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From: jseigh <jseigh_es00@xemaps.com>
Newsgroups: comp.lang.c++
Subject: Re: Futexes ain't fast
Date: Fri, 30 Aug 2024 20:36:06 -0400
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On 8/30/24 15:45, Chris M. Thomasson wrote:
> On 8/30/2024 6:31 AM, jseigh wrote:
....
>>
>> They don't have to be fast, they just have to allow correct 
>> synchronization
>> and allow performant fast paths.  Can the api be improved for the latter?
>> Certainly yes.  It is an awkward api to use.
> 
> 100% agreed. Eventcounts are in the mix as well.
> 

You might take a look at folly's eventcount.  It (I think) only calls
futex wake if there are waiters, and only calls futex_wait if the
eventcount hasn't been incremented.  I did my own C version since I'm
working in C for now.

Joe Seigh