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Re: [Boost-users] text_file_backend with append and rotate (Victor Yankee)
by Victor Whiskey Yankee 09 Dec '12

09 Dec '12

Anyone, Would someone show me what I am doing wrong setting up this logger? I posted on the boost log site too but got no reply there either. Thanks, Vic > Hello everyone! > > How to create a text_file_backend that appends to existing log file and > also has rotation. The init function below always creates a new file every > time I run my program no matter the rotation settings. > > I am using svn version 774 (latest as of Dec 5, 2012. I tried many ways but > no joy. There is not an example like this, and there does not seem to be a > test for appending either, so maybe it is not supported, but that would be > bad. So I must be doing something wrong. > > Here is my function to set up the logger (using my custom severity levels): > > void init() > { > typedef boost::log::sinks::synchronous_sink<boost::log::sinks::text_file_backend > FileSink_t; > > boost::shared_ptr< FileSink_t> mySink(new FileSink_t( > boost::log::keywords::file_name = "%Y%m%d_%H%M%S_%5N.log" > , boost::log::keywords::rotation_size = 16 * 1024 * 1024 /3 > , boost::log::keywords::time_based_rotation =boost::log::sinks::file::rotation_at_time_point(0,0,0) > , boost::log::keywords::auto_flush = true > , boost::log::keywords::open_mode=(std::ios::out |std::ios::app) // seems to have no effect > )); > > // this method of setting append does not seem to work either, so Imust be doing something wrong > mySink->locked_backend()->set_open_mode(std::ios::out|std::ios::app); > > > mySink->locked_backend()->set_file_collector(boost::log::sinks::file::make_collector( > boost::log::keywords::target = "logs" > , boost::log::keywords::max_size = 16 * 1024 * 1024 > , boost::log::keywords::min_free_space = 2 * 16 * 1024 * 1024)); > > mySink->set_filter(boost::log::filters::attr< LOGGING::LOG_LEVEL("Severity", std::nothrow) >= LOGGING::warning); > mySink->locked_backend()->scan_for_files(); mySink->set_formatter( > boost::log::formatters::format("[%1% | %2%] %3%") > % boost::log::formatters::date_time< boost::posix_time::ptime("TimeStamp") > % boost::log::formatters::attr< LOGGING::LOG_LEVEL >("Severity",std::nothrow) > % boost::log::formatters::message()); > > boost::log::core::get()->add_sink(mySink); > boost::log::core::get()->add_global_attribute("TimeStamp",boost::log::attributes::local_clock()); > }

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Boost Filesystem references in static/shared library
by Miguel Guedes 09 Dec '12

09 Dec '12

Hello List, I was using boost::filesystem previously in a project that built an executable but it has now grown and the requirements changed, and I now have to build a portion of the code as a library; preferably an so. Since I've started building code as a library I've been getting errors about invalid references to boost::filesystem. Here's how I'm building the library: $ g++ -DBOOST_ALL_NO_LIB -fPIC -lrt -lstdc++ -shared -pthread -lboost_system -lboost_thread -lboost_filesystem -L/usr/local/lib -ldl -lpthread -lstdc++ -lclang -o libomnis.so cout.o command_line_processor.o command_options_container.o commands_container.o command_base.o command_option_base.o command_option.o command_option_multi.o command_option_integer.o command_option_flag.o command_serve.o command_send.o command_help.o command_version.o register.o unsaved_file.o clang_parameters.o ustring_vector.o string_vector.o request_strings.o source_file.o reply.o omnisource.o omnis.o As you can see I've tried building it with (as well as without) the BOOST_ALL_NO_LIB macro defined. I then compile the main executable as given: $ g++ libomnis.so client.o omnis_command_line_processor.o request_handler.o request_handler_1.0.o request_parser.o server.o connection.o omnisource_loader.o omnis_app.o main.o -o omnis -pthread -lboost_system -lboost_thread -lboost_filesystem -L/usr/local/lib -ldl -lpthread -lstdc++ -lclang -L. -lomnis And this results in the following output: ./libomnis.so: undefined reference to `boost::filesystem2::detail::dir_itr_close(void*&, void*&)' ./libomnis.so: undefined reference to `boost::filesystem2::detail::dir_itr_first(void*&, void*&, std::string const&, std::string&, boost::filesystem2::file_status&, boost::filesystem2::file_status&)' ./libomnis.so: undefined reference to `boost::filesystem2::detail::dir_itr_increment(void*&, void*&, std::string&, boost::filesystem2::file_status&, boost::filesystem2::file_status&)' ./libomnis.so: undefined reference to `boost::filesystem2::detail::status_api(std::string const&, boost::system::error_code&)' ./libomnis.so: undefined reference to `boost::filesystem2::detail::not_found_error()' collect2: error: ld returned 1 exit status What am I missing here? PS: No errors occurred previously when I was just building the executable. -- Miguel

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Why is cref required in this nested bind example?
by Chris Stankevitz 08 Dec '12

08 Dec '12

Hello, Can someone please explain why a cref is needed in the last line of the attached code snippet? Thank you, Chris === #include <boost/bind.hpp> #include <boost/function.hpp> using boost::bind; using boost::cref; using boost::function; void a() { } void b(function<void()>) { } void f() { //bind(b, bind(a)); bind(b, cref(bind(a))); }

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boost shared_ptr with own dtor
by Philipp Kraus 08 Dec '12

08 Dec '12

Hello, I'm using boost::shared_ptr for using a C pointer. The ctor and all functions are called without any problem, but I have got a problem with the dtor. I need to call a C function on the dtor eg cptr_close( mypointer ) How can I this used with boost::shared_ptr? I need the cptr_close call on the pointer member of the dtor on the shared_ptr. Thanks a lot Phil

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[Interprocess] message queue Cannot Allocate Memory
by cons_Pavignani, Antonio 08 Dec '12

08 Dec '12

Dear all, I use the message queue. I create a queue inside a thread (called Thread A) and I use it in another thread (called Thread B). I get this error: Cannot Allocate memory. This is the code related to the Thread A: message_queue::remove(InterprocessQueueName.c_str()); message_queue mq(open_or_create,InterprocessQueueName.c_str(),MAX_INTERPROCESS_SEND_QUEUE_SIZE,CalculatingSizeStructure::maxSizeHMIExtMessage); for(;;) { try { unsigned int priority; std::size_t recvd_size; mq.receive(msgBuffer, CalculatingSizeStructure::maxSizeHMIExtMessage, recvd_size, priority); ... } catch (interprocess_exception &ex) { ... } } This is the code related to the Thread B: boost::interprocess::message_queue *mq = InterprocessQueueManager::getInstance()->openQueue("Library_Queue"); if((mq->try_send(&msgCmdSendStatusToLibraryInfoR,sizeof(LibraryInfo),0))==false) {... } I've looked for that exception, and it seems to be related to the POSIX queue. I've also tried some solutions without results. Any ideas? Thanks in advance, Best Regards Antonio

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Manually cleaning up TSS data in boost 1.49
by Andrew Harvey 08 Dec '12

08 Dec '12

Hi, I am using boost::thread for a plug-in that is loaded by a third-party Linux application. I have no control over the host's threading or when it chooses to unload my code. Unfortunately I experience a crash every time the host thread unloads the .so and terminates. I get the following backtrace: (gdb) bt #0 0x00007fffde12c460 in ?? () #1 0x00000032cf607889 in start_thread () from /lib64/libpthread.so.0 #2 0x00000032cf2e5ccd in clone () from /lib64/libc.so.6 Not much to go on... I am pretty confident the crash is happening in a pthread key destructor registered by Boost. The only parts of the boost::thread library I am currently using are the synchronization classes: shared_mutex, shared_lock, unique_lock, upgrade_lock, upgrade_to_unique_lock I'm not directly using any thread-specific storage myself. What I would like to do is force boost to call its TSS destructor in my plug-in's destroy_dso() function. Is this at all possible? Many thanks, - Andrew

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[boost][mpl] Detect a type sequence type
by Klaim - Joël Lamotte 07 Dec '12

07 Dec '12

Hi, I am writing some functions and classes that accept a sequence of type ( boost::mpl::vector/list currently) as template parameter. I'm looking for a way to enhance type checking by making sure the provided types are... type sequences. I didn't find anything relevant in standard or boost type_trait libraries. So far, I'm guessing there is no way to check that, mainly because such types would be template instances, which make checking this like checking if a type is an instance of a template which is impossible right now (as far as I know anyway). My question is: what are possible ways to enhance type checking on type sequence types? I know some boost developers around here make great efforts to make sure their meta programming libraries make early and good error reporting so maybe they have a solution? PS: I'm using Visual Studio 2012 so I can't use variadic template yet ;___; (can't rely on the CTP) Joel Lamotte

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[Graph] Labeled graph bug
by Kikohs xxx 07 Dec '12

07 Dec '12

Hello, I have created a labeled graph:

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Clients controlling server and other clients
by Gonzalo Garramuno 07 Dec '12

07 Dec '12

I am writing an application in which one of multiple clients need to control the server and the other clients. The example is the timeline of a flipbook player. If one client sets the timeline to 125, both the server and the other clients need to jump to frame 125. If the server's timeline is modified to 200, indeed the timeline needs to be set to the new value in all clients. I am puzzled on how to write this with asio. Any help is appreciated.

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Re: [Boost-users] [Graph] How to do multi source shortest path
by ratnesh kumar 07 Dec '12

07 Dec '12

Hi All, I need to use the parallel dijkstra for multiple source shortest path as mentioned before in this thread. I copied the part of last email below. Is this feature now implemented in BGL ? Thanks Ratnesh

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