December 2008 - Boost - lists.preview.boost.org

[asio] overlapped_ptr issue
by Sergei Politov 23 Dec '08

23 Dec '08

Hi, I sent the following letter to asio mail list some time ago: ======================================= I have found the following problem with overlapped_ptr. There is complete method in win_iocp_overlapped_ptr: void complete(const boost::system::error_code& ec, std::size_t bytes_transferred) { if (ptr_) { ptr_->io_service_.post_completion(ptr_, 0, 0); ptr_ = 0; } } As you can see, post_completion does not uses arguments of complete. So it notifies handler with invalid values. ======================================= But I did not receive response from Chris. Where should I submit a ticket? Best Regards, Sergei

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Asio AcceptEx failing with error 121 on Windows with multiple network connections
by Stuart A. Malone 23 Dec '08

23 Dec '08

Hi folks, I'm working with the Boost Asio library from Boost 1.37 on Mac and Windows, and have encountered a problem that only occurs on Windows, and only when the computer has multiple network connections (such as both wired ethernet and WiFi). I started with the "HTTP Server" example code for a simple single- threaded server. I'm running the server on address 0.0.0.0 with port number 0 so that it listens on all network interfaces and allows the OS to select the port number. The server works fine on a Mac with multiple network connections. And on Windows, the default (wired ethernet) connection works fine, too. But if I try to connect to the Windows server over the non-default (WiFi) connection, there is about a 20 second pause and the server exits with error 121, "The semaphore timeout period has expired." I've done some poking around under the debugger, and it appears that the origin of this error is the AcceptEx call in the async_accept<> function in win_iocp_socket_service.hpp, line 2129. While this call does not fail directly since it is an asynchronous call, the error code eventually turns up in the accept_operation::do_completion_impl function in win_iocp_socket_service.hpp, line 1908. I don't really know enough about either Boost Asio or Windows networking to figure out much more on my own. Does anyone have an insight into the source of this problem, or suggestions on how I might go about tracking it down further? Best wishes, --Stuart A. Malone Llamagraphics, Inc. Makers of Life Balance personal coaching software http://www.llamagraphics.com/

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[type_traits] patch for gccxml
by Neal Becker 23 Dec '08

23 Dec '08

Please apply this patch to support current gccxml. The issue is that gccxml will claim to be gcc4.3, but it is really based on gcc4.2, and doesn't support the additional intrinsics (__is_enum, in particular). diff -r 13bbd7c5c6d0 boost/type_traits/intrinsics.hpp --- a/boost/type_traits/intrinsics.hpp Mon Dec 01 07:41:09 2008 -0500 +++ b/boost/type_traits/intrinsics.hpp Tue Dec 23 09:15:32 2008 -0500 @@ -126,7 +126,7 @@ # define BOOST_HAS_TYPE_TRAITS_INTRINSICS #endif -#if defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3))) +#if defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3) && !defined(__GCCXML__))) # include <boost/type_traits/is_same.hpp> # include <boost/type_traits/is_reference.hpp> # include <boost/type_traits/is_volatile.hpp>

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Tests are a mess
by Gennaro Prota 23 Dec '08

23 Dec '08

Few questions: * BGD-Ubuntu is among tested platforms for release, but not for trunk. How is a poor fellow supposed to test on trunk first? * Same as above for BGD-Windows, with the fellow getting poorer and poorer * Are RW_WinXP_VC and RW_WinXP_VCrtl the same? * Can anyone please have a look at the trunk failures for HP-UX_ia64_aCC? For a bunch of libraries I've looked at it gives an Unsatisfied symbol "boost::exception_detail::refcount_ptr<..." What's that? Compiler bug, misconfiguration, phase of the moon? Sorry, but if this is the status quo I'm just going to merge to branches/release and be done with it. -- Genny

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[unique_ptr] So how is it used differently?
by Sid Sacek 23 Dec '08

23 Dec '08

Thank you, I didn't realize it was already a part of the latest boost library. What I'm curious about is two things... 1) When would I choose unique_ptr<> over auto_ptr<> ? And 2) When would I choose unique_ptr<> over scoped_ptr<> ? Can somebody please provide some coding differences? If these coding examples are already documented someplace, can you please direct me to them? Thank you very much in advance. -Sid Sacek -----Original Message----- From: boost-bounces(a)lists.boost.org [mailto:boost-bounces@lists.boost.org] On Behalf Of OvermindDL1 Sent: Sunday, December 21, 2008 6:01 AM To: boost(a)lists.boost.org Subject: Re: [boost] unique_ptr, was: Composing non copyable and movable classes On Sat, Dec 20, 2008 at 3:10 PM, Sid Sacek <heavyreign(a)optonline.net> wrote: > > I tried to locate the mentioned unique_ptr<> classes for testing, but am > unable to locate them. > > Can somebody point me in the right direction please? This is the only unique_ptr I know of: http://www.boost.org/doc/libs/1_35_0/doc/html/interprocess/interprocess_smar t_ptr.html#interprocess.interprocess_smart_ptr.unique_ptr _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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Computer Properties
by Sid Sacek 23 Dec '08

23 Dec '08

Is there a boost library that provides information like: 1) Number of CPU cores ? 2) Total amount of system RAM ? 3) Other system and hardware basics ? Regards, -Sid Sacek

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"thread's copy constructor is inaccessible" BUG in solaris.
by Maruvekere, Praveen (Contractor) 23 Dec '08

23 Dec '08

Hi , I have done the temporary fix to build the boost 1.37.0 as told in one of the solaris user forum thread http://forums.sun.com/thread.jspa?threadID=5326640 <http://forums.sun.com/thread.jspa?threadID=5326640> for the below said error sun.compile.c++ bin.v2/libs/thread/build/sun-5.9/release/link-static/threading-multi/thr ead.o "./boost/thread/detail/thread.hpp", line 344: Error, inaccessible: boost::thread::thread(boost::thread&) is not accessible from boost::move(boost::detail::thread_move_t<boost::thread>). 1 Error(s) detected. Do I need a patch to fix this? -PM-

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[uuid] Interface
by Andy Tompkins 22 Dec '08

22 Dec '08

Here is what I see the interface looking like based on feedback from the review so far. It would, of course, be split into different header files. namespace boost { namespace uuids { class uuid : boost::totally_ordered<uuid> { // no default constructor private: uuid(); public: typedef ... value_type; // will only represent one octet typedef ... iterator; typedef ... const_iterator; typedef ... difference_type; typedef ... size_type; enum variant_type { variant_unknown, variant_ncs, variant_rfc_4122, variant_microsoft }; enum version_type { version_unknown, version_1 = 1, version_2 = 2, version_3 = 3, version_4 = 4, version_5 = 5, version_time_based = version_1, version_dce_security = version_2, version_name_based_md5 = version_3, version_random_number_based = version_4 version_name_based_sha1 = version_4 }; public: // valid expression // generator() - result type must be convertible to a uuid template <typename Generator> explicit uuid(Generator & generator); // assert(std::distance(begin, end) >= 16); template <typename ByteInputIterator> uuid(ByteInputIterator begin, ByteInputIterator end); iterator begin(); iterator end(); const_iterator begin() const; const_iterator end() const; bool is_nil() const; operator unspecified_bool_type() const; // return !is_nil(); static size_type size(); // always return 16 bool operator==(uuid const& rhs) const; bool operator<(uuid const& rhs) const; variant_type variant() const; version_type version() const; }; void swap(uuid & lhs, uuid & rhs); std::size_t hash_value(uuid const& u); // removed get/set_showbraces (does anybody want/use them?) template <typename ch, typename char_traits> std::basic_ostream<ch, char_traits>& operator<<(std::basic_ostream<ch, char_traits>& os, uuid const& u); template <typename ch, typename char_traits> std::basic_istream<ch, char_traits>& operator>>(std::basic_istream<ch, char_traits>& os, uuid& u); class nil_generator // always generates a nil uuid { public: typedef uuid result_type; uuid operator()(); }; uuid nil(); // easy to use function - should it be included? template <typename RandomGenerator = boost::mt19937> class random_generator { public: typedef uuid result_type; random_generator(); explicit random_generator(RandomGenerator & gen); explicit random_generator(RandomGenerator * gen); uuid operator()(); }; // I guess technically a transformer since it does not have a zero argument // operator() class name_based_generator // uses sha1 hash { public: typedef uuid result_type; explicit name_based_generator(uuid const& namespace_uuid); template <typename ch, typename char_traits, typename allocator> uuid operator()(std::basic_string<ch, char_traits, allocator> const& name); uuid operator()(const char* name); // use std::strlen uuid operator()(const wchar_t* name); // use std::wcslen template <typename ByteInputIterator> uuid operator()(ByteInputIterator begin, ByteInputIterator end); }; class windows_generator // uses UuidCreate { public: typedef uuid result_type; uuid operator()(); }; class linux_generator // used uuid_generate { public: typedef uuid result_type; uuid operator()(); }; // on windows - will typedef to windows_generator // on linux - will typedef to linix_generator typedef ... native_generator; } //namespace uuids using uuids::uuid; // so nobody has to type boost::uuids::uuid } //namespace boost BOOST_CLASS_IMPLEMENTATION(boost::uuids::uuid, boost::serialization::primitive_type) /* uuid Generator concept Notation: X - a type that is a model of uuid generator x - an object of type X Associated Types: Result Type - X::result_type - this must be convertable to boost::uuids::uuid Valid Expressions: x() - return a boost::uuids::uuid */ Regards, Andy Tompkins

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[boost.build] should we not define _SECURE_SCL=0 by default for all msvc toolsets
by Thorsten Ottosen 22 Dec '08

22 Dec '08

Dear all, Is there are reason why we do not compile with this flag set by default? Are there any users of Boost out there which actually wants the securuty mode turned on? If not, then I suggest that we change the build settings. Thanks in advance -Thorsten

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Processor traits
by Antoine de Maricourt 22 Dec '08

22 Dec '08

Hi, is there in boost a trait to describe current target capabilities, i.e. processor's available instruction set, size of registers (32, 64, ... bits) and any other usefull feature? To give an example, I'd like to write code like the following one, with different versions of the same function depending on target capabilities. Regards, Antoine. --- namespace detail { template <typename T, unsigned D, typename P = current_target_trait> struct _popcount; template <> struct _popcount<__m128i, 128, ssse3> { int operator()(const __m128i& x) { static const __m128i M = { 0x0f0f0f0f0f0f0f0fULL, 0x0f0f0f0f0f0f0f0fULL }; static const __m128i C = { 0x0302020102010100ULL, 0x0403030203020201ULL }; __m128i y = _mm_add_epi16 (_mm_shuffle_epi8 (C, _mm_and_si128 (x, M)), _mm_shuffle_epi8 (C, _mm_and_si128 (_mm_srai_epi16 (x, 4), M))); return _mm_cvtsi128_si32 (_mm_sad_epu8 (_mm_hadd_epi16 (y, y), _mm_setzero_si128())); } }; // Count bits in the low 64-bit quad word template <> struct _popcount<__m128i, 64, ssse3> { int operator()(const __m128i& x) { static const __m128i M = { 0x0f0f0f0f0f0f0f0fULL, 0x0f0f0f0f0f0f0f0fULL }; static const __m128i C = { 0x0302020102010100ULL, 0x0403030203020201ULL }; __m128i y = _mm_shuffle_epi8 (C, _mm_and_si128 (_mm_unpacklo_epi32 (x, _mm_srai_epi16 (x, 4)), M)); return _mm_cvtsi128_si32 (_mm_sad_epu8 (_mm_hadd_epi16 (y, y), _mm_setzero_si128())); } }; } template <typename T> int popcount (const T& data) { return detail::_popcount<T,sizeof(data)*8>()(data); }

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