs cas1Chris M. Thomasson
9 Sep 24 i     +- Re: arm ldxr/stxr vs cas1Chris M. Thomasson
11 Sep 24 i     `* Re: arm ldxr/stxr vs cas7Paul A. Clayton
11 Sep 24 i      +* Re: arm ldxr/stxr vs cas2Chris M. Thomasson
11 Sep 24 i      i`- Re: arm ldxr/stxr vs cas1Chris M. Thomasson
11 Sep 24 i      +* Re: arm ldxr/stxr vs cas2jseigh
11 Sep 24 i      i`- Re: arm ldxr/stxr vs cas1Chris M. Thomasson
11 Sep 24 i      `* Re: arm ldxr/stxr vs cas2Stefan Monnier
12 Sep 24 i       `- Re: arm ldxr/stxr vs cas1Chris M. Thomasson
9 Sep 24 `* Re: arm ldxr/stxr vs cas3jseigh
11 Sep 24  `* Re: arm ldxr/stxr vs cas2jseigh
11 Sep 24   `- Re: arm ldxr/stxr vs cas1Chris M. Thomasson

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