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I think using spinlocks to simulate an atomic shared_ptr is deadlock-prone, or inefficient.
by Talbot, George 17 Nov '06

17 Nov '06

I've been playing around with the atomic_shared example class that I posted, and I'm not entirely happy with a spinlock-based solution to a shared_ptr type class. To implement operator= for a class like this has two issues: 1) operator= for an atomic shared_ptr can only be "best effort". If another thread wins out, so be it. I'm going to, for the purposes of this discussion, assume that this is OK, and that if you don't like it, you'll use compare_and_set/swap to do a better job. 2) Without any sort of 2-pointer-wide atomic assignment in hardware, operator= really looks like this: lock the source pointer make a local copy of it release the source pointer lock the destination set the value of the destination from the copy unlock the destination This won't deadlock, but has to make an extra copy of the pointer locally. To avoid the copy, we would have to lock both the source and destination before the assignment of the underlying shared_ptr, which, in the code I sent I did, but is deadlock-prone. See the implementation of swap for even more inefficiency. However, what is the "right" way to do this? I read the stuff from Chris Thommason and I have to admit that I'm not too sure how I'd wrap shared_ptr with it to make this work. Can I have a bit of brainstorming assistance? P.S. Appended is a version of atomic_shared using spinlocks that I don't think deadlocks, but I could be wrong. Can I get a bit of help looking at it from more experienced eyes? P.S. Peter Dimov: Is it OK that I put your name on this as one of the authors? You had told me in previous posts to the list how the operations should likely work with a spinlock, so it seemed appropriate. -- George T. Talbot <gtalbot(a)locuspharma.com> /** \file atomic_shared.h * * \author George T. Talbot * \author Peter Dimov * * \brief This file defines a template class that can wrap * boost::shared_ptr and provide thread-safe atomic * read/write operations. * * (C) Copyright George Talbot, Peter Dimov 2006. * * Distributed under the Boost Software License, Version 1.0. (See * accompanying file LICENSE_1_0.txt or copy at * http://www.boost.org/LICENSE_1_0.txt) */ #ifndef ATOMIC_SHARED_H #define ATOMIC_SHARED_H #include <boost/shared_ptr.hpp> #include <pthread.h> #include <stdexcept> #include <cerrno> #include <cassert> #ifdef ATOMIC_ABORT_ON_ERROR #define ATOMIC_SHARED_ABORT ::abort(); #else #define ATOMIC_SHARED_ABORT #endif /** A wrapper for shared_ptr that implements atomic assignments and compare_and_swap. */ template<class T> class atomic_shared { typedef boost::shared_ptr<T> base_ptr; /** Lock a spinlock protecting an atomic pointer. * * @param l Spinlock to lock. * @param should_throw If true, thrown an exception if lock fails. */ static void lock(pthread_spinlock_t& l, bool should_throw = true) { int rv = ::pthread_spin_lock(&l); if (rv) { errno = rv; ATOMIC_SHARED_ABORT if (should_throw) { throw std::logic_error("can't lock spinlock"); } } } /** Unlock a spinlock protecting an atomic pointer. */ static void unlock(pthread_spinlock_t& l) { int rv = ::pthread_spin_unlock(&l); if (rv) { ATOMIC_SHARED_ABORT errno = rv; throw std::logic_error("can't lock spinlock"); } } /** Initialize a spinlock protecting an atomic pointer. */ static void init(pthread_spinlock_t& l) { int rv = ::pthread_spin_init(&l, PTHREAD_PROCESS_PRIVATE); if (rv) { ATOMIC_SHARED_ABORT errno = rv; throw std::logic_error("can't initialize spinlock"); } } public: typedef typename base_ptr::element_type element_type; ///< Type of element to which pointer points. typedef typename base_ptr::value_type value_type; ///< Same as element_type. typedef typename base_ptr::pointer pointer; ///< Pointer to refcounted object. typedef typename base_ptr::reference reference; ///< Reference to refcounted object. /** Initialize an empty spinlock. */ atomic_shared() { init(spinlock); } /** Create a managed pointer from a bare one. */ template<class Y> explicit atomic_shared(Y* p) : ptr(p) { init(spinlock); } /** Create a managed pointer from a bare one, and a custom deleter. */ template<class Y, class D> atomic_shared(Y * p, D d) : ptr(p, d) { init(spinlock); } atomic_shared(const base_ptr& p) : ptr(p) { init(spinlock); } atomic_shared(const atomic_shared<T>& p) { init(spinlock); lock(p.spinlock); ptr = p.ptr; unlock(p.spinlock); } atomic_shared<T>& operator=(atomic_shared<T> p) // local copy to avoid deadlock. { if (&p != this) { lock(spinlock); ptr = p.ptr unlock(spinlock); } return *this; } template<class Y> atomic_shared(const atomic_shared<Y>& p) { init(spinlock); lock(p.spinlock); ptr = p.ptr; unlock(p.spinlock); } template<class Y> atomic_shared<T>& operator=(atomic_shared<Y> p) // local copy to avoid deadlock. { lock(spinlock); ptr = p.ptr unlock(spinlock); return *this; } ~atomic_shared() { // Lock the spinlock to hold off all other copiers. lock(spinlock, false); // Destroy the spinlock--this should cause all other copiers to // either assert or throw. int rv = ::pthread_spin_destroy(&spinlock); // For debugging, drop us into the debugger if we can't destroy the // spinlock. if (rv) { ATOMIC_SHARED_ABORT } } /** Reset the pointer to an empty pointer. */ void reset() { lock(spinlock); ptr.reset(); unlock(spinlock); } /** Reset the pointer and replace it with a new bare pointer. */ template<class Y> void reset(Y* p) { lock(spinlock); ptr.reset(p); unlock(spinlock); } /** Reset the pointer and replace it with a new bare pointer with custom deleter. */ template<class Y, class D> void reset(Y* p, D d) { lock(spinlock); ptr.reset(p, d); unlock(spinlock); } reference operator*() const { return ptr.operator*(); } T* operator->() const { return ptr.operator->(); } T* get() const { return ptr.get(); } operator bool() const { return ptr; } bool operator!() const { return !ptr; } bool unique() const { return ptr.unique(); } long use_count() const { return ptr.use_count(); } /** Atomically swap the pointer with another pointer. */ void swap(atomic_shared<T>& other) { atomic_shared<T> temp(*this); atomic_shared<T> temp2(other); lock(spinlock); ptr = temp2.ptr; unlock(spinlock); lock(other.spinlock); other = temp.ptr; unlock(other.spinlock); } /** Attempt to set the value of the pointer with another pointer, but only if the * pointer is the same as a previously sampled value of the pointer. * * @return true if the swap was successful. */ bool compare_and_set(const atomic_shared<T>& cmp, atomic_shared<T> xchg) // Note that xchg is a local copy. { int rv = ::pthread_spin_trylock(&spinlock); switch (rv) { case EBUSY: if ((void*)&xchg < (void*)this) unlock(xchg.spinlock); return false; case 0: break; default: ATOMIC_SHARED_ABORT errno = rv; throw std::logic_error("can't pthread_spin_trylock"); } bool r = ptr == cmp.ptr; if (r) ptr.swap(xchg.ptr); unlock(spinlock); return r; } private: template<class Y> friend class atomic_shared; base_ptr ptr; mutable pthread_spinlock_t spinlock; }; // atomic_shared #endif

3 2

atomic_ops library
by Neal Becker 17 Nov '06

17 Nov '06

Perhaps of some interest: http://www.hpl.hp.com/research/linux/atomic_ops/

3 5

[proposal] Atomically Thread-Safe Static Initialization For Boost...
by Chris Thomasson 16 Nov '06

16 Nov '06

Here is the C++ pseudo-code: namespace atomic { template<typename T> class var; template<typename T> class once; namespace mb { enum naked_e { naked }; enum fence_e { fence }; enum release_e { release }; enum depends_e { depends }; enum acquire_depends_e { acquire_depends }; } namespace externlib_api { class hashed_mutex; template<typename T> extern T load(T volatile*, mb::naked_e) const throw(); template<typename T> extern T load(T volatile*, mb::depends_e) const throw(); template<typename T> extern void store(T volatile*, T const&, mb::release_e) throw(); template<typename T> extern void store(T volatile*, T const&, mb::naked_e) throw(); template<typename T> extern bool cas(T volatile*, T const&, T const&, mb::acquire_depends_e) throw(); template<typename T> extern bool cas(T volatile*, T const&, T const&, mb::fence_e) throw(); } template<typename T> class var { mutable T volatile m_state; public: var() throw() {} var(T const &state) throw() : m_state(state) {} public: inline T load(mb::depends_e) const throw() { return externlib_api::load(&m_state, mb::depends); } inline T load(mb::naked_e) const throw() { return externlib_api::load(&m_state, mb::naked); } public: inline void store(T const &xchg, mb::fence_e) throw() { externlib_api::store(&m_state, xchg, mb::fence); } inline void store(T const &xchg, mb::naked_e) throw() { externlib_api::store(&m_state, xchg, mb::naked); } public: inline bool cas(T const &cmp, T const &xchg, mb::fence_e) throw() { return externlib_api::cas(&m_state, cmp, xchg, mb::fence); } inline bool cas(T const &cmp, T const &xchg, mb::acquire_depends_e) throw() { return externlib_api::cas(&m_state, cmp, xchg, mb::acquire_depends); } }; template<typename T> class once { var<T*> m_state; var<intword_t> m_count; public: once() throw() : m_state(0), m_count(1) {} ~once() throw() { if (try_dec()) { try { delete local; } catch(...) { assert(false); throw; } } } private: bool try_dec() throw() { intword_t local; do { local = m_count.load(mb::naked); if (! local || local < 1) { return false; } // use mb::fence to cover *both acquire and release // wrt the result of the decrement } while(! m_count.cas(local, local - 1, mb::fence)); return (local == 1); } bool try_inc() throw() { intword_t local; do { local = m_count.load(mb::naked); if (! local || local < 1) { return false; } } while(! m_count.cas(local, local + 1, mb::acquire_depends)); return true; } public: // atomic load / thread-saftey: strong T* load() const { T *local = m_state.load(mb::depends); if (! local) { externlib_api::hashed_mutex::guard_t const &lock(this); if (! try_inc()) { return 0; } local = m_state.load(mb::naked); if (! local) { // call try_dec on exceptions... local = new T; m_state.store(local, mb::release); } } else if(! try_inc()) { return 0; } return local; } // dec the refcount void dec() { if (try_dec()) { delete local; } } }; } okay, here is sample usage now: static atomic::once<foo> g_foo; void some_threads(...) { for(;;) { // whatever... foo *myfoo = g_foo.load(); if (myfoo) { // use myfoo... // okay, we are finished with myfoo g_foo.dec(); } } } This should be a workable solution to the static initialization problem... What do you all think?

3 25

Re: [boost] Review Request: Boost Exception
by Matthew Herrmann 16 Nov '06

16 Nov '06

> > Message: 5 > Date: Tue, 14 Nov 2006 20:38:43 +0200 > From: "Peter Dimov" <pdimov(a)mmltd.net> > Subject: Re: [boost] Review Request: Boost Exception > To: <boost(a)lists.boost.org> > Message-ID: <00ee01c7081c$1f94f230$6607a8c0@pdimov2> > Content-Type: text/plain; format=flowed; charset="iso-8859-1"; > reply-type=original > > David Abrahams wrote: > >> > "Peter Dimov" <pdimov(a)mmltd.net> writes: >> > >> >>> >> David Abrahams wrote: >>> >>>> >>> "Peter Dimov" <pdimov(a)mmltd.net> writes: >>>> >>> >>>> >>>>> >>>> Moving the catch clause to a destructor doesn't seem an improvement >>>>> >>>> to me. >>>>> >>>> >>> >>>> >>> Using a catch clause to add information to a propagating exception >>>> >>> feels syntactically heavy to me, but of course others may disagree. >>>> >>> And it may also be that without language support, there's not >>>> >>> really a good way to avoid that weight. I'm just expressing an >>>> >>> aesthetic preference here. >>>> >>> >> >>> >> Won't you need to prepare all the extra information even if nothing >>> >> throws? >>> >> > >> > No, you could do it lazily. >> > > I'm afraid that I need to be shown an example in order to "get it". :-) > I think Mr Abrahams is referring to an idea similar to this: (please ignore the class name, it is a placeholder only) void read_file() { boost::exception_info e(..., filename, current_pos, is_connected); ... e.success(); return; } e.success() sets a flag to true, which prevents the generation of error information when the object is destroyed. To remove the e.success(), you'd need to detect whether the stack was being unwound due to an exception or due to a natural return. This is where language support (or compiler-dependent tricks) would be required. Nested exceptions complicate that picture. The other issue is how to handle return values cleanly. You could make success() a pass-through function so you could handle return values with a shorter syntax: int sum(int a, int b) { error_info e; ... return e.success(a+b); } template <typename T> T& error_info::success(T& value) { flag = true; return rhs; } (special care needed to avoid copying and to handle references/temporaries etc). Ultimately, this approach is cleaner when there are more exit points due to exceptions than from return statements. Otherwise, you could forget to call success() at one of the return sites and hit a performance issue as it generates the exception info. Regards, Matthew Herrmann

8 11

Re: [boost] [fusion] comparing iterators with is_same?
by dan marsden 16 Nov '06

16 Nov '06

Steven Watanabe wrote: > >In accumulate and fold I see > >is_same< > typename result_of::begin<Sequence const>::type > , typename result_of::end<Sequence const>::type>() > >shouldn't this be result_of::equal_to<...>()? > You're correct, that is a defect. Now fixed in CVS. Thanks for picking this up Cheers Dan Send instant messages to your online friends http://uk.messenger.yahoo.com

1 0

Re: [boost] Asio multithreaded http server
by Christopher Kohlhoff 16 Nov '06

16 Nov '06

berserker_r <berserker_r(a)hotmail.com> wrote: > Actually the server looks to be "locked" to accept new > connections until the current session has finished its work > even calling io_service::run from multiple threads. What OS are you using? Is the session's work CPU bound? Cheers, Chris

4 3

Boost inspection notification (2006-11-16/RC_1_34_0) *LC*
by Rene Rivera 16 Nov '06

16 Nov '06

Boost Inspection Report Run Date: 17:04:17 UTC, Thursday 16 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: 11424 files scanned 891 directories scanned (including root) 1267 problems reported Problem counts: 832 files missing Boost license info or having wrong reference text 435 files missing copyright notice Summary: any (1) archive (1) array (1) assign (2) 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 (22) pool (30) program_options (35) property_map (15) ptr_container (111) python (6) quickbook (11) random (20) range (18) 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: 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Boost inspection notification (2006-11-16/RC_1_34_0) *X*
by Rene Rivera 16 Nov '06

16 Nov '06

Boost Inspection Report Run Date: 17:04:06 UTC, Thursday 16 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: 11424 files scanned 891 directories scanned (including root) 254 problems reported Problem counts: 0 files with invalid line endings 0 bookmarks with invalid characters 3 invalid urls 176 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) fusion (1) 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 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/guide/text_processing.html: *A* unlinked file libs/iostreams/doc/installation.html: *A* broken link: ../../../tools/build/v1/build_system.htm libs/iostreams/doc/tutorial/container_device.html: *A* unlinked file libs/iostreams/doc/tutorial/dictionary_filters.html: *A* unlinked file libs/iostreams/doc/tutorial/dual_use_filters.html: *A* unlinked file libs/iostreams/doc/tutorial/filter_usage.html: *A* unlinked file libs/iostreams/doc/tutorial/line_wrapping_filters.html: *A* unlinked file libs/iostreams/doc/tutorial/multichar_filters.html: *A* unlinked file libs/iostreams/doc/tutorial/shell_comments_filters.html: *A* unlinked file libs/iostreams/doc/tutorial/tab_expanding_filters.html: *A* unlinked file libs/iostreams/doc/tutorial/unix2dos_filters.html: *A* unlinked file libs/iostreams/doc/tutorial/writing_devices.html: *A* unlinked file |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: ../tools/build/v1/gcc-nocygwin-tools.html *A* broken link: ../tools/build/v1/gcc-stlport-tools.html *A* broken link: ../tools/build/v1/gcc-tools.html *A* broken link: ../tools/build/v1/intel-linux-tools.html *A* broken link: ../tools/build/v1/intel-win32-tools.html *A* broken link: ../tools/build/v1/kcc-tools.html *A* broken link: ../tools/build/v1/kylix-tools.html *A* broken link: ../tools/build/v1/mingw-stlport-tools.html *A* broken link: ../tools/build/v1/mingw-tools.html *A* broken link: ../tools/build/v1/mipspro-tools.html *A* broken link: ../tools/build/v1/msvc-stlport-tools.html *A* broken link: ../tools/build/v1/msvc-tools.html *A* broken link: ../tools/build/v1/sunpro-tools.html *A* broken link: ../tools/build/v1/tru64cxx-tools.html *A* broken link: ../tools/build/v1/vacpp-tools.html *A* broken link: ../tools/build/v1/vc-7_1-stlport-tools.html *A* broken link: ../tools/build/v1/vc-7_1-tools.html *A* broken link: ../tools/build/v1/vc-8_0-tools.html *A* broken link: ../tools/build/v1/vc7-stlport-tools.html *A* broken link: ../tools/build/v1/vc7-tools.html more/version_history.html: *A* broken link: ../tools/build/v1/intel-linux-tools.html *A* broken link: ../tools/build/v1/intel-win32-tools.html *A* broken link: ../tools/build/v1/msvc-stlport-tools.html |mpl| boost/mpl/alias.hpp: *U* unnamed namespace at line 17 |multi_array| boost/multi_array/base.hpp: *U* unnamed namespace at line 69 libs/multi_array/test/generative_tests.hpp: *U* unnamed namespace at line 57 |numeric| libs/numeric/conversion/index.html: *A* broken link: ../../LICENSE_1_0.txt |parameter| libs/parameter/doc/html/python.html: *A* broken link: tag::x(int *A* broken link: tag::y*(int |program_options| libs/program_options/doc/index.html: *A* broken link: ../.../../LICENSE_1_0.txt |ptr_container| libs/ptr_container/doc/tutorial_example.html: *A* unlinked file |python| libs/python/doc/building.html: *A* broken link: ../../../tools/build/v1/build_system.htm *A* broken link: ../../../tools/build/v1/build_system.htm#user_globals *A* broken link: ../../../tools/build/v1/build_system.htm#variants libs/python/doc/tutorial/index.html: *A* broken link: ../../../LICENSE_1_0.txt libs/python/doc/v2/May2002.html: *A* broken link: ../../../../tools/build/v1/build_system.htm *A* broken link: ../../../../tools/build/v1/gen_aix_import_file.py libs/python/doc/v2/faq.html: *A* broken link: ../../../../tools/build/v1/build_system.htm |regex| libs/regex/performance/input.html: *A* unlinked file |regression| regression/.htaccess: *N* leading character of ".htaccess" is not alphabetic tools/regression/index.htm: *A* broken link: build/Jamfile tools/regression/xsl_reports/xsl/html/issues_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/library_developer_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/library_user_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/make_tinyurl.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/summary_developer_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/summary_user_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/issues_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/library_developer_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/library_user_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/make_tinyurl.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/summary_developer_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/summary_user_legend.html: *A* unlinked file |serialization| libs/serialization/src/basic_xml_grammar.ipp: *U* unnamed namespace at line 43 |signals| boost/signals/detail/named_slot_map.hpp: *T* |test| boost/test/floating_point_comparison.hpp: *U* unnamed namespace at line 206 *U* unnamed namespace at line 228 boost/test/impl/cpp_main.ipp: *U* unnamed namespace at line 42 boost/test/impl/exception_safety.ipp: *U* unnamed namespace at line 400 boost/test/impl/framework.ipp: *U* unnamed namespace at line 199 boost/test/impl/plain_report_formatter.ipp: *U* unnamed namespace at line 45 boost/test/impl/progress_monitor.ipp: *U* unnamed namespace at line 38 boost/test/impl/results_collector.ipp: *U* unnamed namespace at line 106 boost/test/impl/results_reporter.ipp: *U* unnamed namespace at line 48 boost/test/impl/unit_test_log.ipp: *U* unnamed namespace at line 79 boost/test/impl/unit_test_monitor.ipp: *U* unnamed namespace at line 35 boost/test/impl/unit_test_parameters.ipp: *U* unnamed namespace at line 50 boost/test/results_collector.hpp: *U* unnamed namespace at line 40 boost/test/test_tools.hpp: *U* unnamed namespace at line 255 boost/test/utils/iterator/token_iterator.hpp: *U* unnamed namespace at line 166 boost/test/utils/named_params.hpp: *U* unnamed namespace at line 216 boost/test/utils/runtime/cla/dual_name_parameter.ipp: *U* unnamed namespace at line 43 boost/test/utils/runtime/cla/modifier.hpp: *U* unnamed namespace at line 34 boost/test/utils/runtime/env/modifier.hpp: *U* unnamed namespace at line 34 boost/test/utils/runtime/file/config_file.hpp: *U* unnamed namespace at line 169 *U* unnamed namespace at line 64 *U* unnamed namespace at line 74 boost/test/utils/runtime/file/config_file_iterator.hpp: *U* unnamed namespace at line 68 boost/test/utils/trivial_singleton.hpp: *U* unnamed namespace at line 52 *U* unnamed namespace at line 61 libs/test/build/msvc71_proj/config_file_iterator_test.vcproj: *N* name exceeds 31 characters libs/test/doc/components/prg_exec_monitor/compilation.html: *A* broken link: ../../../build/Jamfile libs/test/doc/components/prg_exec_monitor/index.html: *A* broken link: ../../../../../boost/test/cpp_main.hpp libs/test/doc/components/test_tools/index.html: *A* broken link: ../../tests/boost_check_equal_str.html libs/test/doc/components/test_tools/reference/BOOST_CHECK_CLOSE.html: *A* broken link: BOOST_CHECK_CLOSE_FRACTION.html libs/test/doc/components/test_tools/reference/BOOST_CHECK_MESSAGE.html: *A* broken link: BOOST_MESSAGE.html libs/test/doc/components/test_tools/reference/BOOST_CHECK_SMALL.html: *A* broken link: BOOST_CHECK_CLOSE_FRACTION.html libs/test/doc/components/test_tools/reference/tools_list.html: *A* broken link: ../../btl1.gif *A* broken link: BOOST_CHECK_CLOSE_FRACTION.html libs/test/doc/components/utf/compilation.html: *A* broken link: ../../../build/Jamfile libs/test/doc/components/utf/components/index.html: *A* broken link: ../../btl1.gif libs/test/doc/components/utf/components/test_case/abstract_interface.html: *A* broken link: ../../../btl1.gif libs/test/doc/components/utf/components/test_case/auto_register_facility.html: *A* broken link: ../../../btl1.gif libs/test/doc/components/utf/components/test_case/boost_function_tc.html: *A* broken link: ../../../../../../../boost/test/unit_test_suite_ex.hpp *A* broken link: ../../../btl1.gif libs/test/doc/components/utf/components/test_case/class_tc.html: *A* broken link: ../../../btl1.gif libs/test/doc/components/utf/components/test_case/function_tc.html: *A* broken link: ../../../btl1.gif 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Boost regression notification (2006-11-16 [RC_1_34_0])
by Douglas Gregor 16 Nov '06

16 Nov '06

Boost Regression test failures Report time: 2006-11-16T12:36:22Z 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… 203 failures in 22 libraries date_time (2) filesystem (1) graph (2) io (1) iostreams (10) iterator (3) lambda (1) math (24) mpl (3) numeric/interval (2) optional (1) parameter (1) python (119) random (1) regex (4) serialization (9) signals (4) spirit (3) statechart (4) test (6) thread (1) utility (1) |date_time| testduration: borland-5.8.2 testgenerators_dll: gcc-4.1.0_linux |filesystem| fstream_test: msvc-6.5 |graph| adj_list_cc: qcc-3.3.5_gpp bfs: intel-linux-9.0 |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 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-8.0 |python| andreas_beyer: msvc-7.0 msvc-8.0 args: msvc-7.0 msvc-8.0 auto_ptr: msvc-7.0 msvc-8.0 back_reference: msvc-7.0 msvc-8.0 ben_scott1: msvc-7.0 msvc-8.0 bienstman1: msvc-7.0 msvc-8.0 bienstman2: msvc-7.0 msvc-8.0 bienstman3: msvc-7.0 msvc-8.0 builtin_converters: msvc-7.0 msvc-8.0 callbacks: msvc-7.0 msvc-8.0 const_argument: msvc-7.0 msvc-8.0 crossmod_exception: msvc-7.0 msvc-8.0 crossmod_opaque: msvc-7.0 msvc-8.0 data_members: msvc-7.0 msvc-8.0 defaults: msvc-7.0 msvc-8.0 dict: msvc-7.0 msvc-8.0 docstring: msvc-7.0 msvc-8.0 enum: msvc-7.0 msvc-8.0 exception_translator: msvc-7.0 msvc-8.0 extract: msvc-7.0 msvc-8.0 implicit: msvc-7.0 msvc-8.0 injected: msvc-7.0 msvc-8.0 iterator: msvc-7.0 msvc-8.0 keywords: msvc-7.0 msvc-8.0 list: msvc-7.0 msvc-8.0 long: msvc-7.0 msvc-8.0 map_indexing_suite: msvc-7.0 msvc-8.0 minimal: msvc-7.0 msvc-8.0 multi_arg_constructor: msvc-7.0 msvc-8.0 nested: msvc-7.0 msvc-8.0 numpy: msvc-7.0 msvc-8.0 object: msvc-7.0 msvc-8.0 opaque: msvc-7.0 msvc-8.0 operators: msvc-7.0 msvc-8.0 pearu1: msvc-7.0 msvc-8.0 pickle1: msvc-7.0 msvc-8.0 pickle2: msvc-7.0 msvc-8.0 pickle3: msvc-7.0 msvc-8.0 pickle4: msvc-7.0 msvc-8.0 pointer_vector: msvc-7.0 msvc-8.0 polymorphism: msvc-7.0 msvc-8.0 polymorphism2: msvc-7.0 msvc-8.0 polymorphism2_auto_ptr: darwin-4.0.1 intel-vc8-win-9.1 msvc-6.5 msvc-7.0 msvc-8.0 properties: msvc-7.0 msvc-8.0 raw_ctor: msvc-7.0 msvc-8.0 return_arg: msvc-7.0 msvc-8.0 shared_ptr: msvc-7.0 msvc-8.0 slice: msvc-7.0 msvc-8.0 staticmethod: msvc-7.0 msvc-8.0 stl_iterator: msvc-7.0 msvc-8.0 str: msvc-7.0 msvc-8.0 test_pointer_adoption: msvc-7.0 msvc-8.0 try: msvc-7.0 msvc-8.0 tuple: msvc-7.0 msvc-8.0 vector_indexing_suite: msvc-7.0 msvc-8.0 virtual_functions: msvc-7.0 msvc-8.0 voidptr: msvc-7.0 msvc-8.0 wrapper_held_type: msvc-7.0 msvc-8.0 |random| random_test: intel-linux-9.0 |regex| regex_regress: borland-5.8.2 regex_regress_dll: borland-5.8.2 regex_regress_threaded: borland-5.8.2 test_grep: msvc-6.5 |serialization| test_derived_class_binary_archive_dll: msvc-8.0 test_null_ptr_text_warchive_dll: msvc-8.0 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| switch_tests_single_debug: intel-linux-9.0 symbols_add_null: msvc-7.1 symbols_add_null_debug: msvc-7.1 |statechart| TransitionTestBoth: qcc-3.3.5_gpp qcc-3.3.5_gpp TransitionTestRelaxed: qcc-3.3.5_gpp qcc-3.3.5_gpp |test| boost_check_equal_str: borland-5.8.2 msvc-7.1 test_case_template_test: borland-5.8.2 test_fp_comparisons: cw-9.4 test_tools_test: borland-5.8.2 msvc-7.1 |thread| test_tss_lib: borland-5.8.2 |utility| operators_test: gcc-3.4.5_linux_x86_64

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Re: [boost] I think using spinlocks to simulate an atomicshared_ptr...
by Talbot, George 16 Nov '06

16 Nov '06

Thanks for looking at that. I was also thinking--does enable_shared_from_this need to have an "enable_atomic_from_this" version? That would also imply an atomic_weak type. -- 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: Wednesday, November 15, 2006 11:42 AM > To: boost(a)lists.boost.org > Subject: Re: [boost] I think using spinlocks to simulate an > atomicshared_ptr... > > Sorry for the brief response, no time... > > Talbot, George wrote: > > > 2) Without any sort of 2-pointer-wide atomic assignment in hardware, > > operator= really looks like this: > > > > lock the source pointer > > make a local copy of it > > release the source pointer > > > > lock the destination > > set the value of the destination from the copy > > unlock the destination > > > > This won't deadlock, but has to make an extra copy of the pointer > > locally. > > There's no extra copy. shared_ptr::operator= does: > > shared_ptr( r ).swap( *this ); > > and the above does: > > lock source > shared_ptr tmp( src ); > unlock > > lock dest > dest.swap( tmp ); > unlock > > so the two are equivalent (modulo spinlock order). > > _______________________________________________ > Unsubscribe & other changes: > http://lists.boost.org/mailman/listinfo.cgi/boost

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