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boost::mutex synchronization problem
by Zachary Turner 05 May '09

05 May '09

I've been trying to figure out if there's a simple way using condition variables and mutexes to design a function with the following properties (cliffs notes first, and then longer version in case it's not enough info): 1) there is a section of code in the function such that two threads cannot enter that section at the same time. 2) after leaving the section of code, the thread should wait for something to happen (signalled by another thread) 3) the waits in step 2 should be awoken in the order they occured. Basically there are many threads that may want to post requests to read/write from the network. So I have a bounded buffer implementation that holds "work items", which can be of read requests or write requests. writes return immediately, but reads block until the read is finished, which is determined by when the actual network thread processes the work item and signals something. read requests should be able to enter the queue regardless of whether another read request is already pending, but obviously the blocked threads should awake in the same order that items were inserted into the queue. I thought of making a condition variable for each read work item, and storing it in the work item that goes in the queue, so the network thread can notify that. But I feel like there should be a better way that doesn't require potentially arbitrary numbers of condition variables. Thanks

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What does "RALL-style" means ?
by ZouLei 05 May '09

05 May '09

Hi, everyone. When I refer the document of thread library, a word "RALL-style" appear in the introduction of the class lock_guard: This provides simple RAII-style locking of a Lockable object, to facilitate exception-safe locking and unlocking. I didn't got the main point of this word "RALL-style", could anyone tell me the meaning ? Thanks. Best wishes.

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Quickbook quick start
by Peng Yu 05 May '09

05 May '09

Hi, I wan to use Quickbook to generate documentation for my code to be submit to boost. I understand that Quickbook could help make the code and the documentation consistent. But there is no a tutorial webpage that describes how I can get started with Quickbook. I am wondering if there is somebody could give me some hints on how to use it? Regards, Peng

5 10

Stepping into a boost::function while debugging
by Peter Åberg 05 May '09

05 May '09

Hi, Does anyone have a tip, suggestions or workaround on how one should do to step into the target function of a boost::function while debugging in VS 2008 (VC9), without wading through the boost::function implementation? I have looked around a bit now and have not found any solution except putting a breakpiont in the target function which may not be practical when one does not know which function it is. I get the feeling one have to wait for MS to add a feature like "step through code I don't want to see". But until then, what do you folks do? Designing with delegates in C++ feels a bit like a show-stopper for me until I can step into a delegate target function without getting lost in a haystack. Cheers, Peter

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[gil] raw image resizing problem
by Stephan Menzel 05 May '09

05 May '09

Hi there, I'm trying to resize an image that comes as a raw RGB8 interleaved buffer into another buffer. According to the resize.cpp sample that comes with boost that should work like this: #include <boost/gil/image.hpp> #include <boost/gil/image_view_factory.hpp> #include <boost/gil/typedefs.hpp> #include <boost/gil/extension/numeric/sampler.hpp> #include <boost/gil/extension/numeric/resample.hpp> using namespace boost::gil; rgb8_view_t view = interleaved_view(orig_width, orig_height, reinterpret_cast<rgb8_ptr_t>(original_buffer), orig_width * 3); rgb8_image_t scaled(new_width, new_height); resize_view(view, view(scaled), bilinear_sampler()); I'm getting an compile error in the resize_image line though and don't know what to make of it: : error C2664: 'boost::gil::pixel<ChannelValue,Layout> &boost::gil::image_view<Loc>::operator ()(const boost::gil::point2<T> &) const' : cannot convert parameter 1 from 'boost::gil::rgb8_image_t' to 'const boost::gil::point2<T> &' 1> with 1> [ 1> ChannelValue=boost::gil::bits8, 1> Layout=boost::gil::rgb_layout_t, 1> Loc=boost::gil::rgb8_loc_t, 1> T=ptrdiff_t 1> ] 1> and 1> [ 1> T=ptrdiff_t 1> ] 1> Reason: cannot convert from 'boost::gil::rgb8_image_t' to 'const boost::gil::point2<T>' 1> with 1> [ 1> T=ptrdiff_t 1> ] 1> No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called Any ideas? Thanks... Stephan

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Linux + Boost 1.36.0 + static
by ferdinand.weiher＠gildemeister.com 05 May '09

05 May '09

coLinux gcc 3.4.5 libc 2.3.5 Boost 1.36.0 Hello, I'm new to boost AND Linux and after days trying out different things I just ask here. When starting the build process with <bjam --toolset=gcc --build-type=complete --with-thread link=static install> I get the following log: warning: Graph library does not contain optional GraphML reader. note: to enable GraphML support, set EXPAT_INCLUDE and EXPAT_LIBPATH to the note: directories containing the Expat headers and libraries, respectively. warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. WARNING: No python installation configured and autoconfiguration failed. See http://www.boost.org/libs/python/doc/building.html for configuration instructions or pass --without-python to suppress this message and silently skip all Boost.Python targets Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (don't panic: this is a strictly optional feature). ...patience... ...found 14167 targets... ...updating 43 targets... MkDir1-quick-fix-for-unix bin.v2 MkDir1-quick-fix-for-unix bin.v2/libs MkDir1-quick-fix-for-unix bin.v2/libs/thread MkDir1-quick-fix-for-unix bin.v2/libs/thread/build MkDir1-quick-fix-for-unix bin.v2/libs/thread/build/gcc-3.4.5 MkDir1-quick-fix-for-unix bin.v2/libs/thread/build/gcc-3.4.5/debug MkDir1-quick-fix-for-unix bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static MkDir1-quick-fix-for-unix bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/threading-multi gcc.compile.c++ bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/threading-multi/thread.o gcc.compile.c++ bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/threading-multi/exceptions.o gcc.compile.c++ bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/threading-multi/once.o gcc.archive bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/threading-multi/libboost_thread-gcc34-mt-d-1_36.a /usr/bin/ar: unable to rename 'bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/threading-multi/libboost_thread-gcc34-mt-d-1_36.a' reason: Input/output error "/usr/bin/ar" rc "bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/threading-multi/libboost_thread-gcc34-mt-d-1_36.a" "bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/threading-multi/thread.o" "bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/threading-multi/exceptions.o" "bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/threading-multi/once.o" ...failed gcc.archive bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/threading-multi/libboost_thread-gcc34-mt-d-1_36.a... ...removing bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/threading-multi/libboost_thread-gcc34-mt-d-1_36.a ...skipped <p/usr/local/lib>libboost_thread-gcc34-mt-d-1_36.a for lack of <pbin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/threading-multi>libboost_thread-gcc34-mt-d-1_36.a... ...skipped <p/usr/local/lib>libboost_thread-gcc34-mt-d.a for lack of <p/usr/local/lib>libboost_thread-gcc34-mt-d-1_36.a... MkDir1-quick-fix-for-unix bin.v2/libs/thread/build/gcc-3.4.5/release MkDir1-quick-fix-for-unix bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static MkDir1-quick-fix-for-unix bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/threading-multi gcc.compile.c++ bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/threading-multi/thread.o gcc.compile.c++ bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/threading-multi/exceptions.o gcc.compile.c++ bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/threading-multi/once.o gcc.archive bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/threading-multi/libboost_thread-gcc34-mt-1_36.a /usr/bin/ar: unable to rename 'bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/threading-multi/libboost_thread-gcc34-mt-1_36.a' reason: Input/output error "/usr/bin/ar" rc "bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/threading-multi/libboost_thread-gcc34-mt-1_36.a" "bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/threading-multi/thread.o" "bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/threading-multi/exceptions.o" "bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/threading-multi/once.o" ...failed gcc.archive bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/threading-multi/libboost_thread-gcc34-mt-1_36.a... ...removing bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/threading-multi/libboost_thread-gcc34-mt-1_36.a ...skipped <p/usr/local/lib>libboost_thread-gcc34-mt-1_36.a for lack of <pbin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/threading-multi>libboost_thread-gcc34-mt-1_36.a... ...skipped <p/usr/local/lib>libboost_thread-gcc34-mt.a for lack of <p/usr/local/lib>libboost_thread-gcc34-mt-1_36.a... MkDir1-quick-fix-for-unix bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/runtime-link-static MkDir1-quick-fix-for-unix bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/runtime-link-static/threading-multi gcc.compile.c++ bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/runtime-link-static/threading-multi/thread.o gcc.compile.c++ bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/runtime-link-static/threading-multi/exceptions.o gcc.compile.c++ bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/runtime-link-static/threading-multi/once.o gcc.archive bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/runtime-link-static/threading-multi/libboost_thread-gcc34-mt-sd-1_36.a /usr/bin/ar: unable to rename 'bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/runtime-link-static/threading-multi/libboost_thread-gcc34-mt-sd-1_36.a' reason: Input/output error "/usr/bin/ar" rc "bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/runtime-link-static/threading-multi/libboost_thread-gcc34-mt-sd-1_36.a" "bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/runtime-link-static/threading-multi/thread.o" "bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/runtime-link-static/threading-multi/exceptions.o" "bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/runtime-link-static/threading-multi/once.o" ...failed gcc.archive bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/runtime-link-static/threading-multi/libboost_thread-gcc34-mt-sd-1_36.a... ...removing bin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/runtime-link-static/threading-multi/libboost_thread-gcc34-mt-sd-1_36.a ...skipped <p/usr/local/lib>libboost_thread-gcc34-mt-sd-1_36.a for lack of <pbin.v2/libs/thread/build/gcc-3.4.5 /debug/link-static/runtime-link-static/threading-multi>libboost_thread-gcc34-mt-sd-1_36.a... ...skipped <p/usr/local/lib>libboost_thread-gcc34-mt-sd.a for lack of <p/usr/local/lib>libboost_thread-gcc34-mt-sd-1_36.a... MkDir1-quick-fix-for-unix bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/runtime-link-static MkDir1-quick-fix-for-unix bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/runtime-link-static/threading-multi gcc.compile.c++ bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/runtime-link-static/threading-multi/thread.o gcc.compile.c++ bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/runtime-link-static/threading-multi/exceptions.o gcc.compile.c++ bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/runtime-link-static/threading-multi/once.o gcc.archive bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/runtime-link-static/threading-multi/libboost_thread-gcc34-mt-s-1_36.a /usr/bin/ar: unable to rename 'bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/runtime-link-static/threading-multi/libboost_thread-gcc34-mt-s-1_36.a' reason: Input/output error "/usr/bin/ar" rc "bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/runtime-link-static/threading-multi/libboost_thread-gcc34-mt-s-1_36.a" "bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/runtime-link-static/threading-multi/thread.o" "bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/runtime-link-static/threading-multi/exceptions.o" "bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/runtime-link-static/threading-multi/once.o" ...failed gcc.archive bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/runtime-link-static/threading-multi/libboost_thread-gcc34-mt-s-1_36.a... ...removing bin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/runtime-link-static/threading-multi/libboost_thread-gcc34-mt-s-1_36.a ...skipped <p/usr/local/lib>libboost_thread-gcc34-mt-s-1_36.a for lack of <pbin.v2/libs/thread/build/gcc-3.4.5 /release/link-static/runtime-link-static/threading-multi>libboost_thread-gcc34-mt-s-1_36.a... ...skipped <p/usr/local/lib>libboost_thread-gcc34-mt-s.a for lack of <p/usr/local/lib>libboost_thread-gcc34-mt-s-1_36.a... ...failed updating 4 targets... ...skipped 8 targets... ...updated 31 targets... All the files get created (as far as I can tell) except the skipped and failed *.a ones. When I use "link=shared" instead of "link=static" everything works fine. I've tried different versions of Boost and bjam, different bjam options and so on but same result. What seems really strange is "unable to rename '...' reason: Input/output error". Maybe somebody can help me. Greetings, Ferd DMG Electronics GmbH, Sitz der Gesellschaft: Pfronten; Amtsgericht Kempten (Allg.), HRB 9572; Geschäftsführer: Dipl.-Ing. (TU) Rudolf Hahn; Dipl.- Wirtschaftsing. Darko Sutlar, Dipl.-Kfm. Tobias Bode Ust-Id-Nr: DE 256219491 - Umsatzsteuer-Nr: 349 / 5723 / 2713 http://www.gildemeister.com E-Mail Disclaimer Der Inhalt dieser E-Mail ist ausschliesslich fuer den/die bezeichneten Empfaenger bestimmt. 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Boost.Graph with MST: getting started
by arm2arm 05 May '09

05 May '09

Hello, I would like to start to use Graph for my project, I have seen that boost.Graph has a MST implemented. My problem is that I have points in 3D/2D with properties; I would like to link them together in to MST using their distance/coordinate or some property. Then I would like to extract the groups for the given Edge length. How to organize the container? Thank you beforehand. Arman. -- View this message in context: http://www.nabble.com/Boost.Graph-with-MST%3A-getting-started-tp23383569p23… Sent from the Boost - Users mailing list archive at Nabble.com.

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[Boost 1.39] different naming?
by Christoph 05 May '09

05 May '09

I built Boost 1.38 (and earlier) with the following options --buildid=xxxx --layout=system This resulted in libs named libboost_regex-mt-xxxx.so With Boost 1.39 the libs (they *are* built with multi-threading support) are named 'only' libboost_regex-xxxx.so (note the missing "-mt") When linking against Boost libs I have written -lboost_regex-mt-xxxx in my code. Was that a bad idea (I mean the including -mt part)? I can fix this by passing --buildid=mt-xxxx to get the old names, but I am curious if that change was done on purpose. (I would like to avoid having to change Boost libs' names in my makefiles with every second Boost release or so ;-) So, to make the questions clear: 1) why was the change made? 2) is linking against sth like -lboost_regex-mt a bad idea? If so, why? 3) will the new naming remain? Best regards, and thanks a bunch for a bunch of helpful libs Christoph

2 1

[serialization] Confusion serializing dynamic arrays of pointers.
by John Murray 05 May '09

05 May '09

Let me begin by saying that I am still rather new to C++ as a language. I've only taken one low level university course on the language, and most of my programs are still very limited in scope and functionality. I am attempting to use the serialization library to save and load objects from a dynamic array of pointers. The object to be serialized contains an object***. The first pointer will bring me to an array of 10 elements, from there each element contains an arbitrarily large array of pointers to objects that will be dynamic allocated as they are needed. While I understand that the library can handle simple arrays, as well as pointers to objects, I cannot seem to get it work in this instance. Attempting to serialize the pointer itself results in an error. >In static member function 'static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = spell**]': >instantiated from 'void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = spell**]' >instantiated from 'void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = spell**]' >instantiated from 'void boost::archive::detail::iserializer<Archive, T>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const [with Archive = boost::archive::text_iarchive, T = spell**]' >functions/general.cpp:85: instantiated from here This seems to make sense as there is not way for the library to serialize a pointer without knowing what it is pointing to (and array of arrays in this case). My next choice of action was to try to serialize the pointer just as I had created it during its initialization. My hope was that the library would then be able to reconstruct the object during loading. This is shown in this code. class spellbook { public: //Lots of functions ommited private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar,const unsigned int version){ ar & name; ar & spellcounts; ar & spellarraysize; for(int x=0;x<10;x++){ for(int y=0;y < 10;y++){ ar & spellptr[x][y]; } } ar & target_level; }; string name; int spellcounts[10]; //! Each element of the array keeps track of the number of spells in the spellptr int spellarraysize[10]; //! Size of the array of the spells of each level spell*** spellptr; //! This should point to a 10xY array of spell pointers. First array is of different levels, second of the spell pointers themselves int target_level; //! Shame to waste the memory, but needed to manage archives }; This compiles, but during run time i get the following error when I attempt to load the object immediately after saving it to disk. >terminate called after throwing an instance of 'boost::archive::archive_exception' > what(): stream error >Abort trap I am fairly confident it is not the save/load archive code as I am currently using what is more or less a duplicate of it to serialize other objects in the file. I'd like to keep the currently implementation of pointers as it keeps memory loads as dynamic to the needs of the application as possible. Has anyone had any experience with serializing something of this nature, or care to offer any helpful tips to get serializing and unserializing to work with this situation? I've ommited a large portion of the code as the headers get somewhat large for this posting format. I can include links to the full source code if needed. John

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Re: [Boost-users] Boost-users Digest, Vol 1984, Issue 2
by John Dlugosz 04 May '09

04 May '09

> Date: Sun, 03 May 2009 21:43:59 +0100 > From: Chris Spencer <spencercw(a)googlemail.com> > Subject: [Boost-users] Filesystem: Case insensitive search on case > sensitive systems > To: boost-users(a)lists.boost.org > Message-ID: <49FE020F.6030905(a)googlemail.com> > Content-Type: text/plain; charset=UTF-8 > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi all, > > I am writing a cross-platform program which takes path names from a > Windows-originating file. As such, there is no guarantee that the paths > match the case of what is actually stored in the file system. Does > anyone have any advice on the best way to do a case-insensitive search > to get the correct path? > > Thanks, Chris. > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v2.0.10 (GNU/Linux) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org > > iEYEARECAAYFAkn+AgoACgkQ6iqRtkAADZhrFQCgxL0prbFme94Y6/D6IqNQccT+ > bWYAoPZPopoX4YyhjrkCe/u74YsjZUQM > =SavU > -----END PGP SIGNATURE----- For NTFS, the rules are in the $UpCase (reserved file #10) in the root directory. But don't forget that short-name aliases are also matched against. For FAT, the rules depend on the OEM Code Page used. That's not just because the chars are encoded differently, but the rules are different too. Specifically, does upper-casing a letter keep or remove an accent mark? Or, do some letters not have case equivalents at all? But now FAT has a "longname" in there also, which is stored in USC2. There's the ISO file system used on CDs, with or without Joliet extensions. There's the UFS file system on DVDs. Both have their own standards on what case-insensitivity means, which may or may not be followed by the OS to various degrees. Basically, the rules are specific to the file system and the individual media. If you know those rules (try looking at ReactOS), you still have to match each subdirectory along the path individually and watch for symbolic links and reparse points which can shift you to a different volume with different rules in force. Check out <http://blogs.msdn.com/michkap/archive/2007/10/24/5641619.aspx>, for example. --John (sorry about the footer) TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.

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