Re: [Boost-users] How to call destructor on thread object?

On 21/05/2015 12:12, Lane wrote:

Here's a bit more detail of my current problem.

I have implemented destructors within ClassA and ClassB. When adding this thread to the thread_group, the thread objects destructors are being called as soon as they're added to the thread_group.

struct MyStruct : ... { boost::thread_group threads; };

template void psm_::MyEvent::on_entry(Event const& ev, FSM& sm) { auto bb = std::make_shared(100);

ClassA c_a(bb); ClassB c_b(bb);

threads.add_thread(new boost::thread(c_a); // destructors called here threads.add_thread(new boost::thread(c_b); }

No, what's happening there is that the c_a and c_b temporary objects are being *copied* to the thread, and then the *originals* are being destroyed. The copies owned by the thread remain undestroyed.

I've wrapped the thread_group within unique_ptr so that I can call reset, but I don't even make it to this point because the thread objects have already been destroyed when being added to the thread (and program exits).

template void psm_::MyEvent::on_exit(Event const& ev, FSM& sm) { std::unique_ptrboost::thread_group tg(&threads); tg.reset();

threads.interrupt_all(); threads.join_all(); }

I'm sorry, but you clearly need to go back to school and learn how pointers work. (And then go back and re-read my earlier post. It's the one in MyStruct that has to be a unique_ptr and you're doing it in the wrong order.)