Sujet : Re: Atomic caching of smart pointers
De : chris.m.thomasson.1 (at) *nospam* gmail.com (Chris M. Thomasson)
Groupes : comp.lang.c++Date : 16. Sep 2024, 21:12:01
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vca3eh$314se$3@dont-email.me>
References : 1 2
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On 9/16/2024 1:11 AM, Bonita Montero wrote:
Am 15.09.2024 um 20:54 schrieb Paavo Helde:
Caching single numeric values is easy. However, some cached data is large and accessed via a std::shared_ptr type refcounted smartpointers. Updating such a smartpointer in a thread-shared object is a bit more tricky. There is a std::atomic<std::shared_ptr> in C++20, but I wonder if I can do a bit better by providing my own implementation which uses CAS on a single pointer (instead of DCAS with additional data fields
or other trickery).
I think that's impossible because copying that pointer needs split
reference counting.
[...]
Well, it can use differential counting as well. Actually, this is making me think of one of my single word proxy collectors...
https://pastebin.com/raw/f71480694https://groups.google.com/g/lock-free/c/X3fuuXknQF0/m/6Fe5Ck43BwAJ
Atomic caching of smart pointers
Re: Atomic caching of smart pointers