February 2009 - Boost-users

[asio] io_service use in dll leads to service_registry crash
by joshr 18 Feb '09

18 Feb '09

Configuration: 1) Boost 1.37 2) Visual Studio 2008 3) Windows executable using boost's multi-threaded static library, using a static linked multi-threaded run time. 4) A dll I have as part of the project is compiled with the same settings. 5) MFC is not used. The executable creates an io_service (io) and pool of worker threads, each calling io.run(). Afterwards, the executable begins loading DLLs I've written to add specific functionality (i.e plugins). Each of these plugins are passed the executable's io_service so that they can perform asynchronous work against the thread pool. One of the DLLs creates a boost::asio::ip::tcp::acceptor object, passing the io_service to its constructor. This, in turn, eventually calls use_service, which creates a new service and associates it with the service_registry. This is all happening in the DLL. At shut down, I begin unloading the DLLs, giving each a chance to shut down everything (which they do). I then call FreeLibrary() on the DLL's HMODULE handle. After my application completes shutdown, all the destructors hit, as expected. When the destructor of the service_registry hits, I believe its linked list of services is still pointing to a service located in the memory space of the DLL. This results in a crash. I believe this is the case as I can track the pointer to the acceptor_service in a Watch Window. The pointers and the object remain valid until I call "FreeLibrary", at which point they become worthless. I think this is because the DLL and the executable have their own CRT memory space, due to the way I'm linking in the CRT. The service for the acceptor is being created in the DLL's space. When FreeLibrary is called, this space is released to the OS, making the pointer to the object worthless. If that's the case, I believe I'll need to supply my own service creation routine for the DLLs so that the services are created in my executable's memory space. Is this possible? Is there a way to get the service_registry to release a service when it's no longer in use anywhere, or to specify my own new/delete routines the use_service calls should use? Or, is using ASIO in a DLL like this a really really bad idea? If that's the case, how can I tell what other objects in boost could cause these sorts of problems? I'll try to get a project together that reproduces the issue as soon as I can. I can't use the code I have at the moment as it is proprietary. Thanks for any input anyone can provide. -- View this message in context: http://www.nabble.com/-asio--io_service-use-in-dll-leads-to-service_registr… Sent from the Boost - Users mailing list archive at Nabble.com.

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[ASIO] Newbie; How can I access remote_endpoint data in an SSL server
by May James 18 Feb '09

18 Feb '09

Can anybody help a boost::newbie I have generated an ASIO SSL server based on the sample code "server.cpp" How can I determine the Client Address from the ssl_socket which is defined as typedef boost::asio::ssl::stream<boost::asio::ip::tcp::socket> ssl_socket; relevant code is: acceptor_.async_accept(new_session->socket(), boost::bind(&server::handle_accept, this, new_session, boost::asio::placeholders::error)); Thank You

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[assign] Nested initialization of std containers
by Joseph Lisee 18 Feb '09

18 Feb '09

I am trying to use list_of and map_list_of to initialize a std::vector containing std::maps. I am using Boost 1.37 and Mac OS X 10.4 with Apple's G++ 4.0.1. Here is a complete example: #include <vector> #include <map> #include <string> #include <boost/assign/list_of.hpp> using namespace boost::assign; typedef std::map<int, std::string> dict; typedef std::vector<dict> list; int main() { // Works dict d = map_list_of(1,"B")(2,"A"); list l1 = list_of(d); // Does not compile list l2 = list_of(map_list_of(1,"B")(2,"A")); return 0; } Is there some way to get this to work?

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No packets received with boost::asio::ip::udp::socket set to multicast group
by Lennyk 18 Feb '09

18 Feb '09

Hi, I'm using boost 1.35 on a Linux machine. I've written an application which creates a boost::asio::ip::udp::socket, then binds to a certain local address & port - and finally I've created an option to join a boost::asio::ip::multicast::join_group. All seems well, and I see the registration request through a network sniffer. BUT, when I try to receive packets after successfully joining the udp multicast group - I get NOTHING! Needless to say, I see tons of packets streaming through with the sniffer. What am I doing WRONG? Here's my code (just a test application): using namespace std; using namespace boost::asio; int main(int argc, char *argv[]) { if (argc != 4) { // Test for correct number of parameters cerr << "Usage: " << argv[0] << " <Local Address> <Multicast Address> <Port>" << endl; exit(1); } io_service m_io_service; ip::udp::socket m_socket(m_io_service); ip::address localAddress(ip::address_v4::from_string(argv[1])); ip::address multicastAddress(ip::address_v4::from_string(argv[2])); unsigned short port = atoi(argv[3]); // Second arg: port boost::system::error_code error; m_socket.open(ip::udp::v4()); m_socket.bind(ip::udp::endpoint(localAddress, port), error); if (error) { cout << "bind error!" << endl; exit(1); } ip::multicast::join_group option(multicastAddress.to_v4(), localAddress.to_v4()); m_socket.set_option(option); vector<unsigned char> m_receiveBuffer; mutable_buffers_1 buf = buffer((void*)&m_receiveBuffer[0], 1024); int size = (int)m_socket.receive(buf, 0, error); if (error) { cout << "recv error!" << endl; exit(1); } return 0; } Thanks! Lenny.

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Setting thread affinity on Linux using boost::thread
by Lennyk 18 Feb '09

18 Feb '09

Hi, I'm running on Linux and I would like to set a specific thread affinity to each thread I create (i.e. setting each thread to run on a different core/CPU). How can this be done using the boost::thread library? Thanks! Lenny.

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Do the Range Adaptors really depend upon the RegEx static lib?
by Nate Foreman 18 Feb '09

18 Feb '09

Hello, I'm using the range adaptors from the latest version of the range library in the vault. Namely: boost::adaptors::filtered boost::adaptors::transformed The Visual Studio linker was kind enough to inform me that these depend upon the regex static library (libboost_regex-vc80-mt-sgd-1_38.lib). Does anybody know why? I'd rather not build the boost regex lib. Is there any way to avoid this dependency?

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[program options] access violation with _SECURE_SCL turned off
by klaus triendl 18 Feb '09

18 Feb '09

Hi, I'm using the boost 1.36 program options library on windows with msvc++2008, statically linked to my applications. In "debug mode" everything works fine, however, in "release mode" I encounter an access violation when parsing the c++ commandline passed to main() or when parsing the windows commandline with split_winmain(). Note that this happens only if and only if the preprocessor macro _SECURE_SCL gets turned off (_SECURE_SCL=0). scenario 1) Parsing the main() options, even the simple example from the tutorial, section "getting started", terminates with an access violation when calling po::store() without a usable stack trace; scenario 2) A simple call to po::split_winmain(L"\"--test\"") produces a crash. Note the use of a wide character string. The stack trace: boost::program_options::detail::utf8_codecvt_facet::do_in() boost::detail::convert<wchar_t,char,boost::_bi::bind_t<int,boost::_mfi::cmf7<int,std::codecvt<wchar_t,char,int>,int &,char const *,char const *,char const * &,wchar_t *,wchar_t *,wchar_t * &>,boost::_bi::list8<boost::_bi::value<std::codecvt<wchar_t,char,int> const *>,boost::arg<1>,boost::arg<2>,boost::arg<3>,boost::arg<4>,boost::arg<5>,boost::arg<6>,boost::arg<7> > > >() boost::from_8_bit() boost::from_utf8() boost::program_options::split_winmain() wmain(int argc=3407872, wchar_t * * argv=0x00000000) Did somebody encounter this issue? Any solutions? Thanks, Klaus Triendl

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boost::asio::streambuf and wide chars
by Cain Miley 18 Feb '09

18 Feb '09

Hi, currently i have: boost::asio::streambuf request; std::ostream requestStream(&request); requestStream << "hello world"; if i change 'std::ostream' to 'std::wostream' (because streambuf uses char's i assume?) i get an error, how would i do this with wide chars? (sorry if that didn't make much sense)

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Re: [Boost-users] Remove edge
by Gianni Loiacono 18 Feb '09

18 Feb '09

Hi Mr. Michael Olea, thanks for the replay, for the example code and for the help :-) I have tested your code and it works perfectly. But I have a problem, my graph isn't static but dynamic. In fact, the arcs weights are assigned dynamicaly and I don't understand how to adapt your code to my code. Can you help me? Sorry for my poor english, Best regards. This is an example of my code that I want to adapt with remove_edge_if(): #include <iostream> #include <ctime> #include <utility> #include <boost/graph/graph_traits.hpp> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/graph_utility.hpp> using namespace std; using namespace boost; HINSTANCE hInst; namespace boost { enum vertex_idNodo_t { vertex_idNodo = 1111 }; enum edge_arcoProprieta_t { edge_arcoProprieta = 2222 }; BOOST_INSTALL_PROPERTY(vertex, idNodo); BOOST_INSTALL_PROPERTY(edge, arcoProprieta); } typedef property<vertex_idNodo_t, int> NodoProperty; typedef property<edge_capacity_t, long> ArcoProperty; typedef adjacency_list<vecS, vecS, undirectedS, NodoProperty, ArcoProperty> Graph; Graph g; property_map<Graph, vertex_idNodo_t>::type idNodo = get(vertex_idNodo, g); property_map <Graph, edge_capacity_t >::type capacityCut = get(edge_capacity, g); graph_traits < Graph >::edge_iterator ei, ei_end; void deleteEdges() { for (tie(ei, ei_end) = edges(g); ei != ei_end; ++ei) { if (capacityCut[*ei] < 10) { remove_edge(source(*ei,g),target(*ei,g),g); //Error invalidates the edge iterators :( } } } void main() { for (tie(ei, ei_end) = edges(g); ei != ei_end; ++ei) { srand(static_cast<unsigned int>(time(NULL))); capacityCut[*ei] = rand() % 8 + 4; } } Passa a Yahoo! Mail. La webmail che ti offre GRATIS spazio illimitato, antispam e messenger integrato. http://it.mail.yahoo.com/

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Clarification on Array, UNION serialization
by niranjan bangera 18 Feb '09

18 Feb '09

Hi all, I want to clarify myself in serialization of union and array, Please clarify my doubts. Boost Version:1.36.0 Compiler :/_TOOLS_/dist/gnu-gcc-/4.1.1-binutils-2.16.1/x86_64-pc-linux2.4/bin/gcc class A { union my_union { uint64_t array1[ 4]; int64_t array2[4]; double dbl [4]; uint32_t array3 [ 8 ]; int32_t array4 [ 8 ]; float flt [ 8]; uint16_t array5[ 16 ]; int16_t array6[ 16 ]; uint8_t array7 [ 32 ]; int8_t arrray8[ 32 ]; } my_union my_obj; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int file_version) { ar & my_obj.array1; } }; Is it safe to do it, or any othe optimised method is there to do it? how to serialize a dynamicaly allocated array struc my_struct{ int x; } struct new_struct { { my_struct **my_var; ///my_struct is a structure defined before this structure. } In this case do i need to serialize each element int the array manually, Pointed By my_var Is there other some other way to do it... Thanks, Niranjan

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