How to fix thread joining issue

[beautyqueen]

My code hangs up when trying to join the second thread. I looked online, but it seems it is similar to https://stackoverflow.com/questions/33431445/how-do-i-use-while-true-in-threads.
Pseudo code since I do not have the code.

main()
{
   Chain1 generator;
   Chain2 preprocessor;
   Chain3 processor;

   // to communicate to the parent for data transfer
   processsor.makeChild(&generator);
   processor.makeChild(&preprocessor);

   // initialize the threads
   generator.init();
   preprocessor.init();
   processor.init();

   // join the threads
   generator.start();
   preprocessor.start(); // issue here hangs up here trying to join
   processor.start();
}

class Chain1 //or Chain2 or Chain3...
{
     init()
     {
         // stored as a class member
         chain_thread = std::thread(&Chain1::Dofunction, this); // or std::thread(&Chain2::Dofunction, this); // or std::thread(&Chain3::Dofunction, this);
     }
     start()
     {
        chain_thread.join();   
     }
     Dofunction()
     {
         while(true)
         {
             //...  different for each Chain1, Chain2, Chain3
         }
     }

[Peter87]

join() waits until the thread has finished. If the thread runs an infinite loop it means it will never finish so join() will wait forever.