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[boost::thread] Function doesn't work out of the main thread
by Gabriel Weilenmann 28 Sep '07

28 Sep '07

Hi Everyone I have a problem with threads which I don't understand. Well, it might be also connected to OpenCV, because it only occured while calling certain OpenCV functions so far: void callCvShowImage() { // OpenCV function to display an image in a window. cvShowImage("WindowName", image); } void callCvQueryFrame() { // OpenCV function to grab an image from a camera. frame = cvQueryFrame( capture ); } In a single thread program they work as expected: ... callCvShowImage(); //Works well callCvQueryFrame(); //Works well ... In the multithreaded version they don't work. In my oppinion, exactly the same thing should happen as above. But surprisingly the functions suddenly don't execute anymore. thrdXX.join() block the program forever... ... boost::thread thrdSI(&callCvShowImage()); thrdSI.join(); // the program never gets to this point ... ... boost::thread thrdQF(&callCvQueryFrame()); thrdQF.join(); // the program never gets till here ... Is there a way to fix this? I could also use the thread library from Microsoft if you think this would help... Obviously, I'm not much into threads. So please try to give me some examples together with your answer Thanks to you people once more Gabriel -- GMX FreeMail: 1 GB Postfach, 5 E-Mail-Adressen, 10 Free SMS. Alle Infos und kostenlose Anmeldung: http://www.gmx.net/de/go/freemail

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Static linking problem on Solaris/SunForte/sparc64.
by Kamil Shakirov 28 Sep '07

28 Sep '07

Hi. I have a problem with static linking on Solaris/sparc64 (Sun Studio 11). This project can be compiled on win32 and Linux. root@sun-ivr: #uname -a SunOS sun-ivr 5.10 Generic_120011-14 sun4u sparc SUNW,UltraSPARCengine_CP-40 /opt/SUNWspro/bin/CC -mt -library=stlport4 -xarch=generic64 -DBOOST_FILESYSTEM_STATIC_LINK -o bin/IPGateway bin/XMLParser.o bin/Utility.o bin/Logger.o bin/Configuration.o bin/Board.o bin/ResourceManager.o bin/main.o -Ltools/lib/solaris-sparc64 -L/opt/nms/lib -lexpat -lboost_date_time-sw-mt -lboost_filesystem-sw-mt -lboost_regex-sw-mt -lboost_log-sw-mt -lboost_system-sw-mt -lboost_thread-sw-mt -lboost_program_options-sw-mt -lcta -ladiapi -lnccapi -lvceapi -ladidtm -lmccsdp -lmspapi -lswiapi -lnsl -lsocket -lresolv -ldl -lthread -lpthread -lrt ld: fatal: symbol `const char*boost::filesystem::basic_filesystem_error<boost::filesystem::basic_path<std::string,boost::filesystem::path_traits> >::what()const' is multiply-defined: (file bin/Logger.o type=FUNC; file tools/lib/solaris-sparc64/libboost_filesystem-sw-mt.a(operations.o) type=FUNC); ld: fatal: File processing errors. No output written to bin/IPGateway scons: *** [bin/IPGateway] Error 1 scons: building terminated because of errors.

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Can I walk the slot list in a signal?
by Nicholas Bastin 28 Sep '07

28 Sep '07

I'm having a problem on 64-bit windows (no other platform, 32 or 64-bit), where only the first slot in a signal is being called. No exception is being thrown, which is usually how this kind of thing happens. Is there any way for me to walk the list of connected slots right before I invoke the signal? It would be helpful if I knew if somehow the slot had become disconnected, or if boost::signal just wasn't invoking for some other reason. -- Nick

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Unhandled exception when call dynamic_bitset's append.
by Wang, Ronnie 28 Sep '07

28 Sep '07

Hi all, My first time use dynamic_bitset like the following way: int index = m_pData->Size(); U8* pData = m_pData->DataBuffer(); boost::dynamic_bitset<>temp(8,pData[index - 1]); int i = 0; for (i = index - 2; i >= 0; i--) { temp.append(pData[i]); temp.resize((index -i)*8); } m_RowBitTag = temp; Here the U8 is unsigned char. When run to temp.append(pData[i]); it will get an unhandled exception. My environment is VC++ 6 Best Regards, -Ronnie

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How is asio::error supposed to work? Tutorial is generating compiler errors
by console shark 28 Sep '07

28 Sep '07

I am trying to compile the tutorial for boost asio, specifically the daytime client (http://asio.sourceforge.net/asio-0.3.7/doc/tutorial/tutdaytime1.html) The following line generates a compile time error. Compiler is VC8. Maybe I'm missing something but is this tutorial out of date? Because I also don't see any implementation of assign_error method which is also liberally used throughout the explanations on that page. boost::asio::error error = boost::asio::error::host_not_found; error C2440: 'initializing' : cannot convert from 'const boost::system::error_code' to 'boost::asio::error' 1> No constructor could take the source type, or constructor overload resolution was ambiguous ____________________________________________________________________________________ Got a little couch potato? Check out fun summer activities for kids. http://search.yahoo.com/search?fr=oni_on_mail&p=summer+activities+for+kids&…

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[review] Review of Exception begins today
by Tobias Schwinger 27 Sep '07

27 Sep '07

The formal review of the Exception library, proposed by Emil Dotchevski, begins today. The library provides an exception class that can transport arbitrary values, thus freeing the user from designing custom exception classes. The library can be downloaded at http://tinyurl.com/24wtwu and its documentation can be read online at http://tinyurl.com/2bkojl . What to include in Review Comments ================================== Your comments may be brief or lengthy, but basically the Review Manager needs your evaluation of the library. If you identify problems along the way, please note if they are minor, serious, or showstoppers. Here are some questions you might want to answer in your review: * What is your evaluation of the design? * What is your evaluation of the implementation? * What is your evaluation of the documentation? * What is your evaluation of the potential usefulness of the library? * Did you try to use the library? With what compiler? Did you have any problems? * How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? * Are you knowledgeable about the problem domain? And finally, every review should answer this question: * Do you think the library should be accepted as a Boost library? Be sure to say this explicitly so that your other comments don't obscure your overall opinion. We're looking forward to your evaluation of this Boost candidate! Tobias Schwinger - Review Manager -

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Boost Test manual in pdf
by Peng Yu 27 Sep '07

27 Sep '07

Hi, I would like the manual http://www.boost.org/libs/test/doc/index.html in pdf format. Can somebody let me know how to generate one if one is not available? Or is there one available? Thanks, Peng

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Problems building boost on 10.3.9
by Amit Bhatia 27 Sep '07

27 Sep '07

Hi, I am trying to use darwinports to install boost 1.34.0, Revision 1, on OS X 10.3.9 with gcc version 3.3 20030304 (Apple Computer, Inc. build 1671) and there seems to be some problem. After issuing "sudo port install boost", I get the message: Staging boost into destroot and then from there on it takes on forever. At the same time there is a process running cc1plus that seems to be eating away all the RAM, and the virtual memory being used by it increases to almost 2 Gb and my computer slows down. So my question is: is there some known problem with this version of boost on this version of gcc/OS? If not, then is there a very simple way of installing boost 1.34 on this OS? The last time I used bjam for some other version, I had lots of problems, but the installation went smoothly using darwinports. thanks, --a. --------------------------------- Shape Yahoo! in your own image. Join our Network Research Panel today!

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[borland] Which version of bcc32 and of Boost do you use?
by Nicola Musatti 27 Sep '07

27 Sep '07

[Sorry for the repost from boost.develop . This message belonged here in the first place] Hallo, I'd be interested in knowing which version of Boost do people use with which version of the Borland/CodeGear compilers. The reason I'm asking relates to the state of Boost regression tests for the version currently being developed, as can be seen here: http://beta.boost.org/development/tests/trunk/developer/summary.html As you can see the situation is not very good. Moreover, while I still have to apply the latest bcbboost patches for 5.9.2, 5.6.4 and 5.8.2 should already have the same level of support they had in Boost 1.34 . Unless there's a substantial demand it looks highly likely that support for at least BCB6 will have to be dropped or, more precisely, be left to rot. Contributions are an even more effective way to avoid it :-) Cheers, Nicola -- Nicola.Musatti <at> gmail <dot> com Home: http://nicola.musatti.googlepages.com/home Blog: http://wthwdik.wordpress.com/

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Re: [Boost-users] Kamada kawai spring layout algorithm
by Meththa 27 Sep '07

27 Sep '07

>>Meththa wrote: >> I want to use the Kamada Kawai spring layout algorithm and I do not >> know what to pass for the final parameter when calling the function. >> the template of the function is given below. >> >> *template*<*typename* Graph, *typename* PositionMap, *typename* >> WeightMap, *typename* T, *bool* EdgeOrSideLength> >> *bool* kamada_kawai_spring_layout(*const* Graph & g, PositionMap >> position, WeightMap weight, /unspecified/ edge_or_side_length); >> I do not understand what value needs to be given and what type for >> /unspecified edge_or_side_length./ >> // > >Can someone please point me in the right direction with regards to this. >If you want the side of the bounding box to be of length "s", pass >boost::side_length(s) >If you want the "normal" edge length to be e, pass boost::edge_length(e). > > - Doug Is the bouding box the placement area? I tried both ways you have suggested above and i can't seem to get rid of the compiler errors. If I leave boost::side_length(s) as it is, the compiler complains 's' is not instantiated. If I give a value instead of 's', it complains as follows. C:/boost_1_34_1/boost/graph/kamada_kawai_spring_layout.hpp: In function `bool boost::kamada_kawai_spring_layout(const Graph&, PositionMap, WeightMap, boost::detail::graph::edge_or_side<EdgeOrSideLength, T>) [with Graph = Graph, PositionMap = boost::iterator_property_map<__gnu_cxx::__normal_iterator<boost::simple_point<double>*, std::vector<boost::simple_point<double>, std::allocator<boost::simple_point<double> > > >, boost::vec_adj_list_vertex_id_map<boost::no_property, size_t>, boost::simple_point<double>, boost::simple_point<double>&>, WeightMap = boost::adj_list_edge_property_map<boost::undirected_tag, boost::detail::error_property_not_found, boost::detail::error_property_not_found&, size_t, boost::no_property, boost::edge_weight_t>, T = int, bool EdgeOrSideLength = false]': main2.cpp:57: instantiated from here C:/boost_1_34_1/boost/graph/kamada_kawai_spring_layout.hpp:535: no matching function for call to `boost::detail::error_property_not_found:: error_property_not_found(double)' Can you shed some light on this please. Thanks - Meththa ____________________________________________________________________________________ Be a better Globetrotter. Get better travel answers from someone who knows. Yahoo! Answers - Check it out. http://answers.yahoo.com/dir/?link=list&sid=396545469

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