Re: portable proxy collector test...

On 12/6/2024 11:55 AM, Brett wrote:

Chris M. Thomasson <chris.m.thomasson.1@gmail.com> wrote:

I am wondering if anybody can try to compile and run this C++11 code of
mine for a portable word-based proxy collector, a sort of poor mans RCU,
on an ARM based system? I don't have access to one. I am interested in
the resulting output.

 https://godbolt.org
 

https://pastebin.com/raw/CYZ78gVj
(raw text link, no ads... :^)

[...]
It seems that all of the atomics are LDREX/STREX wrt fetch_add/sub . Even with relaxed memory order. Are the LDREX/STREX similar to the LOCK prefix on an x86/64?
https://godbolt.org/z/EPGYWve71
It has loops for this in the ASM code. Adding a loop in there can change things from wait-free to lock-free. Humm...
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#include <atomic>
int
main()
{
     {
         std::atomic<unsigned long> g_state_0(123);
         g_state_0.fetch_add(1, std::memory_order_relaxed);
     }
     return 0;
}
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