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==16376== Possible data race during read of size 8 at 0x5CD9C98 by thread #2
==16376== Locks held: none
==16376== at 0x403842: std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter>::get() const (unique_ptr.h:305)
==16376== by 0x402BEB: std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter>::operator*() const (unique_ptr.h:291)
==16376== by 0x4025EC: std::__future_base::_State_baseV2::wait() (future:323)
==16376== by 0x403BC5: std::__basic_future<int>::_M_get_result() const (future:681)
==16376== by 0x40324A: std::future<int>::get() (future:760)
==16376== by 0x401CD4: print_int(std::future<int>&) (promises.cpp:8)
==16376== by 0x406D86: void std::_Bind_simple<void (*(std::reference_wrapper<std::future<int> >))(std::future<int>&)>::_M_invoke<0ul>(std::_Index_tuple<0ul>) (functional:1531)
==16376== by 0x406C57: std::_Bind_simple<void (*(std::reference_wrapper<std::future<int> >))(std::future<int>&)>::operator()() (functional:1520)
==16376== by 0x406AFF: std::thread::_Impl<std::_Bind_simple<void (*(std::reference_wrapper<std::future<int> >))(std::future<int>&)> >::_M_run() (thread:115)
==16376== by 0x4EF8C7F: ??? (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21)
==16376== by 0x4C34DB6: ??? (in /usr/lib/valgrind/vgpreload_helgrind-amd64-linux.so)
==16376== by 0x53DF6B9: start_thread (pthread_create.c:333)
==16376==
==16376== This conflicts with a previous write of size 8 by thread #1
==16376== Locks held: none
==16376== at 0x4055FE: void std::swap<std::__future_base::_Result_base*>(std::__future_base::_Result_base*&, std::__future_base::_Result_base*&) (move.h:186)
==16376== by 0x4050FA: std::_Tuple_impl<0ul, std::__future_base::_Result_base*, std::__future_base::_Result_base::_Deleter>::_M_swap(std::_Tuple_impl<0ul, std::__future_base::_Result_base*, std::__future_base::_Result_base::_Deleter>&) (tuple:332)
==16376== by 0x404936: std::tuple<std::__future_base::_Result_base*, std::__future_base::_Result_base::_Deleter>::swap(std::tuple<std::__future_base::_Result_base*, std::__future_base::_Result_base::_Deleter>&) (tuple:742)
==16376== by 0x403950: void std::swap<std::__future_base::_Result_base*, std::__future_base::_Result_base::_Deleter>(std::tuple<std::__future_base::_Result_base*, std::__future_base::_Result_base::_Deleter>&, std::tuple<std::__future_base::_Result_base*, std::__future_base::_Result_base::_Deleter>&) (tuple:1134)
==16376== by 0x402F92: std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter>::swap(std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter>&) (unique_ptr.h:352)
==16376== by 0x40292F: std::__future_base::_State_baseV2::_M_do_set(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*) (future:532)
==16376== by 0x4055A1: void std::_Mem_fn_base<void (std::__future_base::_State_baseV2::*)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*), true>::operator()<std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*, void>(std::__future_base::_State_baseV2*, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*&&, bool*&&) const (in /home/romerohe/proyects/cpp/tests/promises)
==16376== by 0x4050B8: void std::_Bind_simple<std::_Mem_fn<void (std::__future_base::_State_baseV2::*)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*)> (std::__future_base::_State_baseV2*, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*)>::_M_invoke<0ul, 1ul, 2ul>(std::_Index_tuple<0ul, 1ul, 2ul>) (functional:1531)
==16376== Address 0x5cd9c98 is 24 bytes inside a block of size 48 alloc'd
==16376== at 0x4C2F50F: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_helgrind-amd64-linux.so)
==16376== by 0x4060E2: __gnu_cxx::new_allocator<std::_Sp_counted_ptr_inplace<std::__future_base::_State_baseV2, std::allocator<std::__future_base::_State_baseV2>, (__gnu_cxx::_Lock_policy)2> >::allocate(unsigned long, void const*) (new_allocator.h:104)
==16376== by 0x405DFA: std::allocator_traits<std::allocator<std::_Sp_counted_ptr_inplace<std::__future_base::_State_baseV2, std::allocator<std::__future_base::_State_baseV2>, (__gnu_cxx::_Lock_policy)2> > >::allocate(std::allocator<std::_Sp_counted_ptr_inplace<std::__future_base::_State_baseV2, std::allocator<std::__future_base::_State_baseV2>, (__gnu_cxx::_Lock_policy)2> >&, unsigned long) (alloc_traits.h:491)
==16376== by 0x405AF1: std::__allocated_ptr<std::allocator<std::_Sp_counted_ptr_inplace<std::__future_base::_State_baseV2, std::allocator<std::__future_base::_State_baseV2>, (__gnu_cxx::_Lock_policy)2> > > std::__allocate_guarded<std::allocator<std::_Sp_counted_ptr_inplace<std::__future_base::_State_baseV2, std::allocator<std::__future_base::_State_baseV2>, (__gnu_cxx::_Lock_policy)2> > >(std::allocator<std::_Sp_counted_ptr_inplace<std::__future_base::_State_baseV2, std::allocator<std::__future_base::_State_baseV2>, (__gnu_cxx::_Lock_policy)2> >&) (allocated_ptr.h:102)
==16376== by 0x4056D4: std::__shared_count<(__gnu_cxx::_Lock_policy)2>::__shared_count<std::__future_base::_State_baseV2, std::allocator<std::__future_base::_State_baseV2>>(std::_Sp_make_shared_tag, std::__future_base::_State_baseV2*, std::allocator<std::__future_base::_State_baseV2> const&) (shared_ptr_base.h:615)
==16376== by 0x40515D: std::__shared_ptr<std::__future_base::_State_baseV2, (__gnu_cxx::_Lock_policy)2>::__shared_ptr<std::allocator<std::__future_base::_State_baseV2>>(std::_Sp_make_shared_tag, std::allocator<std::__future_base::_State_baseV2> const&) (shared_ptr_base.h:1097)
==16376== by 0x40499D: std::shared_ptr<std::__future_base::_State_baseV2>::shared_ptr<std::allocator<std::__future_base::_State_baseV2>>(std::_Sp_make_shared_tag, std::allocator<std::__future_base::_State_baseV2> const&) (shared_ptr.h:319)
==16376== by 0x403A5B: std::shared_ptr<std::__future_base::_State_baseV2> std::allocate_shared<std::__future_base::_State_baseV2, std::allocator<std::__future_base::_State_baseV2>>(std::allocator<std::__future_base::_State_baseV2> const&) (shared_ptr.h:620)
==16376== by 0x4030F8: std::shared_ptr<std::__future_base::_State_baseV2> std::make_shared<std::__future_base::_State_baseV2>() (shared_ptr.h:636)
==16376== by 0x4032C9: std::promise<int>::promise() (future:1018)
==16376== by 0x401D2A: main (promises.cpp:14)
==16376== Block was alloc'd by thread #1
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