4fa10e45   
   From: marc.glisse@gmail.com   
      
   Saeed Amrollahi Boyouki  wrote:   
      
   > Is it valid to join two threads more than one time?   
      
   No.   
      
   >  std::thread t{f};   
   >  t.join();   
   >  t.join();   
      
   >From the standard:   
   bool joinable() const noexcept;   
     Returns: get_id() != id()   
   void join();   
     Requires: joinable() is true.   
     Postconditions: The thread represented by *this has completed. get_id() ==   
   id().   
      
   You may want to check joinable() before calling join(). In what   
   circumstances do you want to potentially join multiple times?   
      
      
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