I guess technically it's now 2026, but I'm not changing the date on this one https://pvk.ca/Blog/2025/12/30/six-versions-accessing/
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Joe Seigh
@jwseigh
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@tobinbaker @pkhuong
Deferred reclamation is sort of meant for short read access and not frequently doing writes.
Reference counting has the least latency for reclamation but has a lot of overhead.
RCU w/ restartable sequences could be a thing but I don't know where that went. I had a discussion with
@paulmckrcu about implementing it w/ signals but it turned out not to be feasible. This was back herehttps://groups.google.com/g/comp.os.linux.development.system/c/q9W9svf_DgY/m/3-RYj32I1Q4J .
Deferred reclamation is sort of meant for short read access and not frequently doing writes.
Reference counting has the least latency for reclamation but has a lot of overhead.
RCU w/ restartable sequences could be a thing but I don't know where that went. I had a discussion with
@paulmckrcu about implementing it w/ signals but it turned out not to be feasible. This was back herehttps://groups.google.com/g/comp.os.linux.development.system/c/q9W9svf_DgY/m/3-RYj32I1Q4J .
@pkhuong @tobinbaker
#hazardpointers w/o the membar was done as POC around this time
https://groups.google.com/g/comp.programming.threads/c/XU6BtGNSkF0/m/AmWXvkGn3DAJ?pli=1
EBR wait-free w/o membar implementation (smrproxy) in here https://github.com/jseigh/proxies
Also there are about 2 or more ways to do #waitfree hazard pointers. See postings in https://jseigh.wordpress.com/
This #github panic where everyone is running around and screaming is almost as entertaining as when Jen broke the internet.
A gold plated prop sledge hammer would have been more apropos but then there would have been the inevitable tweet "WORST PUTTER EVER!!!" so there's that.
@deutrino @bruces Yes, daylight savings. One of my favorite time zones for testing was Canada/NewFoundland. They changed the change over times but way back ...
https://www.timeanddate.com/time/change/canada/newfoundland-and-labrador?year=2010
https://www.timeanddate.com/time/change/canada/newfoundland-and-labrador?year=2010
@bruces It's possibly the one thing, other than #concurrency, that programmers are worse at. Even supposedly smart ones.
@paulmckrcu Yes, very tricky. Apparently I mentioned you could do it with a MVC instruction 20 years ago, https://groups.google.com/g/comp.programming.threads/c/XU6BtGNSkF0/m/AmWXvkGn3DAJ, but I have absolutely no memory of that. So I "reinvented" it a short while back, then convinced myself it wouldn't work, and then came across that other article.
@paulmckrcu I was making assumptions about how membarrier was implemented. If it was using RCU it would probably work, not so much for the other implementations.
Anyway, I have a wait-free epoch based reclamation implementation that is easier to work with and has the ability to control reclaim granularity.