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Thread prioritization on OSX
by Alexander Carôt 13 Dec '14

13 Dec '14

Hello all, according to this: http://www.boost.org/doc/libs/1_57_0/doc/html/thread/thread_management.html #thread.thread_management.tutorial.attributes I tried to change the thread priority to SCHED_RR on OS X via: boost::thread::attributes attrs; pthread_attr_setschedpolicy(attrs.get_native_handle(), SCHED_RR); sendThread = boost::thread(attrs,&sender::sendItThreadFunction,this); In that context I noticed that get_native_handle is not known so I used attr.native_handle(), which compiled ok but finally threw an error here: /boost/boost/bind/bind.hpp:313:9: Type 'boost::thread_attributes' does not provide a call operator I am still using boost 1.45 and wonder if this is the actual problem or if something else is wrong. Any help appreciated, thanks Alex Am 20.11.14 10:53 schrieb "Ben Pope" unter <benpope81(a)gmail.com>: >On Thursday, November 20, 2014 05:27 PM, Alexander Carôt wrote: >> Hello all, >> >> is it correct that boost does not offer thread prioritization ? > >There's nothing directly on the interface. > >> I am dealing with an application with a number of threads, which all >> depend on the realtime-scheduled sound card callback thread. >> >> These threads must have the same realtime scheduling priority. >> >> Is there a way to achieve this ? > >Basically there's a platform specific back door: native_handle. > >http://www.boost.org/doc/libs/1_57_0/doc/html/thread/thread_management.htm >l#thread.thread_management.tutorial.attributes > >Ben > > > >_______________________________________________ >Boost-users mailing list >Boost-users(a)lists.boost.org >http://lists.boost.org/mailman/listinfo.cgi/boost-users

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BOOST_CLASS_EXPORT_GUID with custom archive
by Elizabeta 13 Dec '14

13 Dec '14

Hi I am using boost 1.49. I have custom archives derived from the boost binary archives. However it seems that when using BOOST_CLASS_EXPORT_GUID the types are not actually registered for the custom archive types, and I am getting unregistered_class exception when serializing derived class from base pointer. If I am using the boost binary original archives this is not the case. My custom archive classes are defined in in its own header file and at the end of the file I am including BOOST_SERIALIZATION_REGISTER_ARCHIVE, according to this in the documentation : " The newly created archive will usually be stored in its own header module. All that is necessary is to include the header and construct an instance of the new archive. EXCEPT for one special case. Instances of a derived class are serialized through a base class pointer. Such instances are not "registered" neither implicitly nor explicitly. That is, the macro BOOT_CLASS_EXPORT is used to instantiate the serialization code for the included archives. To make this work, the following should be included after the archive class definition. #define BOOST_SERIALIZATION_REGISTER_ARCHIVE(Archive) Failure to do this will not inhibit the program from compiling, linking and executing properly - except in one case. If an instance of a derived class is serialized through a pointer to its base class, the program will throw an unregistered_class exception." here is my archive h file : ------------------- customarchive.h -------------------- #include <boost/archive/binary_iarchive.hpp> #include <boost/archive/binary_oarchive.hpp> #include <boost/archive/binary_oarchive_impl.hpp> #include <boost/archive/binary_iarchive_impl.hpp> #include <boost/archive/shared_ptr_helper.hpp> class CloneBinaryIArchive : // don't derive from binary_oarchive !!! public boost::archive::binary_iarchive_impl< CloneBinaryIArchive, std::istream::char_type, std::istream::traits_type >, public boost::archive::detail::shared_ptr_helper { typedef CloneBinaryIArchive derived_t; typedef boost::archive::binary_iarchive_impl< CloneBinaryIArchive, std::istream::char_type, std::istream::traits_type > base_t; public: CloneBinaryIArchive(std::istream & is,unsigned int flags = 0) : base_t(is, flags) {} CloneBinaryIArchive(std::streambuf & bsb, unsigned int flags = 0) : base_t(bsb, flags) {} int foo; }; BOOST_SERIALIZATION_REGISTER_ARCHIVE(CloneBinaryIArchive) and here is the cpp file in each I am registering all classes : -------------- register.cpp --------------- #include "customarchive.h" #include <boost/serialization/export.hpp> #include "A.h" BOOST_CLASS_EXPORT_GUID(A,"A") -- View this message in context: http://boost.2283326.n4.nabble.com/BOOST-CLASS-EXPORT-GUID-with-custom-arch… Sent from the Boost - Users mailing list archive at Nabble.com.

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share_ptr and Container compilation error on new version
by JB 13 Dec '14

13 Dec '14

Hello all, I'm trying to build an application. This isn't an app that I wrote but rather inherited. I'm currently porting it from Fedora 15 to Fedora 20. It compiled well on gcc 4.6.3 with boost 1.46.0. However, Fedora 20 has gcc 4.8.3 and boost 1.54. I'm new to boost and have never used it before but it looks very comprehensive. As far as I know boost/shared_ptr is the only header this component of the application is including. I'm wondering if boost changes might be causing this or maybe gcc changes but it's difficult to tell from the documentation and I'm a little under the gun at the moment. This code: template<typename Container> class DefinableVectorFinalizer: public XmlFinalizer { typedef typename Container::value_type contained_value_type; typedef typename Container::value_type::value_type value_type; .... } g++ is throwing this error which seems to have some sort of problem with Container::value_type::value_type: ../../../../../devel/include/xcl/io/DefinableVectorFinalizer.h:31:54: error: no type named ‘value_type’ in ‘xclApp::DefinableVector<boost::shared_ptr<simApp::Project> >::value_type {aka class boost::shared_ptr<mainApp::Project>}’ typedef typename Container::value_type::value_type value_type; xclApp::DefinableVector looks like this: class DefinableVector { public: typedef typename std::vector<T>::size_type size_type; typedef typename std::vector<T>::value_type value_type; typedef value_type& reference; typedef const value_type& const_reference; typedef typename std::vector<T>::iterator iterator; typedef typename std::vector<T>::const_iterator const_iterator; .... } Any insight into this would be hugely appreciated!!!

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intrusive bug: equal_range implementation vs bounded_range precondition
by Matei David 12 Dec '14

12 Dec '14

In the absence of a bug tracker, I'll post the potential bug here: I'm seeing some strange results out of `multiset::equal_range`. I didn't isolate a test case, but looking at the code something seems wrong: The `bstree_algorithms::equal_range(const KeyType &, KeyValueCompare)` method is currently implemented (in `bstree_algorithms.hpp`) as a call to `bstree_algorithms::bounded_range(header, key, key, comp, true, true)`. However, `bounded_range` states as prerequisite: If 'lower_key' == 'upper_key', ('left_closed' or 'right_closed') must be false. Either the `equal_range` implementation or the `bounded_range` precondition is wrong. Matei

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[Math] advice using brent_find_minima()
by dariomt＠gmail.com 12 Dec '14

12 Dec '14

I'd like to find the root of a function f (find x such that f(x) = 0). Should I pass abs( f ) to brent_find_minima()? I can't find examples... Thanks in advance!

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bug tracker not working
by Matei David 12 Dec '14

12 Dec '14

The bug tracker stopped working for me. I tried to post a new bug, and I'm getting a captcha error message below. However, the web interface doesn't display any captcha for me to solve (!?) I tried both Google Chrome & Firefox on Linux. (I disabled various ad blocker extensions.) === Captcha Error Submission rejected as potential spam (StopForumSpam says this is spam (ip)) Trac thinks your submission might be Spam. To prove otherwise please provide a response to the following. === I've seen this message before, with the exact same problem (no captcha), when in the past I had tried to include a (legitimate) link in a bug post. However, after obfuscating the link I was able to post without this error. Now I can't any more. Can somebody look into this? Thanks, Matei

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Flags for strongly typed enum?
by TONGARI J 11 Dec '14

11 Dec '14

Hi there, Is there any library in Boost that provides type-safe enum bit flags? Something like below: enum class option { a = 1, b = 2, c = 4, .... }; DEFINE_FLAGS(options, option); options set1 = option::a | option::b; options set2 = set1 | option::c; options err1 = option::a | 2; // error options err2 = set2 | 2; // error if (set1 & option::a) {...} if (set1 & 2) {...} // error Thanks.

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boost MSM
by Raj Sambasivan 10 Dec '14

10 Dec '14

Hi Christophe, I have been using boost msm, i have two state machines each with around 30 transitions / 4 regions , no submachine etc for now... it perfectly fits the bill on what im trying to do, thanks for the great library, one issue i face is ,the debug build takes for ever to compile and the size is very big (the optimized one with no debug symbol compiles pretty fast) and when errors happens the compiler (template barf) goes for pages and pages .. any hints on this please? thanks -raj

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Named semaphores in Windows Hi
by Kevin Williams 09 Dec '14

09 Dec '14

Hi I am looking at named semaphores in Windows. (Boost 1.57 with MSVC 2012) In a simple test, I create a named semaphore, and immediately do a "wait" after that, but the semaphore does not block. Am I missing something? Without a "post" surely it should block? Kind regards, Kevin

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[Boost.Test] unexpected behavior after std::system(...)
by contini.mailing＠gmail.com 09 Dec '14

09 Dec '14

Hi, I'm using boost 1.57 with gcc 4.7.2 on a debian wheezy. I'm testing an external program that has a non-zero return code and i'm experiencing an unexpected behavior of Boost.Test library. If the test below is linked statically (commenting the first line of course) everything works fine and all the three tests are executed. If the test below is linked dynamically i get the following output: test0 test1 unknown location(0): fatal error in "test1": child has exited; pid: 32314; uid: 1000; exit value: 4 (here program hangs forever and the third test is never executed) Defining the environment variable BOOST_TEST_CATCH_SYSTEM_ERRORS=No circumvents the problem. But i don't want to define it on all of the team member's computers and test machines. This can be considered a boost bug? #define BOOST_TEST_DYN_LINK #define BOOST_TEST_MODULE test_module #define BOOST_TEST_IGNORE_NON_ZERO_CHILD_CODE #include <boost/test/unit_test.hpp> #include <stdlib.h> BOOST_AUTO_TEST_CASE( test0 ) { std::system("echo \"test0\";exit 0;"); } BOOST_AUTO_TEST_CASE( test1 ) { std::system("echo \"test1\";exit 1;"); } BOOST_AUTO_TEST_CASE( test2 ) { std::system("echo \"test2\";exit 2;"); } Any help is appreciated.

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