November 2015 - Boost-users

boost interprocess named_mutex: race condition at creation?
by Liwei Peng 20 Nov '15

20 Nov '15

Hi, I am using named_mutex for synchronization among multiple processes. If all of the processes try to open_or_create the same-name named_mutex: named_mutex mutex(open_or_create, "somename"); 1) Is there any race condition for mutex creation? Or the API will guarantee one will create and all others will open? 2) If there is race condition, what are the work-arounds for this on Linux? Thanks, Liwei

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A few ICL questions.
by Stephen Hewitt 19 Nov '15

19 Nov '15

I'm new to ICL and have a few questions and a problem. Here is my test code which demonstrated (Windows, MSVC 2012): > // "icl_question.cpp" > > >> #include "precomp.hpp" > > #include <iostream> > > #include <utility> > > #include <functional> > > #include <boost/cstdint.hpp> > > #include <boost/icl/closed_interval.hpp> > > #include <boost/icl/interval_map.hpp> > > >> typedef boost::icl::closed_interval<boost::uint16_t> interval_t; > > >> // Based on the in "boost/icl/functors.hpp". > > template <typename Type> struct inplace_assign > > : public boost::icl::identity_based_inplace_combine<Type> > > { > > typedef inplace_assign<Type> type; > > >> void operator()(Type& object, const Type& operand) const > > { > > object = operand; > > } > > }; > > >> // Why is the 7 template parameter not a template template parameter? > > // The code in "boost/icl/detail/design_config.hpp" does not define the > > // ICL_USE_INTERVAL_TEMPLATE_TYPE macro (I assume intentionally) which, if > > // defined, would make it so. > > typedef boost::icl::interval_map > > < > > boost::uint16_t, > > const char*, > > boost::icl::partial_absorber, > > std::less, > > inplace_assign, > > boost::icl::inter_section, > > interval_t > > > map_t; > > >> int main(int argc, char *argv[]) > > { > > using namespace std; > > >> map_t mem; > > // The commented line two down is what I intend, but it asserts at >> runtime. > > // This one works. > > mem += make_pair(interval_t(0, 0xfffe), "RAM"); > > //mem += make_pair(interval_t(0, 0xffff), "RAM"); > > mem += make_pair(interval_t(0xa000, 0xbfff), "Basic ROM"); > > >> cout << hex << mem << endl; > > >> return 0; > > } > > The first question is about the aggregate on collision functionality. I would just like to replace. I have implemented *inplace_assign *which does this but it seems strange that this isn't included. Am I missing something here (I fear I may well be)? The second question is why* interval_map*'s 7th template parameter ( *Interval*) is not a template template parameter. The code in "boost/icl/detail/design_config.hpp" does not define the *ICL_USE_INTERVAL_TEMPLATE_TYPE *macro (I assume intentionally) which, if defined, would make it so. The third question is about a runtime error I'm getting in the above code. The comment in *main *shows the scenario. Basically if I use *0xffff *as the end of the first range I get an ASSERT at runtime whereas 0xfffe works fine. Finally, the documentation seems a little sparse on the function of the *Section* template parameter. Any clarification on that would be appreciated.

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[ICL] seems not to handle sets that contain the maximum element of the domain type.
by Stephen Hewitt 18 Nov '15

18 Nov '15

ICL seems not to handle sets that contain the maximum element of the domain type. I sent a similar mail a day ago, but I've simplified my example. Here's the code: Windows 7 Boost 1.59.0 ----BEGIN CODE--- using namespace std; typedef boost::icl::closed_interval<boost::uint16_t, std::less> interval_t; typedef boost::icl::split_interval_set<boost::uint16_t, std::less, interval_t> set_t; set_t s; s += interval_t(0x0000, 0xffff); s += interval_t(0xa000, 0xbfff); cout << "BAD: " << hex << s << endl; s.clear(); s += interval_t(0x0000, 0xfffe); s += interval_t(0xa000, 0xbfff); cout << "GOOD: " << hex << s << endl; ----END CODE--- ---BEGIN OUTPUT--- BAD: {[0,9fff][a000,ffff]} GOOD: {[0,9fff][a000,bfff][c000,fffe]} ---END OUTPUT--- The bad example seems to fail because the set contains 0xffff. In the good example I use 0xfffe.

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libboost_system-vc110-XXXX_54.lib: Why can't I use the static boost library?
by Andreas Kopeinig 17 Nov '15

17 Nov '15

Hello everybody, I try to use the boost libraries libboost_filesystem.lib and libboost_system.lib, both version 54, in a project about image processing using the Xbox kinect sensor. I want to use the prebuild windows binaries from the following link: http://sourceforge.net/projects/boost/files/boost-binaries/ I referenced the static libs correctly in visual studio in the project properties under "Linker->General->Additional Library Directories" and "Linker->Input->Additional Dependencies" and I also set the path to the headers under "C/C++ -> General-> Additional Include Directories". But when I want to build my code, I get the following linker error: " LNK1181: cannot open file 'libboost_system.obj' ". Why is this happening? Is this object file missing in the archive? If yes, why? In particular I want to use libboost_filesystem-vc110-mt-1_54.lib, libboost_filesystem-vc110-mt-gd-1_54.lib, libboost_system-vc110-mt-1_54.lib and libboost_system-vc110-mt-gd-1.lib Thank you very much, Andy

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help using async_wait
by Lane 17 Nov '15

17 Nov '15

I'm trying to have a file automatically close when a deadline_timer is expired. Seeing that a file is no longer open, another file will get created and a timer started. But I'm having some issues understanding deadline_timer. I believe the io.run() in start_timer blocks (thinking that async_wait shouldn't block), so I tried to put it on it's own thread so that my main would continue to loop and write to the file while a timer is running in the background which would eventually close the file. Anyone see where I'm going wrong? --- void MyFileTimer::start_timer() { ba::deadline_timer timer(io, boost::posix_time::seconds(10)); timer.async_wait(boost::bind(&MyFileTimer::timer_expired, this, _1)); t_thread = unique_ptr<boost::thread>( new boost::thread(boost::bind(&ba::io_service::run, &io))); io.run(); } void MyFileTimer::timer_expired(const boost::system::error_code& e) { // Closing file my_file.flush(); my_file.close(); io.reset(); t_thread->join(); } bool MyFileTimer::create_file() { // ... string filename = my_unique_file_name; my_file.open(filename, ios::out); start_timer(); return true; } --- snip of main --- while (true) { if (!my_file.is_open()) { create_file(); } my_file->write(str); }

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[Algorithm] Boyer-Moore Search - Does it use The Galil Rule?
by Vidya Wasi 14 Nov '15

14 Nov '15

Hi, I've been fiddling with search algorithms and am now relearning Boyer-Moore. From the documentation I cannot tell if the algorithm is using The Galil Rule. Since I'm still inexperienced in understanding the algorithm I'm wondering if the boost implementation do use The Galil Rule? Regards, Boost casual user

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Boost 1.60.0 beta 1 Release Candidate 3 available for testing
by Marshall Clow 14 Nov '15

14 Nov '15

Release candidate files for 1.60.0 beta 3 are available at http://boost.cowic.de/rc/ As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. This helps ensure the candidates build OK before we push them out to SourceForge. Changes since rc1: * Boost.Sprit has been updated and Boost.Log now builds. * Boost.Math has been updated and now builds. [ Note: The RC2 files that I posted yesterday were incorrectly produced. RC3 is identical to what RC2 should have been -- end note ] Known issues: * Errors when building libraries for visual studio: test and type_erasure. * Boost.Test fails when building on Darwin with gcc 4.9.2 The files (and associated md5s) are: MD5 (boost_1_60_0_b1_rc3.7z) = cfac18348700d0e6c1a0e4418a57e9aa MD5 (boost_1_60_0_b1_rc3.tar.bz2) = d3cb5a59e5b38555096814a6bfbcb441 MD5 (boost_1_60_0_b1_rc3.tar.gz) = db9b011547b8933454d0dfe31f7b8551 MD5 (boost_1_60_0_b1_rc3.zip) = 216c7cd0c15c096ece24d2649a272b51 Thanks! -- The release managers

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linker errors in vs2012 and boost 1.59...
by TUELLER, SHAYNE R CIV USAF AFMC 519 SMXS/MXDEC 12 Nov '15

12 Nov '15

All, I'm trying to compile my application which uses boost 1.59 prebuilt binaries for vs2012. Things compile and link just fine in debug mode but I'm having the following linker errors when I try to build in release mode... GRTXserver.obj : error LNK2001: unresolved external symbol "public: void __cdecl boost::container::container_detail::has_member_function_named_construct<clas s boost::container::new_allocator<char> >::BaseMixin::construct(void)" (?construct@BaseMixin@?$has_member_function_named_construct@V?$new_allocator @D@container@boost@@@container_detail@container@boost@@QEAAXXZ) 1>GRTXserver.obj : error LNK2001: unresolved external symbol "public: void __cdecl boost::container::container_detail::has_member_function_named_construct<clas s boost::container::new_allocator<struct boost::container::container_detail::tree_node<struct std::pair<class boost::container::basic_string<char,struct std::char_traits<char>,class boost::container::new_allocator<char> > const ,struct boost::interprocess::ipcdetail::ref_count_ptr>,void *,0,1> > >::BaseMixin::construct(void)" (?construct@BaseMixin@?$has_member_function_named_construct@V?$new_allocator @U?$tree_node@U?$pair@$$CBV?$basic_string@DU?$char_traits@D@std@@V?$new_allo cator@D@container@boost@@@container@boost@@Uref_count_ptr@ipcdetail@interpro cess@3@@std@@PEAX$0A@$00@container_detail@container@boost@@@container@boost@ @@container_detail@container@boost@@QEAAXXZ) 1>C:\GRTXserver\x64\Release\GRTXserver.exe : fatal error LNK1120: 2 unresolved externals I've tried everything but I just can't get it to work. Any ideas or is anyone else having this problem? Thanks, -Shayne

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Boost 1.60.0 beta 1 Release Candidates available for testing
by Marshall Clow 11 Nov '15

11 Nov '15

Release candidate files for 1.60.0 beta 1 are available at http://boost.cowic.de/rc/ As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. This helps ensure the candidates build OK before we push them out to SourceForge. IMPORTANT NOTE: The files (and associated md5s) are: MD5 (boost_1_60_0_b1_rc1.7z) = ac6b2128d951ad688421fde2d878c2a7 MD5 (boost_1_60_0_b1_rc1.tar.bz2) = 2fc232f255f1ce8868315da207c05b6b MD5 (boost_1_60_0_b1_rc1.tar.gz) = d594e10f2761abaf957a67c6a223d2a4 MD5 (boost_1_60_0_b1_rc1.zip) = 16a2d512fca7995d5fa421d13f841b0f Thanks! -- The release managers

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[coroutines2] Building coroutines2 examples
by Adi Shavit 10 Nov '15

10 Nov '15

Hi, I'm trying to build the Boost 1.59 coroutine and coroutine2 examples. I built boost with b2 (complete build) and am using CMake to generate a VC2015 project to build the samples. All the coroutine samples build and run just fine, but I get *linking* errors with the coroutine2 samples. My CMakeLists.txt file is straightforward, just find boost, include the headers and link to the boost libs: project (coroutines-samples) cmake_minimum_required(VERSION 2.8) find_package(Boost REQUIRED) include_directories(${Boost_INCLUDE_DIR}) link_directories(${Boost_LIBRARY_DIRS}) add_executable(chaining.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/chaining.cpp) add_executable(echo.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/echo.cpp) add_executable(exception.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/exception.cpp) add_executable(fibonacci.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/fibonacci.cpp) add_executable(layout.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/layout.cpp) add_executable(parallel.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/parallel.cpp) add_executable(power.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/power.cpp) add_executable(same_fringe.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/same_fringe.cpp) add_executable(segmented_stack.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/segmented_stack.cpp) add_executable(simple.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/simple.cpp) add_executable(unwind.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/unwind.cpp) add_executable(dice_game.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/symmetric/dice_game.cpp) add_executable(merge_arrays.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/symmetric/merge_arrays.cpp) add_executable(segmented_stack1.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/symmetric/segmented_stack.cpp) add_executable(simple1.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/symmetric/simple.cpp) add_executable(unwind1.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/symmetric/unwind.cpp) add_executable(await_emu.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp11/asymmetric/await_emu.cpp) add_executable(fibonacci11.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp11/asymmetric/fibonacci.cpp) add_executable(iterator_range.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp11/asymmetric/iterator_range.cpp) add_executable(layout11.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp11/asymmetric/layout.cpp) add_executable(same_fringe11.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp11/asymmetric/same_fringe.cpp) add_executable(merge_arrays1.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp11/symmetric/merge_arrays.cpp) add_executable(simple2.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp11/symmetric/simple.cpp) # coroutines2 add_executable(coro2_fibonacci /some/path/boost_1_59_0/libs/coroutine2/example/fibonacci.cpp) add_executable(coro2_layout /some/path/boost_1_59_0/libs/coroutine2/example/layout.cpp) add_executable(coro2_parser /some/path/boost_1_59_0/libs/coroutine2/example/parser.cpp) add_executable(coro2_same_fringe /some/path/boost_1_59_0/libs/coroutine2/example/same_fringe.cpp) add_executable(coro2_segmented /some/path/boost_1_59_0/libs/coroutine2/example/segmented.cpp) add_executable(coro2_simple /some/path/boost_1_59_0/libs/coroutine2/example/simple.cpp) target_link_libraries(chaining.cpp ${Boost_LIBRARIES}) target_link_libraries(echo.cpp ${Boost_LIBRARIES}) target_link_libraries(exception.cpp ${Boost_LIBRARIES}) target_link_libraries(fibonacci.cpp ${Boost_LIBRARIES}) target_link_libraries(layout.cpp ${Boost_LIBRARIES}) target_link_libraries(parallel.cpp ${Boost_LIBRARIES}) target_link_libraries(power.cpp ${Boost_LIBRARIES}) target_link_libraries(same_fringe.cpp ${Boost_LIBRARIES}) target_link_libraries(segmented_stack.cpp ${Boost_LIBRARIES}) target_link_libraries(simple.cpp ${Boost_LIBRARIES}) target_link_libraries(unwind.cpp ${Boost_LIBRARIES}) target_link_libraries(dice_game.cpp ${Boost_LIBRARIES}) target_link_libraries(merge_arrays.cpp ${Boost_LIBRARIES}) target_link_libraries(segmented_stack1.cpp ${Boost_LIBRARIES}) target_link_libraries(simple1.cpp ${Boost_LIBRARIES}) target_link_libraries(unwind1.cpp ${Boost_LIBRARIES}) target_link_libraries(await_emu.cpp ${Boost_LIBRARIES}) target_link_libraries(fibonacci11.cpp ${Boost_LIBRARIES}) target_link_libraries(iterator_range.cpp ${Boost_LIBRARIES}) target_link_libraries(layout11.cpp ${Boost_LIBRARIES}) target_link_libraries(same_fringe11.cpp ${Boost_LIBRARIES}) target_link_libraries(merge_arrays1.cpp ${Boost_LIBRARIES}) target_link_libraries(simple2.cpp ${Boost_LIBRARIES}) target_link_libraries(coro2_fibonacci ${Boost_LIBRARIES}) target_link_libraries(coro2_layout ${Boost_LIBRARIES}) target_link_libraries(coro2_parser ${Boost_LIBRARIES}) target_link_libraries(coro2_same_fringe ${Boost_LIBRARIES}) target_link_libraries(coro2_segmented ${Boost_LIBRARIES}) target_link_libraries(coro2_simple ${Boost_LIBRARIES}) The linked does not seem to be able to find boost::system::system_category. This is my error log: 11>------ Build started: Project: coro2_fibonacci, Configuration: Debug x64 ------ 2>------ Build started: Project: coro2_layout, Configuration: Debug x64 ------ 3>------ Build started: Project: coro2_parser, Configuration: Debug x64 ------ 4>------ Build started: Project: coro2_same_fringe, Configuration: Debug x64 ------ 5>------ Build started: Project: coro2_segmented, Configuration: Debug x64 ------ 6>------ Build started: Project: coro2_simple, Configuration: Debug x64 ------ 1>libboost_context-vc140-mt-gd-1_59.lib(stack_traits.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system @boost@@YAAEBVerror_category@12@XZ) referenced in function "public: __cdecl boost::thread_exception::thread_exception(int,char const *)" (??0thread_exception@boost@@QEAA@HPEBD@Z) 1>\some\path\Coroutines\build\vs2015.x64\Debug\coro2_fibonacci.exe : fatal error LNK1120: 1 unresolved externals 4>libboost_context-vc140-mt-gd-1_59.lib(stack_traits.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system @boost@@YAAEBVerror_category@12@XZ) referenced in function "public: __cdecl boost::thread_exception::thread_exception(int,char const *)" (??0thread_exception@boost@@QEAA@HPEBD@Z) 4>\some\path\Coroutines\build\vs2015.x64\Debug\coro2_same_fringe.exe : fatal error LNK1120: 1 unresolved externals 6>libboost_context-vc140-mt-gd-1_59.lib(stack_traits.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system @boost@@YAAEBVerror_category@12@XZ) referenced in function "public: __cdecl boost::thread_exception::thread_exception(int,char const *)" (??0thread_exception@boost@@QEAA@HPEBD@Z) 2>libboost_context-vc140-mt-gd-1_59.lib(stack_traits.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system @boost@@YAAEBVerror_category@12@XZ) referenced in function "public: __cdecl boost::thread_exception::thread_exception(int,char const *)" (??0thread_exception@boost@@QEAA@HPEBD@Z) 3>libboost_context-vc140-mt-gd-1_59.lib(stack_traits.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system @boost@@YAAEBVerror_category@12@XZ) referenced in function "public: __cdecl boost::thread_exception::thread_exception(int,char const *)" (??0thread_exception@boost@@QEAA@HPEBD@Z) 5>libboost_context-vc140-mt-gd-1_59.lib(stack_traits.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system @boost@@YAAEBVerror_category@12@XZ) referenced in function "public: __cdecl boost::thread_exception::thread_exception(int,char const *)" (??0thread_exception@boost@@QEAA@HPEBD@Z) 6>\some\path\Coroutines\build\vs2015.x64\Debug\coro2_simple.exe : fatal error LNK1120: 1 unresolved externals 2>\some\path\Coroutines\build\vs2015.x64\Debug\coro2_layout.exe : fatal error LNK1120: 1 unresolved externals 3>\some\path\Coroutines\build\vs2015.x64\Debug\coro2_parser.exe : fatal error LNK1120: 1 unresolved externals 5>\some\path\Coroutines\build\vs2015.x64\Debug\coro2_segmented.exe : fatal error LNK1120: 1 unresolved externals 7>------ Skipped Build: Project: ALL_BUILD, Configuration: Debug x64 ------ 7>Project not selected to build for this solution configuration ========== Build: 0 succeeded, 6 failed, 25 up-to-date, 1 skipped ========== What am I doing wrong? Thanks, Adi

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