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Groups > comp.lang.c++ > #120020
| From | Muttley@dastardlyhq.com |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: counting_semaphore question |
| Date | 2024-09-11 14:12 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <vbs8fq$3l2la$1@dont-email.me> (permalink) |
| References | (1 earlier) <vbs01c$3j5mc$1@raubtier-asyl.eternal-september.org> <vbs0tm$3jf62$1@dont-email.me> <vbs1al$3jgnp$1@raubtier-asyl.eternal-september.org> <vbs2fm$3jp23$1@dont-email.me> <vbs7ds$3kplq$1@raubtier-asyl.eternal-september.org> |
On Wed, 11 Sep 2024 15:54:12 +0200
Bonita Montero <Bonita.Montero@gmail.com> boringly babbled:
>Am 11.09.2024 um 14:29 schrieb Muttley@dastardlyhq.com:
>
>> On Wed, 11 Sep 2024 14:10:05 +0200
>
>>> The static parmeter is the maximum counter and the the two is the
>>> initial counter. So two threads can currently acquire that semaphore.
>
>> Sorry, I still don't get it. What do you mean by maximum counter?
>
>If you have a maximum counter of ten and an initial counter of two
>you may increment the counter further eight times until another
>release doesn't increment the counter.
I don't see how it works in practice.
acquire() increments the counter and it won't go beyond 2 (or whatever
you set the maximum thread acquire count to) once 2 have aquired it and
release() decrements it.
I've tried setting the max counters to all sorts of values including zero and
it makes no difference whatsoever to how this code executes:
#include <stdio.h>
#include <unistd.h>
#include <thread>
#include <semaphore>
using namespace std;
counting_semaphore<1> sem(2);
void func(int i)
{
printf("Thread %d waiting\n",i);
sem.acquire();
printf("Thread %d acquired\n",i);
sleep(1);
printf("Thread %d releasing\n",i);
sem.release();
}
int main()
{
thread thr[10];
printf("Max = %d\n",sem.max());
for(int i=0;i < 10;++i) thr[i] = thread(func,i);
for(int i=0;i < 10;++i) thr[i].join();
return 0;
}
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counting_semaphore question Muttley@dastardlyhq.com - 2024-09-11 10:15 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-11 13:48 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-11 12:03 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-11 14:10 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-11 12:29 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-11 15:54 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-11 14:12 +0000
Re: counting_semaphore question David Brown <david.brown@hesbynett.no> - 2024-09-11 16:23 +0200
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-16 14:22 -0700
Re: counting_semaphore question David Brown <david.brown@hesbynett.no> - 2024-09-17 09:22 +0200
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-17 11:56 -0700
Re: counting_semaphore question David Brown <david.brown@hesbynett.no> - 2024-09-18 09:32 +0200
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-19 12:57 +0200
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-19 13:01 +0200
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-19 12:09 -0700
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-19 13:27 -0700
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-19 13:30 -0700
Re: counting_semaphore question Ben Bacarisse <ben@bsb.me.uk> - 2024-09-12 11:25 +0100
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-12 11:00 +0000
Re: counting_semaphore question Andrey Tarasevich <andreytarasevich@hotmail.com> - 2024-09-12 07:34 -0700
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-12 14:53 +0000
Re: counting_semaphore question David Brown <david.brown@hesbynett.no> - 2024-09-13 08:39 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-13 07:26 +0000
Re: counting_semaphore question David Brown <david.brown@hesbynett.no> - 2024-09-13 12:54 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-13 13:21 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-13 15:29 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-13 13:41 +0000
Re: counting_semaphore question David Brown <david.brown@hesbynett.no> - 2024-09-15 17:33 +0200
Re: counting_semaphore question David Brown <david.brown@hesbynett.no> - 2024-09-13 16:46 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-13 14:59 +0000
Re: counting_semaphore question Andrey Tarasevich <andreytarasevich@hotmail.com> - 2024-09-13 07:43 -0700
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-11 13:51 -0700
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-12 04:21 +0200
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-12 11:57 -0700
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-13 14:29 +0200
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-13 12:44 -0700
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-14 01:43 +0200
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-13 22:21 -0700
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-14 12:07 -0700
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-14 09:18 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-14 11:40 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-14 10:58 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-14 13:15 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-14 15:13 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-14 17:26 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-14 15:48 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-14 17:50 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-14 15:55 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-14 17:57 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-15 09:05 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-15 11:48 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-15 09:52 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-15 14:50 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-15 15:28 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-16 05:02 +0200
Re: counting_semaphore question scott@slp53.sl.home (Scott Lurndal) - 2024-09-15 16:27 +0000
Re: counting_semaphore question scott@slp53.sl.home (Scott Lurndal) - 2024-09-15 16:26 +0000
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-14 12:12 -0700
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-14 17:21 -0700
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-15 07:11 +0200
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-14 22:20 -0700
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-15 09:35 +0200
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-15 12:59 -0700
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-16 05:04 +0200
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-16 13:30 -0700
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-14 12:09 -0700
Re: counting_semaphore question Andrey Tarasevich <andreytarasevich@hotmail.com> - 2024-09-11 07:37 -0700
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-11 15:03 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-11 17:27 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-11 16:04 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-11 18:16 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-11 18:16 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-12 04:20 +0200
Re: counting_semaphore question "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2024-09-12 13:00 -0700
Re: counting_semaphore question Andrey Tarasevich <andreytarasevich@hotmail.com> - 2024-09-11 20:56 -0700
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-12 07:43 +0000
Re: counting_semaphore question David Brown <david.brown@hesbynett.no> - 2024-09-12 13:30 +0200
Re: counting_semaphore question Muttley@dastardlyhq.com - 2024-09-12 14:48 +0000
Re: counting_semaphore question Bonita Montero <Bonita.Montero@gmail.com> - 2024-09-12 15:38 +0200
Re: counting_semaphore question Andrey Tarasevich <andreytarasevich@hotmail.com> - 2024-09-12 07:05 -0700
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