XPost: linux.debian.ports.hurd   
   From: mattias.ellert@physics.uu.se   
      
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   Package: src:gcc-15   
   Version: 15.2.0-13   
   Severity: serious   
   User: debian-hurd@lists.debian.org   
   Usertags: hurd-i386   
   X-Debbugs-CC: debian-hurd@lists.debian.org    
      
   When the following code is compiled on Linux, it behaves as expected   
   and returns after 2 seconds.   
      
   #include    
   #include    
      
   int main() {   
     std::condition_variable cv;   
     std::mutex mx;     
     std::unique_lock lk(mx);   
     cv.wait_for(lk, std::chrono::seconds(2));   
   }   
      
   $ g++ -o wait_for wait_for.cxx   
   $ time ./wait_for    
      
   real	0m2,002s   
   user	0m0,001s   
   sys	0m0,001s   
      
   However, when compiled on GNU/Hurd (Debian porterbox exodar.debian.net)   
   it hangs forever and must be forced to quit with ctrl-C.   
      
   ellert@exodar:~$ g++ -o wait_for wait_for.cxx -pthread   
   ellert@exodar:~$ ./wait_for    
   ^C   
      
   Replacing   
     cv.wait_for(lk, std::chrono::seconds(2));   
   with   
     cv.wait_until(lk, std::chrono::steady_clock::now() + std::chro   
   o::seconds(2));   
      
   Gives the same result -- which is expected since these should be   
   equivalent according to the standard.   
      
   If   the system clock is used instead of the steady clock it works also   
   on GNU/Hurd:   
     cv.wait_until(lk, std::chrono::system_clock::now() + std::chro   
   o::seconds(2));   
      
   But this is not the proper fix for the problem.   
      
   This behaviour causes test failures during package builds on GNU/Hurd.   
      
   Mattias Ellert   
      
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