id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
8600,"wait_for_any hangs, if called with multiple copies of shared_future referencing same task",Martin Apel <martin.apel@…>,viboes,"The following small test program shows the problem:

{{{
#include <iostream>
#include <boost/thread.hpp>

int calculate_the_answer_to_life_the_universe_and_everything()
{
    return 42;
}

int main(int argc, char* argv[])
{
   boost::packaged_task<int> pt(calculate_the_answer_to_life_the_universe_and_everything);
   boost::shared_future<int> fi1 = boost::shared_future<int>(pt.get_future());
   boost::shared_future<int> fi2 = fi1;

   boost::thread task(boost::move(pt)); // launch task on a thread

   boost::wait_for_any(fi1, fi2);
   std::cout << ""Wait for any returned\n"";
   return (0);
}
}}}

This program hangs infinitely in the call to boost::wait_for_any. From the docs I would expect this to work, because it's allowed to copy shared_futures. If this is not allowed, a possibility would be needed, to find out, if two shared_futures point to the same task or not. Currently wait_for_any is unusable, if there are chances, that multiple shared_futures point to the same result.",Bugs,assigned,To Be Determined,thread,Boost 1.53.0,Problem,,,