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Re: A thread-queue

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From Bo Persson <bo@bo-persson.se>
Newsgroups comp.lang.c++
Subject Re: A thread-queue
Date Thu, 26 May 2022 01:04:37 +0200
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On 2022-05-25 at 22:58, Chris M. Thomasson wrote:
> On 5/23/2022 7:07 PM, Bonita Montero wrote:
>> This is a thread-queue I've written:
> [...]
>> template<typename QueueType>
>>      requires thread_queue_concept<QueueType>
>> thread_queue<QueueType> 
>> &thread_queue<QueueType>::thread_queue::operator =( thread_queue const 
>> &other )
>> {
>>      std::lock_guard
>>          ourLock( m_mtx ),
>>          otherLock( other.m_mtx );
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> This is a little scary. lock ordering issues come to mind. Fwiw, this is 
> why I created multimutex:
> 
> https://groups.google.com/g/comp.lang.c++/c/sV4WC_cBb9Q/m/5JRwvhpVCAAJ
> 

The standard library version is scoped_lock that should handle lock ordering

std::scoped_lock locks(m_mtx, other.m_mtx);


https://en.cppreference.com/w/cpp/thread/scoped_lock

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Thread

A thread-queue Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-24 04:07 +0200
  Re: A thread-queue "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-05-25 13:58 -0700
    Re: A thread-queue Bo Persson <bo@bo-persson.se> - 2022-05-26 01:04 +0200
      Re: A thread-queue "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-05-25 20:58 -0700
      Re: A thread-queue Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-26 16:20 +0200
        Re: A thread-queue "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-05-26 22:40 -0700
          Re: A thread-queue Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-27 11:33 +0200
            Re: A thread-queue Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-27 14:26 +0200
              Re: A thread-queue "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-05-27 14:18 -0700
                Re: A thread-queue scott@slp53.sl.home (Scott Lurndal) - 2022-05-27 21:53 +0000
                Re: A thread-queue "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-05-27 15:43 -0700
                Re: A thread-queue scott@slp53.sl.home (Scott Lurndal) - 2022-05-28 14:51 +0000
                Re: A thread-queue "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-05-27 18:24 -0700
                Re: A thread-queue "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-05-27 18:26 -0700
                Re: A thread-queue scott@slp53.sl.home (Scott Lurndal) - 2022-05-28 14:56 +0000
                Re: A thread-queue "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-05-28 16:49 -0700
                Re: A thread-queue red floyd <no.spam.here@its.invalid> - 2022-05-28 17:16 -0700
                Re: A thread-queue "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-05-30 16:00 -0700
                Re: A thread-queue Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-28 07:16 +0200
    Re: A thread-queue Bonita Montero <Bonita.Montero@gmail.com> - 2022-05-26 16:15 +0200

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