- Boost - lists.boost.org

Asio multithreaded server: problem persists, sample program
by berserker_r 24 Nov '06

24 Nov '06

I made the test with the CVS version of boost and I still fall in the problem that I have reported some days ago :( Btw I think that a bug in the Windows API GetQueuedCompletionStatus sounds very strange to me because I think that implementations like this one are very common or I'm wrong? ////////////////////////////////////////////////////////////////////////////////////////////////////////// #include "boost/asio.hpp" #include "boost/thread.hpp" #include "boost/bind.hpp" ////////////////////////////////////////////////////////////////////////////////////////////////////////// class Session { public: Session(boost::asio::io_service &service) : m_socket(service) { } ~Session() { m_socket.close(); } boost::asio::ip::tcp::socket & socket() { return m_socket; } void run() { m_socket.async_read_some(boost::asio::buffer(m_buffer), boost::bind(&Session::read_handler, this, _1, _2)); } std::string generate_response() { Sleep(10000); // It takes a lot of time to say Hello :) static int counter = 0; counter++; std::stringstream stream; stream << "<html><body><h2>Hello " << counter << "</h2></body></html>"; return stream.str(); } void read_handler(const boost::system::error_code &e, size_t bytes_transferred) { if(!e) { boost::asio::async_write(m_socket, boost::asio::buffer(generate_response()), boost::bind(&Session::write_handler, this, _1, _2)); } } void write_handler(const boost::system::error_code &e, size_t bytes_transferred) { delete this; } private: boost::asio::ip::tcp::socket m_socket; boost::array<char, 8192> m_buffer; }; ////////////////////////////////////////////////////////////////////////////////////////////////////////// class Server { public: Server(int port) : m_service(), m_acceptor(m_service) { boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::tcp::v4(), port); m_acceptor.open(endpoint.protocol()); m_acceptor.bind(endpoint); m_acceptor.listen(); accept(); } void accept() { Session *connection = new Session(m_service); m_acceptor.async_accept(connection->socket(), boost::bind(&Server::accept_handler, this, _1, connection)); } void run(int threads = 10) { boost::thread_group threads_pool; while(threads-- > 0) threads_pool.create_thread(boost::bind(&boost::asio::io_service::run, &m_service)); m_service.run(); } void accept_handler(const boost::system::error_code &e, Session *connection) { if(!e) { connection->run(); accept(); } } protected: boost::asio::io_service m_service; boost::asio::ip::tcp::acceptor m_acceptor; }; ////////////////////////////////////////////////////////////////////////////////////////////////////////// int main(int argc, char *argv) { Server server(7070); server.run(); return 0; } ////////////////////////////////////////////////////////////////////////////////////////////////////////// As reported in my previous message all handlers are invoked with the params _1/_2 due to a multiple definition link error. Bye

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[Boost-bugs] [ boost-Bugs-1602075 ] Lambda: (_1 + "y")(string("x")) Doesn't Compile
by SourceForge.net 24 Nov '06

24 Nov '06

Bugs item #1602075, was opened at 2006-11-23 19:14 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=1602075&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: Lambda: (_1 + "y")(string("x")) Doesn't Compile Initial Comment: This program: #include <iostream> #include <ostream> #include <string> #include <boost/lambda/lambda.hpp> int main() { const std::string s("Hello"); std::cout << (boost::lambda::_1 + ", world!")(s) << std::endl; } fails to compile with Boost 1.33.1 (on GCC 3.4.2 and GCC 4.1.1, at least) due to at least two bugs. One bug is in boost/lambda/detail/operators.hpp, lines 269-271. This function, declared to return a lambda_functor, returns a lambda_functor constructed from a tuple. But there is no such constructor. Instead, 'lambda_functor<' should be deleted from line 269 (and the closing '>' from line 271) so that it returns a lambda_functor_base constructed from a tuple. That constructor (which is explicit) does exist, and so does a lambda_functor constructor (which is implicit) from a lambda_functor_base. This is exactly what the macro BOOST_LAMBDA_PTR_ARITHMETIC_E2 immediately below does, and there is no reason for BOOST_LAMBDA_PTR_ARITHMETIC_E1 to be different. Unfortunately, fixing that leaves another, more complicated bug: for some reason, the return type appears to be deduced as const char * instead of std::string. See for yourself. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1602075&group_… ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Boost-bugs mailing list Boost-bugs(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs

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[iterators] Iterator Operations
by Sebastian Redl 23 Nov '06

23 Nov '06

Hi, A few days ago, I made a comment about std::distance() and std::advance() being reimplemented for the new style iterator concepts. Dave said that patches are welcome. So I sat down and wrote some preliminary versions of the two functions. They are in the attached file. The file parses cleanly, but I have not tried instantiating any of the templates yet. I have a question, though. Does it make sense to implement boost::distance for single pass iterators? Is there anything useful that could be done with the resulting information? Aside from that, I'd be happy to receive any suggestions for code improvement, adherence to Boost standards, and so on. Sebastian Redl

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lexertl for Wave
by ben＠benhanson.net 23 Nov '06

23 Nov '06

First of all, sorry for the confusion with the TFB disclaimer! I have now changed my e-mail address for the boost mailing list to my private one. Obviously lexertl is non-proprietary and in fact in licence.txt (in lexertl.zip) you will find that it is a copy of the boost licence! Using lexertl in Wave seems like a very nice first step to getting the library accepted into boost. How would I go about doing this? Thanks, Ben Hanson ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.

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enum pickle issue in boost python
by Shashank Bapat 23 Nov '06

23 Nov '06

Both pickle and cPickle seem to have problem pickling boost wrapped enum types. Pickle protocol used here is 2. Problem is causes by enum.cpp. In there __name__ and __module__ are intentionally set in certain way (which is different than how its done in class.cpp). So I suppose there is a valid reason why its that way. In that case the __reduce__ and __reduce_ex__ implementation for enum_ should take care of this so as to ensure proper pickling. Example: import EnumTest import cPickle try: print "Lets pickle some boost enum:" f = open("tmp1.txt", "w") cPickle.dump( EnumTest.Color.red , f, cPickle.HIGHEST_PROTOCOL) except: print "FAIL\n" try: print "Why is EnumTest.Color.__name__ = '%s' and \nEnumTest.Color.__module__= '%s' ?\n" % ( EnumTest.Color.__name__, EnumTest.Color.__module__) print "Lets hack it and try again:" f = open("tmp2.txt", "w") EnumTest.Color.__name__ = "Color" EnumTest.Color.__module__ = "EnumTest" l = (EnumTest.Color.red, EnumTest.Color.green, EnumTest.Color.blue) for e in l: cPickle.dump( e , f, cPickle.HIGHEST_PROTOCOL) f.close() print "PASS\n" print "Unpickle Test:" f = open("tmp2.txt", "r") for e in l: if e != cPickle.load(f): raise "Load Failed" print "PASS\n" except: print "FAIL\n" Thanks -Shashank _________________________________________________________________ Get free, personalized commercial-free online radio with MSN Radio powered by Pandora http://radio.msn.com/?icid=T002MSN03A07001

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Review Request: Accumulators Framework and Statistical Accumulators Library
by Eric Niebler 23 Nov '06

23 Nov '06

My framework for incremental statistical accumulation is ready for review. Here is the overview: > Boost.Accumulators is both a library for incremental statistical computation as well as an extensible framework for incremental calculation in general. The library deals primarily with the concept of an accumulator, which is a primitive computational entity that accepts data one sample at a time and maintains some internal state. These accumulators may offload some of their computations on other accumulators, on which they depend. Accumulators are grouped within an accumulator set. Boost.Accumulators resolves the inter-dependencies between accumulators in a set and ensures that accumulators are processed in the proper order. The documentation is available online at: http://boost-sandbox.sourceforge.net/libs/accumulators/doc/html/index.html The download is in the Boost Vault in accumulators.zip at: http://boost-consulting.com/vault/index.php?directory=Math%20-%20Numerics This library is very much a complement to John Maddock's work on his statistical functions, which could be adapted to fit into this framework. If anybody wants the docs in PDF format, please send me a request. It's a 10 Mb file, and the Vault won't take it. -- Eric Niebler Boost Consulting www.boost-consulting.com

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Boost inspection notification (2006-11-23/RC_1_34_0) *X*
by Rene Rivera 23 Nov '06

23 Nov '06

Boost Inspection Report Run Date: 17:04:12 UTC, Thursday 23 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: 11421 files scanned 890 directories scanned (including root) 253 problems reported Problem counts: 0 files with invalid line endings 0 bookmarks with invalid characters 3 invalid urls 175 broken links 32 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) graph (3) inspect (1) interprocess (1) iostreams (15) 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 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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: 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Boost inspection notification (2006-11-23/RC_1_34_0) *LC*
by Rene Rivera 23 Nov '06

23 Nov '06

Boost Inspection Report Run Date: 17:04:23 UTC, Thursday 23 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: 11421 files scanned 890 directories scanned (including root) 1132 problems reported Problem counts: 736 files missing Boost license info or having wrong reference text 396 files missing copyright notice Summary: any (1) archive (1) array (1) boost-root (4) boostbook (2) build (58) compatibility (2) concept_check (22) conversion (5) detail (4) disjoint_sets (2) doc (2) filesystem (2) format (8) function (1) functional (8) inspect (1) integer (9) iostreams (2) lambda (10) libs (6) logic (2) math (1) more (30) mpl (419) multi_array (13) numeric (198) optional (1) people (10) pool (30) program_options (35) property_map (15) ptr_container (8) python (6) quickbook (11) random (20) rational (5) regex (4) regression (64) release (2) serialization (16) smart_ptr (8) test (5) timer (1) tokenizer (9) tr1 (2) tuple (5) utility (19) variant (42) Details: *L* missing Boost license info, or wrong reference text *C* missing copyright notice |any| libs/any/doc/ any.xml: *L* |archive| 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Boost regression notification (2006-11-23 [RC_1_34_0])
by Douglas Gregor 23 Nov '06

23 Nov '06

Boost Regression test failures Report time: 2006-11-23T10:27:30Z 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… 212 failures in 21 libraries concept_check (60) date_time (2) io (1) iostreams (10) iterator (3) lambda (1) math (26) mpl (3) numeric/interval (2) optional (1) parameter (1) python (58) random (1) serialization (8) signals (4) spirit (2) statechart (14) test (12) thread (1) utility (1) xpressive (1) |concept_check| class_concept_fail_expected: borland-5.6.4 borland-5.8.2 borland-5.8.2 cw-9.4 darwin-4.0.1 gcc-3.2.3_linux gcc-3.3.6 gcc-3.3.6_linux gcc-3.4.4 gcc-3.4.5_linux gcc-3.4.5_linux_x86_64 gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 gcc-4.1.1_sunos_i86pc hp_cxx-71_006_tru64 intel-linux-9.0 intel-vc71-win-9.1 intel-vc8-win-9.1 msvc-6.5 msvc-7.0 msvc-7.1 msvc-7.1 msvc-8.0 msvc-8.0 qcc-3.3.5_cpp qcc-3.3.5_cpp qcc-3.3.5_gpp qcc-3.3.5_gpp sun-5.8 concept_check_fail_expected: borland-5.6.4 borland-5.8.2 borland-5.8.2 cw-9.4 darwin-4.0.1 gcc-3.2.3_linux gcc-3.3.6 gcc-3.3.6_linux gcc-3.4.4 gcc-3.4.5_linux gcc-3.4.5_linux_x86_64 gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 gcc-4.1.1_sunos_i86pc hp_cxx-71_006_tru64 intel-linux-9.0 intel-vc71-win-9.1 intel-vc8-win-9.1 msvc-6.5 msvc-7.0 msvc-7.1 msvc-7.1 msvc-8.0 msvc-8.0 qcc-3.3.5_cpp qcc-3.3.5_cpp qcc-3.3.5_gpp qcc-3.3.5_gpp sun-5.8 |date_time| testduration: borland-5.8.2 testgenerators_dll: gcc-4.1.0_linux |io| ios_state_test: borland-5.8.2 |iostreams| bzip2_test: msvc-7.1 msvc-8.0 file_descriptor_test: cw-9.4 finite_state_filter_test: cw-9.4 gzip_test: msvc-7.1 msvc-8.0 mapped_file_test: cw-9.4 newline_test: borland-5.8.2 zlib_test: msvc-7.1 msvc-8.0 |iterator| filter_iterator_test: borland-5.8.2 lvalue_concept_fail: borland-5.8.2 msvc-7.1 |lambda| bind_tests_simple: intel-linux-9.0 |math| common_factor_test: borland-5.8.2 cw-9.4 darwin-4.0.1 gcc-3.2.3_linux gcc-3.3.6 gcc-3.3.6_linux gcc-3.4.4 gcc-3.4.5_linux gcc-3.4.5_linux_x86_64 gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 gcc-4.1.1_sunos_i86pc hp_cxx-71_006_tru64 intel-linux-9.0 intel-vc71-win-9.1 intel-vc8-win-9.1 msvc-6.5 msvc-7.0 msvc-7.1 msvc-7.1 msvc-8.0 msvc-8.0 qcc-3.3.5_cpp qcc-3.3.5_gpp sun-5.8 |mpl| int: borland-5.8.2 integral_c: borland-5.8.2 size_t: borland-5.8.2 |numeric/interval| mul: borland-5.8.2 test_float: borland-5.8.2 |optional| optional_test: borland-5.8.2 |parameter| python_test: msvc-7.1 |python| andreas_beyer: msvc-7.1 args: msvc-7.1 auto_ptr: msvc-7.1 back_reference: msvc-7.1 ben_scott1: msvc-7.1 bienstman1: msvc-7.1 bienstman2: msvc-7.1 bienstman3: msvc-7.1 builtin_converters: msvc-7.1 callbacks: msvc-7.1 const_argument: msvc-7.1 crossmod_exception: msvc-7.1 crossmod_opaque: msvc-7.1 data_members: msvc-7.1 defaults: msvc-7.1 dict: msvc-7.1 docstring: msvc-7.1 enum: msvc-7.1 exception_translator: msvc-7.1 extract: msvc-7.1 implicit: msvc-7.1 injected: msvc-7.1 iterator: msvc-7.1 keywords: msvc-7.1 list: msvc-7.1 long: msvc-7.1 map_indexing_suite: msvc-7.1 minimal: msvc-7.1 multi_arg_constructor: msvc-7.1 nested: msvc-7.1 numpy: msvc-7.1 object: msvc-7.1 opaque: msvc-7.1 operators: msvc-7.1 pearu1: msvc-7.1 pickle1: msvc-7.1 pickle2: msvc-7.1 pickle3: msvc-7.1 pickle4: msvc-7.1 pointer_vector: msvc-7.1 polymorphism: msvc-7.1 polymorphism2: msvc-7.1 polymorphism2_auto_ptr: msvc-7.1 properties: msvc-7.1 raw_ctor: msvc-7.1 return_arg: msvc-7.1 shared_ptr: msvc-7.1 slice: msvc-7.1 staticmethod: msvc-7.1 stl_iterator: msvc-7.1 str: msvc-7.1 test_pointer_adoption: msvc-7.1 try: msvc-7.1 tuple: msvc-7.1 vector_indexing_suite: msvc-7.1 virtual_functions: msvc-7.1 voidptr: msvc-7.1 wrapper_held_type: msvc-7.1 |random| random_test: intel-linux-9.0 |serialization| test_no_rtti_xml_archive_dll: qcc-3.3.5_gpp test_reset_object_address: msvc-7.0 test_reset_object_address_dll: msvc-7.0 test_utf8_codecvt: borland-5.8.2 test_variant_xml_archive: borland-5.8.2 test_variant_xml_archive_dll: borland-5.8.2 test_variant_xml_warchive: borland-5.8.2 test_variant_xml_warchive_dll: borland-5.8.2 |signals| deletion_test: msvc-6.5 ordering_test: msvc-6.5 signal_n_test: msvc-6.5 trackable_test: msvc-6.5 |spirit| symbols_add_null: msvc-7.1 symbols_add_null_debug: msvc-7.1 |statechart| BitMachineExample: qcc-3.3.5_cpp qcc-3.3.5_gpp CameraExample: cw-9.4 FifoSchedulerTestBoth: cw-9.4 intel-vc71-win-9.1 FifoSchedulerTestNative: cw-9.4 intel-vc71-win-9.1 FifoSchedulerTestNormal: cw-9.4 intel-vc71-win-9.1 FifoSchedulerTestRelaxed: cw-9.4 intel-vc71-win-9.1 PerformanceExample: cw-9.4 TransitionTestBoth: qcc-3.3.5_gpp TransitionTestRelaxed: qcc-3.3.5_gpp |test| prg_exec_fail1: intel-vc71-win-9.1 intel-vc8-win-9.1 msvc-6.5 msvc-7.0 msvc-7.1 msvc-8.0 prg_exec_fail2: darwin-4.0.1 prg_exec_fail3: borland-5.8.2 cw-9.4 msvc-7.1 test_case_template_test: borland-5.8.2 test_fp_comparisons: cw-9.4 |thread| test_tss_lib: borland-5.8.2 |utility| operators_test: gcc-3.4.5_linux_x86_64 |xpressive| test3u: qcc-3.3.5_cpp

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Preliminary working prototype of atomic_shared--multithreaded wrapper for shared_ptr.
by Talbot, George 23 Nov '06

23 Nov '06

Hi, I've attached to this e-mail a working prototype of a wrapper for shared_ptr that uses a spinlock so that the shared_ptr may be updated atomically from multiple threads. For example, two threads can both attempt to set the value of the same shared_ptr, and the last one will win. This wrapper includes a "compare_and_set" method for performing lock-free-style "read, copy, attempt swap, repeat" updating to a data structure, though, of course because the wrapper uses a spinlock, it isn't truly lock free. This is a demonstration to see if there's interest out there. It's useful in my multithreaded application, and I would like to contribute it to BOOST if it's wanted. There are several issues and questions I'd want to resolve first, though: - This prototype only compiles on platforms that have pthread_spinlock_t available. - Does weak_ptr<> need to be similarly wrapped? - If weak_ptr<> needs to be wrapped, that would imply that enable_atomic_shared_from_this would need to be defined, as its implementation uses weak_ptr<>. - Is it possible to use locked compare-and-exchange instructions to swap the entire shared_ptr<> 8-byte (x86) structure and get rid of the spinlock? Instead of a bunch of assembly, would it make more sense to use the prototype atomic_ops library from Hans Boehm at HP? http://www.hpl.hp.com/research/linux/atomic_ops/ - There's also Chris Thomasson's refcount library. http://appcore.home.comcast.net/vzoom/refcount/ - Is anyone else working on something like this? I wouldn't want to duplicate effort. Specifically, is anyone working on something that tries to stick to the public interface of shared_ptr<>? My major interest in this is that I like the public API of shared_ptr very much, and since it appears to be headed for standardization, I'm interested in a variant that's any of: - A shared_ptr<> implementation with atomic safety guarantees. - or - - A wrapper that can be used to wrap shared_ptr<> that has as close an interface as I can get to shared_ptr<>, a-la the prototype I've attached. - or - - Some other template class that doesn't use shared_ptr<> at all but shares a most/all of the public API of shared_ptr<>. Ideally, I want a solution to be lock-free. My next steps will be to investigate prototypes using (either/both) the HP library and/or the Thomasson library. Please let me know if you think I'm going down a dead-end here, or if you'd like to help. Thanks. -- George T. Talbot <gtalbot(a)locuspharma.com> P.S. Right now I have, in my large multithreaded program, a single typedef, previously using shared_ptr<> when it was single-threaded, currently using atomic_shared<> now that it's multithreaded, that I can replace with something else, so alternate implementations are not drastically hard to try out.

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