Hello Ion, Title says it all really: the attached mini-program gives me a segmentation fault on ubuntu linux 8.04 with gcc 4.2.3 when trying to read back the shared memory between process invocations (trying a similar program on XP also fails). If the comments on lines 33/34 and 66-67/68-69 are swapped it works as expected. I've also tried and failed to get it working with my own types as well as std::string. Most of the interprocess tests work fine on my system* so I wonder if it's not possible to use UDTs with this sort of shared memory? I couldn't find anything in the docs (so far) that suggests what I'm doing is silly/wrong. Another minor problem I'm getting is that shm_unlink isn't found by default; adding <library>/boost/thread/ to the dependencies in my Jamfile gets around this, but I'm not sure what the 'correct' way of fixing this is (do you want more info about this one?). Thanks for the library, it simplifies what I'm trying to do loads. :) Cheers, Darren [*] - named_condition_test.cpp fails because: """ ../../../boost/interprocess/sync/named_condition.hpp:165: error: 'external_unlock' was not declared in this scope """ ...and unodered_test.cpp fails because: """ ../../../boost/unordered_set.hpp:479: error: 'struct boost::unordered_detail::move_from<boost::unordered_multiset<int, boost::hash<int>, std::equal_to<int>, boost::interprocess::allocator<int, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0u>, boost::interprocess::iset_index>
' has no member named 'base'
<snip> unordered_test.cpp:29: instantiated from here ../../../boost/unordered_set.hpp:479: error: 'struct boost::unordered_detail::move_from<boost::unordered_multiset<int, boost::hash<int>, std::equal_to<int>, boost::interprocess::allocator<int, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0u>, boost::interprocess::iset_index>
' has no member named 'base' """