...

, boost::spirit::parser_context<boost::spirit::nil_t> >*>::operator() (this=0xb554300c, __p=0x809aad8, __x=0xb5543134) at /opt/gcc-4.0.3/lib/gcc/i486-linux-gnu/4.0.3/../../../../include/c++/4.0. 3/bits/stl_function.h:664 664 { return (__p->*_M_f)(__x); } (gdb) bt #0 0x0804e9dc in std::mem_fun1_t<int, boost::spirit::impl::grammar_helper_base<boost::spirit::grammar<boost::p roperty_tree::xml_parser::xml_grammar<boost::property_tree::basic_ptree< boost::property_tree::ptree_traits<char> > >, boost::spirit::parser_context<boost::spirit::nil_t> > >, boost::spirit::grammar<boost::property_tree::xml_parser::xml_grammar<boo st::property_tree::basic_ptree<boost::property_tree::ptree_traits<char> , boost::spirit::parser_context<boost::spirit::nil_t> >*>::operator() (this=0xb554300c, __p=0x809aad8, __x=0xb5543134) at /opt/gcc-4.0.3/lib/gcc/i486-linux-gnu/4.0.3/../../../../include/c++/4.0. 3/bits/stl_function.h:664 #1 0x0804ea2a in std::binder2nd<std::mem_fun1_t<int, boost::spirit::impl::grammar_helper_base<boost::spirit::grammar<boost::p roperty_tree::xml_parser::xml_grammar<boost::property_tree::basic_ptree< boost::property_tree::ptree_traits<char> > >, boost::spirit::parser_context<boost::spirit::nil_t> > >, boost::spirit::grammar<boost::property_tree::xml_parser::xml_grammar<boo st::property_tree::basic_ptree<boost::property_tree::ptree_traits<char> , boost::spirit::parser_context<boost::spirit::nil_t> >*> ::operator() (this=0xb554300c, __x=@0x809bc80) at /opt/gcc-4.0.3/lib/gcc/i486-linux-gnu/4.0.3/../../../../include/c++/4.0. 3/bits/stl_function.h:446 #2 0x0804f57a in std::for_each<std::reverse_iterator<__gnu_cxx::__normal_iterator<boost:: spirit::impl::grammar_helper_base<boost::spirit::grammar<boost::property _tree::xml_parser::xml_grammar<boost::property_tree::basic_ptree<boost::

Hello, I got an segmentation fault if I create mutliple threads and each thread class a free function f() which creates an ptree from a xml stream. Because each thread calls f() it should create its own ptree xml parser - but why does the seg fault happen? Regards, Oliver Code: #include <iostream> #include <cstdlib> #include <string> #include <sstream> #include <boost/bind.hpp> #include <boost/property_tree/ptree.hpp> #include <boost/property_tree/xml_parser.hpp> #include <boost/shared_ptr.hpp> #include <boost/thread.hpp> #include <boost/thread/barrier.hpp> namespace ptr = boost::property_tree; void f() { try { std::string value = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\ <fibonnaci>\ <in>\ <number>10</number>\ <delay>1</delay>\ </in>\ </fibonnaci>"; std::stringstream as_xml( value); // printf("in data == %s\n", as_xml.str().c_str() ); ptr::ptree p; ptr::read_xml( as_xml, p); } catch ( std::exception const& e) { std::cerr << e.what() << std::endl; } catch ( ... ) { std::cerr << "unhandled" << std::endl; } } struct X { boost::barrier & b_; X( boost::barrier & b) : b_( b) {} void operator()() { b_.wait(); f(); } }; int main(int argc, char *argv[]) { try { boost::barrier b( 10); boost::thread_group tg; X x( b); tg.create_thread( boost::bind( & X::operator(), x) ); tg.create_thread( boost::bind( & X::operator(), x) ); tg.create_thread( boost::bind( & X::operator(), x) ); tg.create_thread( boost::bind( & X::operator(), x) ); tg.create_thread( boost::bind( & X::operator(), x) ); tg.create_thread( boost::bind( & X::operator(), x) ); tg.create_thread( boost::bind( & X::operator(), x) ); tg.create_thread( boost::bind( & X::operator(), x) ); tg.create_thread( boost::bind( & X::operator(), x) ); tg.create_thread( boost::bind( & X::operator(), x) ); tg.join_all(); } catch ( std::exception const& e) { std::cerr << e.what() << std::endl; } catch ( ... ) { std::cerr << "unhandled" << std::endl; } } DGB: Program terminated with signal 11, Segmentation fault. #0 0x0804e9dc in std::mem_fun1_t<int, boost::spirit::impl::grammar_helper_base<boost::spirit::grammar<boost::p roperty_tree::xml_parser::xml_grammar<boost::property_tree::basic_ptree< boost::property_tree::ptree_traits<char> > >, boost::spirit::parser_context<boost::spirit::nil_t> > >, boost::spirit::grammar<boost::property_tree::xml_parser::xml_grammar<boo st::property_tree::basic_ptree<boost::property_tree::ptree_traits<char> property_tree::ptree_traits<char> > >, boost::spirit::parser_context<boost::spirit::nil_t> > >**, std::vector<boost::spirit::impl::grammar_helper_base<boost::spirit::gram mar<boost::property_tree::xml_parser::xml_grammar<boost::property_tree:: basic_ptree<boost::property_tree::ptree_traits<char> > >, boost::spirit::parser_context<boost::spirit::nil_t> > >*, std::allocator<boost::spirit::impl::grammar_helper_base<boost::spirit::g rammar<boost::property_tree::xml_parser::xml_grammar<boost::property_tre e::basic_ptree<boost::property_tree::ptree_traits<char> > >, boost::spirit::parser_context<boost::spirit::nil_t> > >*> > > >, std::binder2nd<std::mem_fun1_t<int, boost::spirit::impl::grammar_helper_base<boost::spirit::grammar<boost::p roperty_tree::xml_parser::xml_grammar<boost::property_tree::basic_ptree< boost::property_tree::ptree_traits<char> > >, boost::spirit::parser_context<boost::spirit::nil_t> > >, boost::spirit::grammar<boost::property_tree::xml_parser::xml_grammar<boo st::property_tree::basic_ptree<boost::property_tree::ptree_traits<char>

...

, boost::spirit::parser_context<boost::spirit::nil_t> >*> > > (__first=@0xb5543088, __last=@0xb5543084, __f=

*,boost::spirit::grammar<boost::property_tree::xml_parser::xml_grammar< boost::property_tree::basic_ptree<boost::property_tree::ptree_traits<cha r> > >, boost::spirit::parser_context<boost::spirit::nil_t> >*,int>> = {<No data fields>}, _M_f = {__pfn = 0x1, __delta = 0}}, value = 0xb5543134}) at /opt/gcc-4.0.3/lib/gcc/i486-linux-gnu/4.0.3/../../../../include/c++/4.0. 3/bits/stl_algo.h:158 #3 0x0804f68f in boost::spirit::impl::grammar_destruct<boost::spirit::grammar<boost::prop erty_tree::xml_parser::xml_grammar<boost::property_tree::basic_ptree<boo st::property_tree::ptree_traits<char> > >, boost::spirit::parser_context<boost::spirit::nil_t> > > ( self=0xb5543134) at /opt/boost/include/boost-1_34/boost/spirit/core/non_terminal/impl/gramma r.ipp:307 #4 0x080613de in ~grammar (this=0xb5543134) at /opt/boost/include/boost-1_34/boost/spirit/core/non_terminal/grammar.hpp :50 #5 0x0806148b in ~xml_grammar (this=0xb5543134) at /opt/boost/include/boost-1_34/boost/property_tree/detail/xml_parser_read _spirit.hpp:132 #6 0x0806cc59 in boost::property_tree::xml_parser::read_xml_internal<boost::property_tree ::basic_ptree<boost::property_tree::ptree_traits<char> > > (stream=@0xb5543274, pt=@0xb5543330, flags=0, filename=@0xb5543240) at /opt/boost/include/boost-1_34/boost/property_tree/detail/xml_parser_read _spirit.hpp:724 #7 0x0806cd9e in boost::property_tree::xml_parser::read_xml<boost::property_tree::basic_p

{<std::unary_function<boost::spirit::impl::grammar_helper_base<boost::sp irit::grammar<boost::property_tree::xml_parser::xml_grammar<boost::prope rty_tree::basic_ptree<boost::property_tree::ptree_traits<char> > >, boost::spirit::parser_context<boost::spirit::nil_t> > >*,int>> = {<No data fields>}, op = {<std::binary_function<boost::spirit::impl::grammar_helper_base<boost::s pirit::grammar<boost::property_tree::xml_parser::xml_grammar<boost::prop erty_tree::basic_ptree<boost::property_tree::ptree_traits<char> > >, boost::spirit::parser_context<boost::spirit::nil_t> > tree<boost::property_tree::ptree_traits<char> > > (stream=@0xb5543274, pt=@0xb5543330, flags=0) at /opt/boost/include/boost-1_34/boost/property_tree/xml_parser.hpp:38 #8 0x0804ae6e in f () at /home/kowalke/Projects/test_ptree/src/test_ptree.cpp:29 #9 0x0806cde8 in X::operator() (this=0xb5543448) at /home/kowalke/Projects/test_ptree/src/test_ptree.cpp:48 #10 0x0804f79e in boost::_mfi::mf0<void, X>::operator() (this=0xb5543440, t=@0xb5543448) at /opt/boost/include/boost-1_34/boost/bind/mem_fn_template.hpp:68 #11 0x0805179e in boost::_bi::list1<boost::_bi::value<X>

::operator()<boost::_mfi::mf0<void, X>, boost::_bi::list0> (this=0xb5543448, f=@0xb5543440, a=@0xb55433b6) at /opt/boost/include/boost-1_34/boost/bind.hpp:231 #12 0x080517e1 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, X>, boost::_bi::list1<boost::_bi::value<X> > >::operator() ( this=0xb5543440) at /opt/boost/include/boost-1_34/boost/bind/bind_template.hpp:20 #13 0x080517fb in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<v oid, boost::_mfi::mf0<void, X>, boost::_bi::list1<boost::_bi::value<X> > , void>::invoke (function_obj_ptr=@0xb5543440) at /opt/boost/include/boost-1_34/boost/function/function_template.hpp:155 #14 0xb7fad10c in boost::function0<void, std::allocator<boost::function_base> >::operator() () from /opt/boost/lib/libboost_thread-gcc40-mt-1_34.so.1.34.0 #15 0xb7fad061 in boost::thread_group::create_thread () from /opt/boost/lib/libboost_thread-gcc40-mt-1_34.so.1.34.0 #16 0xb7d4f240 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0 #17 0xb7e313de in clone () from /lib/tls/i686/cmov/libc.so.6