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Re: C++20 futex with heavy contention slower than mutex

From "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com>
Newsgroups comp.lang.c++
Subject Re: C++20 futex with heavy contention slower than mutex
Date 2024-04-13 21:26 -0700
Organization A noiseless patient Spider
Message-ID <uvflt5$3fa23$1@dont-email.me> (permalink)
References (13 earlier) <uufr1r$2v8qo$1@raubtier-asyl.eternal-september.org> <uvc8c4$2ik6i$1@dont-email.me> <uvclf0$2l4bk$1@raubtier-asyl.eternal-september.org> <uvem9v$35hth$1@dont-email.me> <uvflfv$3f7ep$1@raubtier-asyl.eternal-september.org>

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On 4/13/2024 9:19 PM, Bonita Montero wrote:
> Am 13.04.2024 um 21:26 schrieb Chris M. Thomasson:
> 
>> On 4/12/2024 6:00 PM, Bonita Montero wrote:
> 
>>> There's no slow path with futexes since you've to notify _always_.
> 
>> Huh? Nope! Where did you get that idea from? calling notify is a slow 
>> path, and calling wait is a slow path.
> 
> Unlocking a futex always involves a notify since the notify doesn't
> depend on a state like a wait().
> 
>>
>>> And 1.7ns isn't slow.
>>
>> You do not want to _always_ call notify and/or wait when you do not 
>> have to.
> 
> You don't unterstand futexes. Show me your mutex basing on C++20 futexes.

Did you read it? using windwos futexes:

https://groups.google.com/g/comp.lang.c++/c/1MZvhswJ6DQ/m/qyaYH-i0CgAJ

Notice how it does not unlock all the time?

I can port it to c++20.

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C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-03-29 14:14 +0100
  Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-03-29 15:28 -0700
    Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-03-29 15:30 -0700
      Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-03-29 16:29 -0700
        Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-03-29 19:46 -0700
        Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-03-30 09:25 +0100
          Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-03-30 11:51 -0700
            Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-03-30 12:02 -0700
            Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-03-30 21:18 +0100
              Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-03-31 13:11 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-01 08:32 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-03-31 23:40 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-01 10:57 +0200
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-01 11:01 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-01 12:27 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-02 04:37 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-12 14:16 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-13 03:00 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-13 12:26 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-14 06:19 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-13 21:26 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-14 06:30 +0200
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-14 06:34 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-13 22:21 -0700
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-13 22:21 -0700
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-13 22:22 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-14 07:30 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-13 22:32 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-14 07:36 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-13 22:42 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-14 07:46 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-13 22:48 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-14 11:25 +0200
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-14 15:12 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-14 12:02 -0700
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-14 12:06 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-14 22:57 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-14 20:23 -0700
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-14 20:26 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-15 06:15 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-14 22:03 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-15 08:20 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-15 12:08 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-16 06:32 +0200
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-16 11:31 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-16 14:07 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-17 10:24 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-17 11:48 -0700
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-17 11:52 -0700
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-16 14:14 -0700
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-18 15:12 +0200
                Re: C++20 futex with heavy contention slower than mutex Richard Damon <richard@damon-family.org> - 2024-04-18 22:03 -0400
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-19 06:18 +0200
                Re: C++20 futex with heavy contention slower than mutex scott@slp53.sl.home (Scott Lurndal) - 2024-04-19 13:41 +0000
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-19 15:44 +0200
                Re: C++20 futex with heavy contention slower than mutex scott@slp53.sl.home (Scott Lurndal) - 2024-04-19 14:48 +0000
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-19 17:32 +0200
                Re: C++20 futex with heavy contention slower than mutex scott@slp53.sl.home (Scott Lurndal) - 2024-04-19 18:27 +0000
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-20 04:48 +0200
                Re: C++20 futex with heavy contention slower than mutex scott@slp53.sl.home (Scott Lurndal) - 2024-04-20 15:16 +0000
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-20 17:36 +0200
                Re: C++20 futex with heavy contention slower than mutex Richard Damon <richard@damon-family.org> - 2024-04-19 23:00 -0400
                Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-04-20 06:11 +0200
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-14 12:10 -0700
                Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-13 22:46 -0700
            Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-03-31 22:01 -0700
              Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-03-31 22:02 -0700
    Re: C++20 futex with heavy contention slower than mutex Bonita Montero <Bonita.Montero@gmail.com> - 2024-03-30 05:18 +0100
  Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-03-30 12:00 -0700
  Re: C++20 futex with heavy contention slower than mutex Michael S <already5chosen@yahoo.com> - 2024-04-01 12:18 +0300
    Re: C++20 futex with heavy contention slower than mutex "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-04-04 19:56 -0700

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