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boost.interprocess shared memory & stability when a linked application terminates abnormally
by Bijan 27 Jun '08

27 Jun '08

What would happen when a linked application to a shared memory terminates abnormally while it is in the middle of memory allocation or any other structural changes? I guess it could corrupt the whole shared memory and also stability of the other linked applications. Some shared-memory based databases like TimesTen have a mechanism called MicroLogging to protect integrity of the shared memory. Here is a quote from Oracle TimesTen: "Oracle TimesTen protects its shared libraries against application process failures by means of its patented “MicroLogging” algorithm. Consequently, the abnormal termination of a linked application will not affect Oracle TimesTen IMDB's and even other related applications."

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Re: [Boost-users] [serialization] How should I lay down bits?
by François Mauger 27 Jun '08

27 Jun '08

Hi all [Sorry Daryle, this is not an answer to your problem but another question related to it!] Is there a plan to support std::bitset in the boost::s10n library as it is the case for vector/list/map... containers? regards frc -- >>> On Fri, June 27, 2008 9:20 pm, Daryle Walker wrote: > My class contains an array of bits, currently expressed as > boost::array<bool, 512>. Will archives compact representations to > multiple bits per serialized atom, or will they potentially waste a lot of > space? > > Regardless of the answer, I was thinking of compacting the data > myself. One way would be to compact the array into boost::array<unsigned > char, CEIL(512 / CHAR_BIT)> and serialize that. But I've wondered what > happens between systems with differing CHAR_BIT values. The solution I'm > leaning towards is to create a text string like base-64 (pack every 6 bits > together) and serialize that. By the way, a bit stream may not use all > 512 bits and I'm also > tracking (and serializing) a length attribute. I guess I should make sure > that the length is serialized first. How do I serialize an arbitrary text > string? How do I write the serialization routines knowing that one member > (the bit array) is indirectly expressed (i.e. > translate to/from the text string)? I guess I need separate save & load > methods at least. > > -- > Daryle Walker > Mac, Internet, and Video Game Junkie > darylew AT hotmail DOT com > > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > > -- Francois Mauger Laboratoire de Physique Corpusculaire de Caen et Universite de Caen ENSICAEN - 6, Boulevard du Marechal Juin, 14050 CAEN Cedex, FRANCE e-mail: mauger(a)lpccaen.in2p3.fr tel.: (0/+33) 2 31 45 25 12 fax: (0/+33) 2 31 45 25 49

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[serialization] How should I lay down bits?
by Daryle Walker 27 Jun '08

27 Jun '08

My class contains an array of bits, currently expressed as boost::array<bool, 512>. Will archives compact representations to multiple bits per serialized atom, or will they potentially waste a lot of space? Regardless of the answer, I was thinking of compacting the data myself. One way would be to compact the array into boost::array<unsigned char, CEIL(512 / CHAR_BIT)> and serialize that. But I've wondered what happens between systems with differing CHAR_BIT values. The solution I'm leaning towards is to create a text string like base-64 (pack every 6 bits together) and serialize that. By the way, a bit stream may not use all 512 bits and I'm also tracking (and serializing) a length attribute. I guess I should make sure that the length is serialized first. How do I serialize an arbitrary text string? How do I write the serialization routines knowing that one member (the bit array) is indirectly expressed (i.e. translate to/from the text string)? I guess I need separate save & load methods at least. -- Daryle Walker Mac, Internet, and Video Game Junkie darylew AT hotmail DOT com

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[serialization] How do I unit-test serialization?
by Daryle Walker 27 Jun '08

27 Jun '08

Do I just serialize to a memory buffer, then serialize from the same buffer, and then compare the source and destination objects? Should I use a text format (plain and/or XML) with a string-stream source/ sink so I can check by reading? Should I make up a string of a text archive and have my routine try reading it? -- Daryle Walker Mac, Internet, and Video Game Junkie darylew AT hotmail DOT com

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Boost filesystem feature request
by Tristan Wibberley 27 Jun '08

27 Jun '08

Hi Boost devs, I'm looking for a way to write programs with unit tests that don't hit the real filesystem, so there is no cleanup necessary in the event of a segfault, and so that tests run fast and set up is simple. Is the any chance of a future version of boost filesystem implementing the ability to do operations to a memory-based data structure that simulates a real filesystem. It would be especially useful if such a mock filesystem could be configured with failures that should occur to test error handling paths. It would be pretty vital that a test program could still use the regular boost filesystem for its own implementation to access the disk and that several separate filesystems could be mocked at the same time to test client-server application components within a single process. Thanks for listening -- Tristan Wibberley Any opinion expressed is mine (or else I'm playing devils advocate for the sake of a good argument). My employer had nothing to do with this communication.

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serialization of accumulators available?
by Sebastian Weber 27 Jun '08

27 Jun '08

Hi! I'm just starting to use the accumulators package. Cool library btw! I was just wondering if there is some sort of serialization available for the accumulators package. I guess it is for sure possible to somehow serialize the accumulator_set or their corresponding set of extractor objects such that all defined statistics end up being serialized. Is there something available or planned like this? Thanks in advance! Greetings, Sebastian

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Boost.Python produces TypeError on OS X
by Marco Biasini 27 Jun '08

27 Jun '08

Hi! I've got a problem when using boost.python on MacOS X. The program exits with TypeError: attribute name must be string This happens both in boost 1.34 and 1.35. I was however able to run attached snippet without problems with boost 1.33. Code: #include <boost/python.hpp> using namespace boost::python; class CppClass { public: int getNum() { return 7; } }; int main( int argc, char ** argv ) { try { Py_Initialize(); object main_module(( handle<>(borrowed(PyImport_AddModule("__main__"))))); object main_namespace = main_module.attr("__dict__"); main_namespace["CppClass"] = class_<CppClass>("CppClass") .def("getNum",&CppClass::getNum); handle<> ignored(( PyRun_String( "cpp = CppClass();print cpp.getNum() \n", Py_file_input, main_namespace.ptr(), main_namespace.ptr() ) )); } catch( error_already_set ) { PyErr_Print(); } } Specs, if it should matter: * MacOS 10.4.11, 2.14 GhZ Core 2 Duo * Compiler gcc 4.0.1 (Apple, Inc.), Python 2.4 (MacPorts) Any suggestions/directions? Please let me know if you need additional information. Best, Marco

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building tutorial with bjam
by Tony May 27 Jun '08

27 Jun '08

I am trying to build the tutorial example showing how to call a c++ function from a python script. When I run bjam I get the following message. I am using MSVC++ 2005 Express Edition. C:/Program Files/boost/boost_1_35_0/tools/build/v2/tools\msvc.jam:263: in confiure-really *** argument error * rule path.make ( native ) * called with: ( ) * missing argument native C:/Program Files/boost/boost_1_35_0/tools/build/v2/util\path.jam:42: see definiton of rule 'make' being called C:/Program Files/boost/boost_1_35_0/tools/build/v2/tools\msvc.jam:141: in confiure C:/Program Files/boost/boost_1_35_0/tools/build/v2/tools\msvc.jam:115: in msvc.init C:/Program Files/boost/boost_1_35_0/tools/build/v2/build\toolset.jam:38: in tooset.using C:/Program Files/boost/boost_1_35_0/tools/build/v2/build\project.jam:828: in usng C:\Documents and Settings\Tony\user-config.jam:2: in modules.load C:/Program Files/boost/boost_1_35_0/tools/build/v2\build-system.jam:240: in load-config C:/Program Files/boost/boost_1_35_0/tools/build/v2\build-system.jam:373: in load-configuration-files C:/Program Files/boost/boost_1_35_0/tools/build/v2\build-system.jam:501: in load C:\Program Files\boost\boost_1_35_0\libs\python\example\..\..\..\tools\build\v2/ kernel\modules.jam:267: in import C:\Program Files\boost\boost_1_35_0\libs\python\example\..\..\..\tools\build\v2/ kernel/bootstrap.jam:132: in boost-build C:\Program Files\boost\boost_1_35_0\libs\python\example\boost-build.jam:7: in module scope C:\Program Files\boost\boost_1_35_0\libs\python\example\tutorial> ---------------------------------- I created a user-config.jam file in my home directory. Its contents are below. # MSVC configuration using msvc : 8.0 ; # Python configuration using python : 2.5 : C:/Program Files/Python25 ; ------------------------ I got bjam from boost-jam-3.1.16-1-ntx86. Where should the dll that should be produced go?

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AIX hardcodes paths shared libs with generated link command
by Andrej van der Zee 27 Jun '08

27 Jun '08

Hi, I am having some problems linking on AIX with bjam using toolset=gcc. In my project I have one executable and one shared lib. Bjam generates the following linker command for the executable: "g++" -o <all-object-files> "../util/bin/gcc-4.2.4/debug/threading-multi/libspeedo_util.so" -lrt -g -Wl,-brtl -pthread -Wl,-blibpath:/usr/lib/:/speedo/lib:/usr/local/lib Now this results in an executable that does NOT look for libspeedo_util.so in any other directories than the relative path ../util/bin/gcc-4.2.4/debug/threading-multi! This is clearly not what I want. I found that if I link the executable manually like this (with -lspeedo_util and the corresponding -L) it works like expected: "g++" -L"../util/bin/gcc-4.2.4/debug/threading-multi" -o <all-object-files> -lspeedo_util -lrt -g -Wl,-brtl -pthread -Wl,-blibpath:/usr/lib/:/speedo/lib:/usr/local/lib So my guess is that the native AIX linker works different in this respect from the gcc linker on Linux. Is there an easy way to rewrite the linker command in gcc.jam with -L<path-to-lib> and -l<lib>? Cheers, Andrej __________________________________________________________ Not happy with your email address?. Get the one you really want - millions of new email addresses available now at Yahoo! http://uk.docs.yahoo.com/ymail/new.html

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bcp
by Angel Tsankov 27 Jun '08

27 Jun '08

Hi, Can I use bcp to extract files and dependencies from libraries other than boost? If not, what other tool can be used instead? Regards, Angel Tsankov

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