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Groups > comp.lang.c++ > #120457
| From | "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: a try_lock pattern... |
| Date | 2024-09-29 12:55 -0700 |
| Organization | A noiseless patient Spider |
| Message-ID | <vdcbc6$1s42m$1@dont-email.me> (permalink) |
| References | <vd8an7$15ff9$1@dont-email.me> <vd8cmd$159kt$3@dont-email.me> <vd9kph$1c8ti$1@dont-email.me> <ODgKO.253710$FzW1.65557@fx14.iad> |
On 9/29/2024 11:03 AM, Scott Lurndal wrote:
> "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> writes:
>> On 9/28/2024 12:53 AM, Paavo Helde wrote:
>
>> Nice! Thanks for taking the time to give it a go Paavo. Basically, the
>> main "pattern" is in the ct_shared::work_a_lock() function:
>> _____________________
>> void work_a_lock()
>> {
>> while (! m_lock_a.try_lock())
>> {
>> if (! work_b_try(1))
>> {
>> m_lock_a.lock();
>> break;
>> }
>> }
>> }
>> _____________________
>>
>
> Seems a waste. Just fire up two threads one for b work
> and one for a work. Let the OS manage the CPUs.
Creating only two threads, one for work_a and one for work_b would mean
that I would not even have to use any mutexes because it would be
embarrassingly parallel.
Humm... I am not quite sure if its a total waste or not. The idea is to
try to to do some work_b instead of potentially waiting in the kernel
for work_a while its in a contended state. Actually, for some reason, it
kind of reminds me of work stealing. A contended work_a can try to steal
some of work_b's workload. Humm... Once work_a is contended, what should
the thread do in the mean time?
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a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-28 00:20 -0700
Re: a try_lock pattern... Paavo Helde <eesnimi@osa.pri.ee> - 2024-09-28 10:53 +0300
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-28 12:18 -0700
Re: a try_lock pattern... scott@slp53.sl.home (Scott Lurndal) - 2024-09-29 18:03 +0000
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-29 20:15 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-29 13:18 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-30 07:53 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-30 16:41 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-10-01 06:45 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-01 11:44 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-10-01 21:40 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-01 12:48 -0700
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-29 12:55 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-28 10:40 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-28 12:55 -0700
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-28 16:30 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-29 08:15 +0200
Re: a try_lock pattern... Muttley@dastardlyhq.com - 2024-09-29 09:01 +0000
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-29 12:54 +0200
Re: a try_lock pattern... Muttley@dastardlyhq.com - 2024-09-29 14:56 +0000
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-29 17:20 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-29 13:24 -0700
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-29 14:03 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-30 07:51 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-01 12:34 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-10-02 00:58 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-29 14:45 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-30 07:52 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-30 18:11 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-10-01 06:47 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-01 11:45 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-30 08:02 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-30 16:37 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-10-01 09:17 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-01 11:49 -0700
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-01 12:37 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-10-02 01:30 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-01 16:37 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-10-02 01:43 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-01 18:20 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-10-02 03:24 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-01 18:25 -0700
Re: a try_lock pattern... Bonita Montero <Bonita.Montero@gmail.com> - 2024-10-02 04:13 +0200
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-10-02 16:57 -0700
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-29 19:53 -0700
Re: a try_lock pattern... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-29 12:58 -0700
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