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random_device-question

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Is there any guarantee the standard makes that random_device shoudn't
start at the same internal state for all new threads, i.e. the output
of the following code is likey to be different on both lines?

#include <iostream>
#include <mutex>
#include <random>
#include <thread>

using namespace std;

int main()
{
     auto thr = []()
     {
         static mutex  mtx;
         random_device rd;
         mtx.lock();
         cout << rd() << endl;
         mtx.unlock();
     };
     thread t1( thr );
     thread t2( thr );
     t1.join();
     t2.join();
}

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random_device-question Bonita Montero <Bonita.Montero@gmail.com> - 2019-10-12 09:36 +0200
  Re: random_device-question Melzzzzz <Melzzzzz@zzzzz.com> - 2019-10-12 07:39 +0000
    Re: random_device-question Bonita Montero <Bonita.Montero@gmail.com> - 2019-10-12 09:41 +0200
      Re: random_device-question Melzzzzz <Melzzzzz@zzzzz.com> - 2019-10-12 09:10 +0000
        Re: random_device-question Bonita Montero <Bonita.Montero@gmail.com> - 2019-10-12 11:30 +0200
          Re: random_device-question Melzzzzz <Melzzzzz@zzzzz.com> - 2019-10-12 09:39 +0000
            Re: random_device-question Bonita Montero <Bonita.Montero@gmail.com> - 2019-10-12 11:42 +0200
  Re: random_device-question Bonita Montero <Bonita.Montero@gmail.com> - 2019-10-12 09:40 +0200

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