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Re: [boost] boost::shared_ptr<>::compare_and_swap()--AmIinsaneforwanting this?
by Talbot, George 10 Nov '06

10 Nov '06

Wow...this is great! I think I may try to code up a wrapper that privately inherits from shared_ptr and just provides the spinlock around the operations, as a proof-of-concept. I'm doing this on Linux on x86 right now (32-bit). Should I use this spinlock implementation: http://en.wikipedia.org/wiki/Spinlock Or is there a better one? What would be a good name for the wrapper, do you think? -- George T. Talbot <gtalbot(a)locuspharma.com> > -----Original Message----- > From: boost-bounces(a)lists.boost.org [mailto:boost-bounces@lists.boost.org] > On Behalf Of Peter Dimov > Sent: Friday, November 10, 2006 12:28 PM > To: boost(a)lists.boost.org > Subject: Re: [boost]boost::shared_ptr<>::compare_and_swap()-- > AmIinsaneforwanting this? > > Talbot, George wrote: > > > So that seems like a bit of a useless guarantee--basically any > > structure constructed with shared_ptr can only be read by the same > > thread that's writing to the structure unless all of the pointer > > operations are guarded with a mutex or spinlock, right? > > Or an rwlock. > > Correct, the guarantee isn't useful for writing lock-free code. > > > Ignoring compare-and-swap, have you or anyone else experimented with > > using a spinlock (as you mentioned previously) to remove the above > > restriction? What would that do to performance and complexity? Could > > you use a compare-and-swap type of operation to implement read/write > > thread safety? > > The atomic operations would look like: > > shared_ptr copy( shared_ptr const & p ) > > lock spinlock for p > shared_ptr r = p; > unlock spinlock for p > return r > > void replace( shared_ptr & p, shared_ptr q ) > > lock spinlock for p > p.swap( q ); > unlock spinlock for p > > bool compare_and_swap( shared_ptr & p, shared_ptr const & cmp, shared_ptr > xchg ) > > lock spinlock for p > bool r = p == cmp; > if( r ) p.swap( xchg ); > unlock spinlock for p > return r; > > The critical regions are comfortably short, so using a spinlock seems > justified. One problem is that shared_ptr doesn't have space for a > spinlock, > so we'd need to use a hashed spinlock pool keyed on 'this'. Or it might be > possible to reuse the pointer as a spinlock, using something like (void*)- > 1 > as the 'locked' state. I haven't prototyped it, but it seems workable. > > _______________________________________________ > Unsubscribe & other changes: > http://lists.boost.org/mailman/listinfo.cgi/boost

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[Boost-bugs] [ boost-Bugs-1594324 ] program_options find assert fails with multibyte characters
by SourceForge.net 10 Nov '06

10 Nov '06

Bugs item #1594324, was opened at 2006-11-10 09:56 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1594324&group_… Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: program_options find assert fails with multibyte characters Initial Comment: I have experienced the following error when running my application. Assertion failed: n == name.size()-2, file C:\....\Libraries\OpenSource\boost\libs\program_options\build\../src/options_description.cpp, line 118 It is compiled in VC++ 2005. Using the debugger I was able to determine that std::find was returning double the expected value for the position of the comma. So for the option: "help,h" find set n = 8, instead of 4. I am using multibyte characters in the application. The problem only occurs when I compile my application in debug mode. The release version runs without any problem. Cheer, Brian! ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1594324&group_… ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Boost-bugs mailing list Boost-bugs(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs

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[gil] Indexed Images
by Christian Henning 10 Nov '06

10 Nov '06

Hi there, I'm playing around with indexed images in GIL. My starting point was an email from Lubomir during the review. Here is what I have: struct indexed_pixel_deref_fn { typedef pixel_traits<rgb8_pixel_t>::reference reference; typedef pixel_traits<rgb8_pixel_t>::const_reference const_reference; typedef const_reference const_t; typedef reference result_type; typedef rgb8_pixel_t value_type; static const bool is_mutable = false; indexed_pixel_deref_fn( rgb8_pixel_t* table ) : _table( table ) {} rgb8_pixel_t operator()( const gray8_pixel_t& index ) const { return _table[index[0]]; } rgb8_pixel_t* _table; }; typedef gray8_view_t::add_deref<indexed_pixel_deref_fn> indexed_factory_t; typedef indexed_factory_t::type rgb8_indexed_view_t; int _tmain(int argc, _TCHAR* argv[]) { // create color lookup table rgb8_pixel_t rgb_black( 0, 0, 0 ); rgb8_pixel_t rgb_red( 255, 0, 0 ); rgb8_pixel_t my_index_table[2]; my_index_table[0] = rgb_red; my_index_table[1] = rgb_black; // create indexed image gray8_image_t indexed_img( 10,10 ); fill_pixels( view( indexed_img ), unsigned char( 0 ) ); rgb8_indexed_view_t indexed_view= indexed_factory_t::make( view( indexed_img ) , indexed_pixel_deref_fn( &my_index_table[0] )); // color convert the indexed image into an rgb8 image rgb8_image_t rgb_img( indexed_img.dimensions() ); copy_pixels( color_converted_view<rgb8_pixel_t>( view( indexed_img )) , view( rgb_img ) ); // save image - it should be all red jpeg_write_view( "test.jpg", const_view( rgb_img )); return 0; } I'm not sure if all these typedefs in the deref functor class are correct. Esspecially, I don't know what the const_t is for. So, my problem is the operator() in my deref isn't called at all. That shows me there is something wrong. Anyone, any idea why? Thanks, Christian

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Boost inspection notification (2006-11-10/RC_1_34_0) *X*
by Rene Rivera 10 Nov '06

10 Nov '06

Boost Inspection Report Run Date: 17:06:40 UTC, Friday 10 November 2006 An inspection program <http://www.boost.org/tools/inspect/index.html> checks each file in the current Boost CVS for various problems, generating this as output. Problems detected include tabs in files, missing copyrights, broken URL's, and similar misdemeanors. Totals: 11422 files scanned 891 directories scanned (including root) 243 problems reported Problem counts: 0 files with invalid line endings 0 bookmarks with invalid characters 3 invalid urls 176 broken links 21 unlinked files 7 file/directory names issues 1 files with tabs 0 violations of the Boost min/max guidelines 35 usages of unnamed namespaces in headers (including .ipp files) Summary: archive (3) bind (1) boost-root (1) build (2) date_time (1) doc (2) filesystem (37) fusion (1) graph (3) inspect (1) interprocess (1) iostreams (4) lambda (4) more (66) mpl (1) multi_array (2) numeric (1) parameter (2) program_options (1) ptr_container (1) python (7) regex (1) regression (14) serialization (1) signals (1) test (81) tuple (1) type_traits (1) utility (1) Details: *R* invalid (cr only) line-ending *A* invalid bookmarks, invalid urls, broken links, unlinked files *N* file/directory names issues *T* tabs in file *M* uses of min or max that have not been protected from the min/max macros, or unallowed #undef-s *U* unnamed namespace in header |archive| boost/archive/basic_streambuf_locale_saver.hpp: *N* name exceeds 31 characters boost/archive/impl/xml_wiarchive_impl.ipp: *U* unnamed namespace at line 53 boost/archive/iterators/remove_whitespace.hpp: *U* unnamed namespace at line 57 |bind| boost/bind/placeholders.hpp: *U* unnamed namespace at line 25 |boost-root| index.htm: *A* broken link: ../doc/html/signals.html |build| tools/build/v2/example/make/main.cpp.pro: *N* name contains more than one dot character ('.') tools/build/v2/test/test_system.html: *A* unlinked file |date_time| libs/date_time/xmldoc/date_time_docs_howto.html: *A* unlinked file |doc| doc/html/boost_math/inverse_complex.html: *A* unlinked file doc/html/jam.html: *A* unlinked file |filesystem| libs/filesystem/doc/do-list.htm: *A* invalid URL (hardwired file): file://?/ *A* invalid URL (hardwired file): file://?/UNC/ libs/filesystem/doc/i18n.html: *A* broken link: convenience.htm#basic_recursive_directory_iterator *A* broken link: exception.htm *A* broken link: operations.htm *A* broken link: operations.htm#Do-the-right-thing *A* broken link: operations.htm#is_directory *A* broken link: operations.htm#is_file *A* broken link: operations.htm#status libs/filesystem/doc/index.htm: *A* broken link: ../build/Jamfile *A* broken link: convenience.htm *A* broken link: fstream.htm *A* broken link: operations.htm#create_directory *A* broken link: operations.htm#create_hard_link *A* broken link: operations.htm#current_path *A* broken link: operations.htm#directory_iterator *A* broken link: operations.htm#equivalent *A* broken link: operations.htm#file_size *A* broken link: operations.htm#initial_path *A* broken link: operations.htm#is_file *A* broken link: operations.htm#is_symlink *A* broken link: operations.htm#status *A* broken link: operations.htm#symlink_status *A* broken link: path.htm#Canonical *A* broken link: path.htm#Grammar *A* broken link: path.htm#Normalized *A* broken link: path.htm#default_name_check *A* broken link: path.htm#name_check_mechanism *A* broken link: path.htm#normalize *A* broken link: path.htm#operator_eq *A* broken link: path.htm#synopsis libs/filesystem/doc/portability_guide.htm: *A* broken link: path.htm#name_check_typedef libs/filesystem/doc/tr2_proposal.html: *A* invalid URL (hardwired file): file:///C|/boost/site/libs/filesystem/doc/operations.htm#complete_note |fusion| libs/fusion/index.html: *A* broken link: doc/html/index.html |graph| boost/graph/maximum_cardinality_matching.hpp: *N* name exceeds 31 characters libs/graph/doc/lengauer_tarjan_dominator_tree.htm: *N* name exceeds 31 characters libs/graph/doc/sorted_erdos_renyi_generator.html: *N* name exceeds 31 characters |inspect| tools/inspect/index.html: *A* broken link: build/Jamfile |interprocess| libs/interprocess/index.html: *A* broken link: doc/html/index.html |iostreams| libs/iostreams/doc/acknowledgments.html: *A* unlinked file libs/iostreams/doc/concepts/multi-character.html: *A* unlinked file libs/iostreams/doc/installation.html: *A* broken link: ../../../tools/build/v1/build_system.htm |lambda| boost/lambda/core.hpp: *U* unnamed namespace at line 62 boost/lambda/detail/lambda_functors.hpp: *U* unnamed namespace at line 25 boost/lambda/exceptions.hpp: *U* unnamed namespace at line 24 libs/lambda/doc/index.html: *A* broken link: ../../LICENSE_1_0.txt |more| more/getting_started.html: *A* broken link: ../Jamfile *A* broken link: ../tools/build/v1/borland-tools.html *A* broken link: ../tools/build/v1/build_system.htm *A* broken link: ../tools/build/v1/build_system.htm#build *A* broken link: ../tools/build/v1/como-tools.html *A* broken link: ../tools/build/v1/cw-tools.html *A* broken link: ../tools/build/v1/darwin-tools.html *A* broken link: ../tools/build/v1/dmc-stlport-tools.html *A* broken link: ../tools/build/v1/dmc-tools.html *A* broken link: ../tools/build/v1/edg-tools.html *A* broken link: 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Boost regression notification (2006-11-10 [RC_1_34_0])
by Douglas Gregor 10 Nov '06

10 Nov '06

Boost Regression test failures Report time: 2006-11-10T12:50:37Z This report lists all regression test failures on release platforms. Detailed report: http://engineering.meta-comm.com/boost-regression/CVS-RC_1_34_0/developer/i… The following platforms have a large number of failures: borland-5.8.2 937 failures in 46 libraries (241 are from non-broken platforms) algorithm/minmax (1 of 4 failures are from non-broken platforms) algorithm/string (6 of 19 failures are from non-broken platforms) any (0 of 1 failures are from non-broken platforms) array (0 of 6 failures are from non-broken platforms) bind (0 of 19 failures are from non-broken platforms) config (0 of 3 failures are from non-broken platforms) conversion (0 of 3 failures are from non-broken platforms) date_time (39 of 129 failures are from non-broken platforms) disjoint_sets (1 of 3 failures are from non-broken platforms) dynamic_bitset (0 of 4 failures are from non-broken platforms) filesystem (6 of 18 failures are from non-broken platforms) foreach (1 of 14 failures are from non-broken platforms) function (0 of 8 failures are from non-broken platforms) functional (0 of 1 failures are from non-broken platforms) functional/hash (0 of 24 failures are from non-broken platforms) graph (2) integer (0 of 2 failures are from non-broken platforms) iostreams (35 of 91 failures are from non-broken platforms) iterator (13 of 40 failures are from non-broken platforms) logic (0 of 3 failures are from non-broken platforms) math (0 of 8 failures are from non-broken platforms) mpl (54 of 165 failures are from non-broken platforms) numeric/conversion (0 of 1 failures are from non-broken platforms) numeric/interval (0 of 5 failures are from non-broken platforms) optional (0 of 5 failures are from non-broken platforms) parameter (17 of 41 failures are from non-broken platforms) program_options (7) property_map (0 of 1 failures are from non-broken platforms) random (2 of 4 failures are from non-broken platforms) range (8 of 24 failures are from non-broken platforms) rational (1 of 4 failures are from non-broken platforms) regex (0 of 34 failures are from non-broken platforms) serialization (17 of 45 failures are from non-broken platforms) signals (5 of 15 failures are from non-broken platforms) smart_ptr (0 of 11 failures are from non-broken platforms) spirit (1) statechart (4) static_assert (0 of 2 failures are from non-broken platforms) test (3 of 11 failures are from non-broken platforms) thread (0 of 1 failures are from non-broken platforms) tokenizer (6 of 18 failures are from non-broken platforms) tr1 (0 of 49 failures are from non-broken platforms) type_traits (0 of 50 failures are from non-broken platforms) utility (2 of 11 failures are from non-broken platforms) variant (8 of 24 failures are from non-broken platforms) xpressive (2) Test failures marked with a (*) represent tests that failed on platforms that are considered broken. They are likely caused by misconfiguration by the regression tester or a failure in a core library such as Test or Config. |algorithm/minmax| minmax: borland-5.8.2* minmax_element: borland-5.6.4 borland-5.8.2* borland-5.8.2* |algorithm/string| conv: borland-5.6.4 borland-5.8.2* borland-5.8.2* find: borland-5.6.4 borland-5.8.2* borland-5.8.2* join: borland-5.6.4 borland-5.8.2* borland-5.8.2* predicate: borland-5.6.4 borland-5.8.2* borland-5.8.2* replace: borland-5.6.4 borland-5.8.2* borland-5.8.2* split: borland-5.6.4 borland-5.8.2* borland-5.8.2* trim: borland-5.8.2* |any| any_test: borland-5.8.2* |array| array0: borland-5.8.2* array1: borland-5.8.2* array2: borland-5.8.2* array3: borland-5.8.2* array4: borland-5.8.2* array5: borland-5.8.2* |bind| bind_const_test: borland-5.8.2* bind_cv_test: borland-5.8.2* bind_dm2_test: borland-5.8.2* bind_dm_test: borland-5.8.2* bind_eq_test: borland-5.8.2* bind_function_test: borland-5.8.2* bind_lookup_problem_test: borland-5.8.2* bind_not_test: borland-5.8.2* bind_rel_test: borland-5.8.2* bind_rv_sp_test: borland-5.8.2* bind_stateful_test: borland-5.8.2* bind_test: borland-5.8.2* bind_visit_test: borland-5.8.2* mem_fn_derived_test: borland-5.8.2* mem_fn_dm_test: borland-5.8.2* mem_fn_eq_test: borland-5.8.2* mem_fn_rv_test: borland-5.8.2* mem_fn_test: borland-5.8.2* mem_fn_void_test: borland-5.8.2* |config| abi_test: borland-5.8.2* config_info: borland-5.8.2* config_link_test: borland-5.8.2* |conversion| cast_test: borland-5.8.2* implicit_cast: borland-5.8.2* numeric_cast_test: borland-5.8.2* |date_time| testc_local_adjustor: borland-5.6.4 borland-5.8.2* borland-5.8.2* testclock: borland-5.6.4 borland-5.8.2* borland-5.8.2* testconstrained_value: borland-5.8.2* testcustom_time_zone: borland-5.8.2* borland-5.8.2* testdate: borland-5.6.4 borland-5.8.2* borland-5.8.2* testdate_dll: borland-5.6.4 borland-5.8.2* borland-5.8.2* testdate_duration: borland-5.6.4 borland-5.8.2* borland-5.8.2* testdate_duration_dll: borland-5.6.4 borland-5.8.2* borland-5.8.2* testdate_input_facet: borland-5.6.4 borland-5.8.2* borland-5.8.2* testdate_input_facet_dll: borland-5.6.4 borland-5.8.2* borland-5.8.2* testdate_iterator: borland-5.6.4 borland-5.8.2* borland-5.8.2* testdate_iterator_dll: borland-5.6.4 borland-5.8.2* borland-5.8.2* testdst_rules: borland-5.6.4 borland-5.8.2* borland-5.8.2* testdst_transition_day_rule: borland-5.6.4 borland-5.8.2* borland-5.8.2* testduration: borland-5.6.4 borland-5.8.2* borland-5.8.2* testfiletime_functions: borland-5.6.4 borland-5.8.2* borland-5.8.2* testformatters: borland-5.6.4 borland-5.8.2* borland-5.8.2* testformatters_dll: borland-5.6.4 borland-5.8.2* borland-5.8.2* testgenerators: borland-5.6.4 borland-5.8.2* borland-5.8.2* testgenerators_dll: borland-5.6.4 borland-5.8.2* borland-5.8.2* testgeneric_period: borland-5.8.2* testgreg_duration_operators: borland-5.6.4 borland-5.8.2* borland-5.8.2* testgreg_durations: borland-5.6.4 borland-5.8.2* borland-5.8.2* testgreg_durations_dll: borland-5.6.4 borland-5.8.2* borland-5.8.2* testgreg_serialize: borland-5.6.4 borland-5.8.2* borland-5.8.2* testgreg_serialize_dll: borland-5.6.4 borland-5.8.2* borland-5.8.2* testgreg_serialize_xml: borland-5.6.4 borland-5.8.2* borland-5.8.2* testgregorian_calendar: borland-5.8.2* testint_adapter: borland-5.8.2* testiterator: borland-5.6.4 borland-5.8.2* borland-5.8.2* testlocal_adjustor: borland-5.6.4 borland-5.8.2* borland-5.8.2* testmicrosec_time_clock: borland-5.6.4 borland-5.8.2* borland-5.8.2* testparse_time: borland-5.6.4 borland-5.8.2* borland-5.8.2* testperiod: borland-5.6.4 borland-5.8.2* borland-5.8.2* testperiod_dll: borland-5.6.4 borland-5.8.2* borland-5.8.2* testposix_time_zone: borland-5.8.2* borland-5.8.2* testtime: borland-5.6.4 borland-5.8.2* borland-5.8.2* testtime_formatters: borland-5.6.4 borland-5.8.2* borland-5.8.2* testtime_period: borland-5.6.4 borland-5.8.2* borland-5.8.2* testtime_resolution_traits: borland-5.8.2* testtime_serialize: borland-5.6.4 borland-5.8.2* borland-5.8.2* testtime_serialize_std_config: borland-5.6.4 borland-5.8.2* borland-5.8.2* testtime_serialize_xml: borland-5.6.4 borland-5.8.2* borland-5.8.2* testtime_serialize_xml_std_config: borland-5.6.4 borland-5.8.2* borland-5.8.2* testtz_database: borland-5.8.2* borland-5.8.2* testwcustom_time_zone: borland-5.6.4 borland-5.8.2* borland-5.8.2* testwposix_time_zone: borland-5.6.4 borland-5.8.2* borland-5.8.2* testwrapping_int: borland-5.8.2* |disjoint_sets| disjoint_set_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* |dynamic_bitset| dyn_bitset_unit_tests1: borland-5.8.2* dyn_bitset_unit_tests2: borland-5.8.2* dyn_bitset_unit_tests3: borland-5.8.2* dyn_bitset_unit_tests4: borland-5.8.2* |filesystem| convenience_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* fstream_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* large_file_support_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* operations_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* path_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* simple_ls: borland-5.6.4 borland-5.8.2* borland-5.8.2* |foreach| array_byref: borland-5.8.2* array_byval: borland-5.8.2* call_once: borland-5.8.2* cstr_byref: borland-5.8.2* cstr_byval: borland-5.8.2* dependent_type: borland-5.8.2* noncopyable: borland-5.6.4 borland-5.8.2* borland-5.8.2* pair_byref: borland-5.8.2* pair_byval: borland-5.8.2* stl_byref: borland-5.8.2* stl_byval: borland-5.8.2* user_defined: borland-5.8.2* |function| contains2_test: borland-5.8.2* contains_test: borland-5.8.2* function_arith_portable: borland-5.8.2* function_n_test: borland-5.8.2* function_ref_portable: borland-5.8.2* mem_fun_portable: borland-5.8.2* std_bind_portable: borland-5.8.2* sum_avg_portable: borland-5.8.2* |functional| function_test: borland-5.8.2* |functional/hash| books: borland-5.8.2* container_fwd_test: borland-5.8.2* hash_built_in_array_test: borland-5.8.2* hash_custom_test: borland-5.8.2* hash_deque_test: borland-5.8.2* hash_float_test: borland-5.8.2* hash_friend_test: borland-5.8.2* hash_function_pointer_test: borland-5.8.2* hash_fwd_test_1: borland-5.8.2* hash_fwd_test_2: borland-5.8.2* hash_list_test: borland-5.8.2* hash_map_test: borland-5.8.2* hash_no_ext_macro_1: borland-5.8.2* hash_no_ext_macro_2: borland-5.8.2* hash_number_test: borland-5.8.2* hash_pointer_test: borland-5.8.2* hash_range_test: borland-5.8.2* hash_set_test: borland-5.8.2* hash_string_test: borland-5.8.2* hash_value_array_test: borland-5.8.2* hash_vector_test: borland-5.8.2* link_ext_test: borland-5.8.2* link_test: borland-5.8.2* portable: borland-5.8.2* |graph| adj_list_cc: qcc-3.3.5_gpp king_ordering: gcc-3.4.5_linux |integer| cstdint_test: borland-5.8.2* integer_test: borland-5.8.2* |iostreams| array_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* auto_close_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* buffer_size_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* bzip2_test: msvc-7.1 msvc-8.0 code_converter_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* component_access_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* compose_test: borland-5.8.2* borland-5.8.2* copy_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* counter_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* direct_adapter_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* example_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* file_descriptor_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* cw-9.4 file_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* filtering_stream_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* finite_state_filter_test: cw-9.4 flush_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* gzip_test: msvc-7.1 msvc-8.0 invert_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* line_filter_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* mapped_file_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* cw-9.4 newline_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* null_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* pipeline_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* regex_filter_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* restrict_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* seekable_file_test: borland-5.8.2* borland-5.8.2* seekable_filter_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* stdio_filter_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* symmetric_filter_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* tee_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* wide_stream_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* zlib_test: msvc-7.1 msvc-8.0 |iterator| concept_tests: borland-5.6.4 borland-5.8.2* borland-5.8.2* counting_iterator_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* filter_iterator_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* indirect_iterator_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* interoperable: borland-5.6.4 borland-5.8.2* borland-5.8.2* iterator_adaptor_cc: borland-5.6.4 borland-5.8.2* borland-5.8.2* iterator_adaptor_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* iterator_archetype_cc: borland-5.6.4 borland-5.8.2* borland-5.8.2* iterator_facade: borland-5.6.4 borland-5.8.2* borland-5.8.2* iterator_traits_test: borland-5.8.2* permutation_iterator_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* reverse_iterator_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* transform_iterator_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* unit_tests: borland-5.6.4 borland-5.8.2* borland-5.8.2* |logic| tribool_io_test: borland-5.8.2* tribool_rename_test: borland-5.8.2* tribool_test: borland-5.8.2* |math| octonion_test: borland-5.8.2* borland-5.8.2* quaternion_mult_incl_test: borland-5.8.2* borland-5.8.2* quaternion_test: borland-5.8.2* borland-5.8.2* special_functions_test: borland-5.8.2* borland-5.8.2* |mpl| always: borland-5.6.4 borland-5.8.2* borland-5.8.2* apply_wrap: borland-5.8.2* borland-5.8.2* bind: borland-5.6.4 borland-5.8.2* borland-5.8.2* bool: borland-5.8.2* contains: borland-5.6.4 borland-5.8.2* borland-5.8.2* copy: borland-5.6.4 borland-5.8.2* borland-5.8.2* copy_if: borland-5.6.4 borland-5.8.2* borland-5.8.2* count: borland-5.6.4 borland-5.8.2* borland-5.8.2* count_if: borland-5.6.4 borland-5.8.2* borland-5.8.2* deque: borland-5.6.4 borland-5.8.2* borland-5.8.2* distance: borland-5.6.4 borland-5.8.2* borland-5.8.2* equal: borland-5.6.4 borland-5.8.2* borland-5.8.2* erase: borland-5.6.4 borland-5.8.2* borland-5.8.2* erase_range: borland-5.6.4 borland-5.8.2* borland-5.8.2* filter_view: borland-5.6.4 borland-5.8.2* borland-5.8.2* find: borland-5.6.4 borland-5.8.2* borland-5.8.2* find_if: borland-5.6.4 borland-5.8.2* borland-5.8.2* fold: borland-5.6.4 borland-5.8.2* borland-5.8.2* for_each: borland-5.6.4 borland-5.8.2* borland-5.8.2* identity: borland-5.6.4 borland-5.8.2* borland-5.8.2* index_of: borland-5.6.4 borland-5.8.2* borland-5.8.2* insert: borland-5.6.4 borland-5.8.2* borland-5.8.2* insert_range: borland-5.6.4 borland-5.8.2* borland-5.8.2* int: borland-5.8.2* borland-5.8.2* integral_c: borland-5.8.2* borland-5.8.2* is_placeholder: borland-5.6.4 borland-5.8.2* borland-5.8.2* joint_view: borland-5.6.4 borland-5.8.2* borland-5.8.2* lambda: borland-5.6.4 borland-5.8.2* borland-5.8.2* lambda_args: borland-5.6.4 borland-5.8.2* borland-5.8.2* list: borland-5.6.4 borland-5.8.2* borland-5.8.2* list_c: borland-5.6.4 borland-5.8.2* borland-5.8.2* lower_bound: borland-5.6.4 borland-5.8.2* borland-5.8.2* max_element: borland-5.6.4 borland-5.8.2* borland-5.8.2* multiset: gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 pair_view: borland-5.6.4 borland-5.8.2* borland-5.8.2* partition: borland-5.6.4 borland-5.8.2* borland-5.8.2* pop_front: borland-5.6.4 borland-5.8.2* borland-5.8.2* push_front: borland-5.6.4 borland-5.8.2* borland-5.8.2* range_c: borland-5.6.4 borland-5.8.2* borland-5.8.2* remove: borland-5.6.4 borland-5.8.2* borland-5.8.2* remove_if: borland-5.6.4 borland-5.8.2* borland-5.8.2* replace: borland-5.6.4 borland-5.8.2* borland-5.8.2* replace_if: borland-5.6.4 borland-5.8.2* borland-5.8.2* reverse: borland-5.6.4 borland-5.8.2* borland-5.8.2* same_as: borland-5.6.4 borland-5.8.2* borland-5.8.2* single_view: borland-5.6.4 borland-5.8.2* borland-5.8.2* size: borland-5.6.4 borland-5.8.2* borland-5.8.2* size_t: borland-5.8.2* borland-5.8.2* sort: borland-5.6.4 borland-5.8.2* borland-5.8.2* stable_partition: borland-5.6.4 borland-5.8.2* borland-5.8.2* transform: borland-5.6.4 borland-5.8.2* borland-5.8.2* transform_view: borland-5.6.4 borland-5.8.2* borland-5.8.2* unique: borland-5.6.4 borland-5.8.2* borland-5.8.2* unpack_args: borland-5.6.4 borland-5.8.2* borland-5.8.2* upper_bound: borland-5.6.4 borland-5.8.2* borland-5.8.2* vector: borland-5.6.4 borland-5.8.2* borland-5.8.2* vector_c: borland-5.6.4 borland-5.8.2* borland-5.8.2* |numeric/conversion| numeric_cast_test: borland-5.8.2* |numeric/interval| add: borland-5.8.2* fmod: borland-5.8.2* mul: borland-5.8.2* pi: borland-5.8.2* pow: borland-5.8.2* |optional| optional_test: borland-5.8.2* optional_test_inplace: borland-5.8.2* optional_test_io: borland-5.8.2* optional_test_ref: borland-5.8.2* optional_test_tie: borland-5.8.2* |parameter| basics: borland-5.6.4 borland-5.8.2* borland-5.8.2* compose: borland-5.6.4 borland-5.8.2* borland-5.8.2* deduced: borland-5.6.4 borland-5.8.2* borland-5.8.2* deduced_dependent_predicate: borland-5.6.4 borland-5.8.2* borland-5.8.2* duplicates: gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 gcc-4.1.1_sunos_i86pc earwicker: borland-5.6.4 borland-5.8.2* borland-5.8.2* efficiency: borland-5.6.4 borland-5.8.2* borland-5.8.2* macros: borland-5.6.4 borland-5.8.2* borland-5.8.2* mpl: borland-5.6.4 borland-5.8.2* borland-5.8.2* ntp: borland-5.6.4 borland-5.8.2* borland-5.8.2* preprocessor: borland-5.6.4 borland-5.8.2* borland-5.8.2* sfinae: borland-5.6.4 singular: borland-5.6.4 borland-5.8.2* borland-5.8.2* tutorial: borland-5.6.4 borland-5.8.2* borland-5.8.2* |program_options| cmdline_test_dll: cw-9.4 options_description_test_dll: cw-9.4 parsers_test_dll: cw-9.4 positional_options_test_dll: cw-9.4 unicode_test_dll: cw-9.4 variable_map_test_dll: cw-9.4 winmain_dll: cw-9.4 |property_map| dynamic_properties_test: borland-5.8.2* |random| random_demo: borland-5.6.4 borland-5.8.2* borland-5.8.2* random_test: intel-linux-9.0 |range| algorithm_example: borland-5.6.4 borland-5.8.2* borland-5.8.2* const_ranges: borland-5.6.4 borland-5.8.2* borland-5.8.2* extension_mechanism: borland-5.6.4 borland-5.8.2* borland-5.8.2* iterator_pair: borland-5.6.4 borland-5.8.2* borland-5.8.2* iterator_range: borland-5.6.4 borland-5.8.2* borland-5.8.2* reversible_range: borland-5.6.4 borland-5.8.2* borland-5.8.2* std_container: borland-5.6.4 borland-5.8.2* borland-5.8.2* sub_range: borland-5.6.4 borland-5.8.2* borland-5.8.2* |rational| rational_example: borland-5.8.2* rational_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* |regex| bad_expression_test: borland-5.8.2* captures_example: borland-5.8.2* captures_test: borland-5.8.2* credit_card_example: borland-5.8.2* icu_example: borland-5.8.2* mfc_example: borland-5.8.2* object_cache_test: borland-5.8.2* partial_regex_grep: borland-5.8.2* partial_regex_match: borland-5.8.2* posix_api_check: borland-5.8.2* posix_api_check_cpp: borland-5.8.2* recursion_test: borland-5.8.2* regex_dll_config_info: borland-5.8.2* regex_grep_example_1: borland-5.8.2* regex_grep_example_2: borland-5.8.2* regex_grep_example_3: borland-5.8.2* regex_grep_example_4: borland-5.8.2* regex_iterator_example: borland-5.8.2* regex_match_example: borland-5.8.2* regex_merge_example: borland-5.8.2* regex_regress_dll: borland-5.8.2* regex_regress_threaded: borland-5.8.2* regex_replace_example: borland-5.8.2* regex_search_example: borland-5.8.2* regex_split_example_1: borland-5.8.2* regex_split_example_2: borland-5.8.2* regex_timer: borland-5.8.2* regex_token_iterator_eg_1: borland-5.8.2* regex_token_iterator_eg_2: borland-5.8.2* static_mutex_test: borland-5.8.2* test_collate_info: borland-5.8.2* unicode_iterator_test: borland-5.8.2* borland-5.8.2* wide_posix_api_check_cpp: borland-5.8.2* |serialization| test_codecvt_null: borland-5.6.4 borland-5.8.2* borland-5.8.2* test_iterators: borland-5.6.4 borland-5.8.2* borland-5.8.2* test_iterators_base64: borland-5.6.4 borland-5.8.2* borland-5.8.2* test_registered_text_archive_dll: msvc-7.1 test_reset_object_address: msvc-7.0 test_reset_object_address_dll: msvc-7.0 test_utf8_codecvt: borland-5.6.4 borland-5.8.2* borland-5.8.2* test_variant_binary_archive: borland-5.6.4 borland-5.8.2* borland-5.8.2* test_variant_binary_archive_dll: borland-5.6.4 borland-5.8.2* borland-5.8.2* test_variant_text_archive: borland-5.6.4 borland-5.8.2* borland-5.8.2* test_variant_text_archive_dll: borland-5.6.4 borland-5.8.2* borland-5.8.2* test_variant_text_warchive: borland-5.6.4 borland-5.8.2* borland-5.8.2* test_variant_text_warchive_dll: borland-5.6.4 borland-5.8.2* borland-5.8.2* test_variant_xml_archive: borland-5.6.4 borland-5.8.2* borland-5.8.2* test_variant_xml_archive_dll: borland-5.6.4 borland-5.8.2* borland-5.8.2* test_variant_xml_warchive: borland-5.6.4 borland-5.8.2* borland-5.8.2* test_variant_xml_warchive_dll: borland-5.6.4 borland-5.8.2* borland-5.8.2* |signals| dead_slot_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* deletion_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* ordering_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* signal_n_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* trackable_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* |smart_ptr| atomic_count_test: borland-5.8.2* get_deleter_test: borland-5.8.2* intrusive_ptr_test: borland-5.8.2* lw_mutex_test: borland-5.8.2* pointer_cast_test: borland-5.8.2* shared_from_this_test: borland-5.8.2* shared_ptr_alloc2_test: borland-5.8.2* shared_ptr_basic_test: borland-5.8.2* shared_ptr_test: borland-5.8.2* smart_ptr_test: borland-5.8.2* weak_ptr_test: borland-5.8.2* |spirit| switch_tests_eps_default: intel-linux-9.0 |statechart| TransitionTestBoth: qcc-3.3.5_gpp qcc-3.3.5_gpp TransitionTestRelaxed: qcc-3.3.5_gpp qcc-3.3.5_gpp |static_assert| static_assert_example_2: borland-5.8.2* static_assert_example_3: borland-5.8.2* |test| basic_cstring_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* foreach_test: borland-5.8.2* ifstream_line_iterator_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* online_test: borland-5.8.2* test_case_template_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* |thread| test_tss_lib: borland-5.8.2* |tokenizer| examples: borland-5.6.4 borland-5.8.2* borland-5.8.2* simple_example_1: borland-5.6.4 borland-5.8.2* borland-5.8.2* simple_example_2: borland-5.6.4 borland-5.8.2* borland-5.8.2* simple_example_3: borland-5.6.4 borland-5.8.2* borland-5.8.2* simple_example_4: borland-5.6.4 borland-5.8.2* borland-5.8.2* simple_example_5: borland-5.6.4 borland-5.8.2* borland-5.8.2* |tr1| std_test_tr1_include: borland-5.8.2* borland-5.8.2* test_tr1_include: borland-5.8.2* borland-5.8.2* tr1_add_const_test: borland-5.8.2* tr1_add_cv_test: borland-5.8.2* tr1_add_pointer_test: borland-5.8.2* tr1_add_reference_test: borland-5.8.2* tr1_add_volatile_test: borland-5.8.2* tr1_aligned_storage_test: borland-5.8.2* tr1_alignment_of_test: borland-5.8.2* tr1_has_nothrow_assign_test: borland-5.8.2* tr1_has_nothrow_constr_test: borland-5.8.2* tr1_has_nothrow_copy_test: borland-5.8.2* tr1_has_trivial_assign_test: borland-5.8.2* tr1_has_trivial_constr_test: borland-5.8.2* tr1_has_trivial_copy_test: borland-5.8.2* tr1_has_trivial_destr_test: borland-5.8.2* tr1_has_virtual_destr_test: borland-5.8.2* tr1_is_arithmetic_test: borland-5.8.2* tr1_is_array_test: borland-5.8.2* tr1_is_class_test: borland-5.8.2* tr1_is_compound_test: borland-5.8.2* tr1_is_const_test: borland-5.8.2* tr1_is_empty_test: borland-5.8.2* tr1_is_enum_test: borland-5.8.2* tr1_is_floating_point_test: borland-5.8.2* tr1_is_function_test: borland-5.8.2* tr1_is_fundamental_test: borland-5.8.2* tr1_is_integral_test: borland-5.8.2* tr1_is_member_func_test: borland-5.8.2* tr1_is_member_obj_test: borland-5.8.2* tr1_is_member_pointer_test: borland-5.8.2* tr1_is_object_test: borland-5.8.2* tr1_is_pod_test: borland-5.8.2* tr1_is_pointer_test: borland-5.8.2* tr1_is_polymorphic_test: borland-5.8.2* tr1_is_reference_test: borland-5.8.2* tr1_is_same_test: borland-5.8.2* tr1_is_scalar_test: borland-5.8.2* tr1_is_signed_test: borland-5.8.2* tr1_is_union_test: borland-5.8.2* tr1_is_unsigned_test: borland-5.8.2* tr1_is_void_test: borland-5.8.2* tr1_is_volatile_test: borland-5.8.2* tr1_remove_cv_test: borland-5.8.2* tr1_remove_reference_test: borland-5.8.2* tr1_tky_abstract_type_test: borland-5.8.2* tr1_tky_partial_spec_test: borland-5.8.2* |type_traits| add_const_test: borland-5.8.2* add_cv_test: borland-5.8.2* add_pointer_test: borland-5.8.2* add_reference_test: borland-5.8.2* add_volatile_test: borland-5.8.2* aligned_storage_test: borland-5.8.2* alignment_of_test: borland-5.8.2* function_traits_test: borland-5.8.2* has_nothrow_assign_test: borland-5.8.2* has_nothrow_constr_test: borland-5.8.2* has_nothrow_copy_test: borland-5.8.2* has_trivial_assign_test: borland-5.8.2* has_trivial_constr_test: borland-5.8.2* has_trivial_copy_test: borland-5.8.2* has_trivial_destructor_test: borland-5.8.2* has_virtual_destructor_test: borland-5.8.2* is_arithmetic_test: borland-5.8.2* is_array_test: borland-5.8.2* is_class_test: borland-5.8.2* is_compound_test: borland-5.8.2* is_const_test: borland-5.8.2* is_empty_test: borland-5.8.2* is_enum_test: borland-5.8.2* is_float_test: borland-5.8.2* is_floating_point_test: borland-5.8.2* is_function_test: borland-5.8.2* is_fundamental_test: borland-5.8.2* is_integral_test: borland-5.8.2* is_member_func_test: borland-5.8.2* is_member_obj_test: borland-5.8.2* is_member_pointer_test: borland-5.8.2* is_object_test: borland-5.8.2* is_pod_test: borland-5.8.2* is_pointer_test: borland-5.8.2* is_polymorphic_test: borland-5.8.2* is_reference_test: borland-5.8.2* is_same_test: borland-5.8.2* is_scalar_test: borland-5.8.2* is_signed_test: borland-5.8.2* is_stateless_test: borland-5.8.2* is_union_test: borland-5.8.2* is_unsigned_test: borland-5.8.2* is_void_test: borland-5.8.2* is_volatile_test: borland-5.8.2* remove_cv_test: borland-5.8.2* remove_reference_test: borland-5.8.2* tricky_abstract_type_test: borland-5.8.2* tricky_partial_spec_test: borland-5.8.2* type_with_alignment_test: borland-5.8.2* udt_specialisations: borland-5.8.2* |utility| addressof_test: borland-5.8.2* assert_test: borland-5.8.2* base_from_member_test: borland-5.8.2* binary_search_test: borland-5.8.2* call_traits_test: borland-5.8.2* current_function_test: borland-5.8.2* operators_test: gcc-3.4.5_linux_x86_64 shared_iterator_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* value_init_test: borland-5.8.2* |variant| variant_comparison_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* variant_reference_test: borland-5.6.4 borland-5.8.2* borland-5.8.2* variant_test2: borland-5.6.4 borland-5.8.2* borland-5.8.2* variant_test3: borland-5.6.4 borland-5.8.2* borland-5.8.2* variant_test4: borland-5.6.4 borland-5.8.2* borland-5.8.2* variant_test6: borland-5.6.4 borland-5.8.2* borland-5.8.2* variant_test7: borland-5.6.4 borland-5.8.2* borland-5.8.2* variant_test8: borland-5.6.4 borland-5.8.2* borland-5.8.2* |xpressive| c_traits: gcc-4.1.0_linux test_regex_primitives: msvc-7.1

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boost vault
by Andy Little 10 Nov '06

10 Nov '06

Can someone delete the "inner_product.zip" example in Generic Programming section of boost vault? My password doesnt seem to .work Thankyou. regards Andy Little

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[Boost-bugs] [ boost-Support Requests-1594210 ] Graph vs. Multi_index for geometric algorithms
by SourceForge.net 10 Nov '06

10 Nov '06

Support Requests item #1594210, was opened at 2006-11-10 07:19 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=207586&aid=1594210&group_… Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: multi_index Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Joaqu�n M L�pez Mu�oz (joaquintides) Summary: Graph vs. Multi_index for geometric algorithms Initial Comment: Dear Boost Supporter, I am working on an implementation of a 2D polygon boolean class. I am aware that such classes are already available but all have technical (robustness, performance, flexibility) or license (commercial, GPL) limitations. I would like to use STL and Boost as much as possible. Some of my algorithms require various range searches and intersection tests. The multi_index_container class seems ideal to implement these. On the other hand I will need various graph traversal algorithms, which suggests using the Graph library, which has very limited possibilities for sorting an efficient searching. Do you see an easy way to combine the advantages of both libraries? Obviously, I would like to avoid maintaining a separate multi_sorted search structure next to my graph. My email address hans.van.zwol(a)nxp.com hans.van.zwol(a)xs4all.nl Thank you for any helpful suggestions! Hans van Zwol ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=207586&aid=1594210&group_… ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Boost-bugs mailing list Boost-bugs(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs

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Re: [boost] boost::shared_ptr<>::compare_and_swap() -- AmIinsaneforwanting this?
by Talbot, George 10 Nov '06

10 Nov '06

> Talbot, George wrote: > > > I thought that the current implementation of shared_ptr is lock-free > > and multithreaded in the sense that I can pass shared_ptr between > > threads, and the reference count is updated correctly, etc. (I'm > > using BOOST 1.33.) Am I incorrect in thinking this? Peter Dimov wrote: > This is not the same as atomic. An atomic type allows you to modify a > variable from thread A while, at the same time, thread B is also reading > or > writing it. shared_ptr doesn't offer this level of thread-safety. As an > example, consider: > > shared_ptr<X> px; > > // thread A > > shared_ptr<X> px2( px ); > > // thread B > > px = px3; > > (you can also have thread B doing compare and swap, it doesn't matter.) > > Imagine that thread A reads the two pointers from px and is preempted > right > after that. Thread B overwrites the contents of px, and in doing so, > causes > its reference count to drop to zero; the object and the control block are > destroyed. Thread A wakes up and attempts to increment the now non- > existent > reference count. Bad things happen. > > But maybe I'm misunderstanding the intent of your compare and swap > primitive. I apologize if this is rapidly becoming a refresher course for me in multithreaded programming. ;^) Forgetting about compare-and-swap for a second, what you're saying is that the _initialization_ of px2 from px in thread A above is not atomic? Is this sequence atomic? // Before the treads start shared_ptr<X> px(blah); // thread A shared_ptr<X> px2; px2 = px; // thread B px = px3 I thought that constructors, destructors and the assignments were atomic from the documentation, but it doesn't mean I'm reading it right. I'm reading http://www.boost.org/libs/smart_ptr/compatibility.htm. Under "Features That Improve Robustness" it says "The manipulation of use counts is now thread safe on Windows, Linux and platforms that support pthreads. See <boost/detail/atomic_count.hpp> file for details." I really don't understand, based upon that statement and the statements made in the comments of atomic_count.hpp of exactly what operations are thread safe and what aren't when using shared_ptr. I'm sorry if I'm being too dense here. I think a section in the documentation saying exactly what is guaranteed and what isn't would help a lot. -- George T. Talbot gtalbot(a)locuspharma.com

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Re: [boost] boost::shared_ptr<>::compare_and_swap() -- Am I insaneforwanting this?
by Talbot, George 10 Nov '06

10 Nov '06

> Talbot, George wrote: > > Hi, > > > > I have a question for the designers and implementers of > > boost::shared_ptr: > > > > Is there any plan afoot to support lock-free programming using > > shared_ptr? I was fooling around with wanting to attempt lock-free > > update of a tree structure that I have that uses shared_ptr. If > > no-one's thinking about this, how might I go about implementing: > > > > bool boost::shared_ptr<T>::compare_and_swap(T* original, > > shared_ptr<T>& new_one) > Peter Dimov wrote: > > Very, very difficult. :-) shared_ptr is not atomic; I can pass a shared_ptr between threads right now, correct? > you can look at Joe Seigh's atomic_ptr: > > http://atomic-ptr-plus.sourceforge.net/ > > and Chris Thomasson's > > http://appcore.home.comcast.net/vzoom/refcount/ > > for examples of atomic reference counted pointers. > > Shared_ptr can be made atomic by using a spinlock. This isn't really > lock-free, though. I thought that the current implementation of shared_ptr is lock-free and multithreaded in the sense that I can pass shared_ptr between threads, and the reference count is updated correctly, etc. (I'm using BOOST 1.33.) Am I incorrect in thinking this? I can see where compare_and_swap() probably can't be added without adding a sequence number. Am I right saying that this is one of the reasons adding this to shared_pointer isn't realistic? -- George T. Talbot <gtalbot(a)locuspharma.com>

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Re: [boost] [system] Was: Re: [asio] Breaking changes committed to cvs HEAD
by Christopher Kohlhoff 10 Nov '06

10 Nov '06

Hi Johan, Johan Nilsson <r.johan.nilsson(a)gmail.com> wrote: [...] > 2) I've implemented similar code previously, but only designed > for portability with linux and Win32. What I very often use, > is something corresponding to retrieving errno or calling > GetLastError (on Win32). > > With the current design, it is harder to implement library > code throwing system_errors (retrieving error codes) as you'll > need to get the corresponding error code in a > platform-specific way. Or did I miss something? I think the intention is that platform specific library implementations will initialise the error_code in a platform-specific way. At least, this is what asio does. > 4) I'm wondering about best practices for how to use the > error_code class portably while maintaining as much of the > (native) information as possible. Ideally, it should be > possible to check for specific error codes portably, while > having the native descriptions(messages) available for as much > details as possible. Using native_ecat and compare using > to_errno? Asio and its TR2 proposal provide a set of global constants of type error_code that can be used for portably checking for well known error codes. See sections 5.2 and 5.3.2.6 in N2054 for more detail: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2054.pdf Cheers, Chris

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