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boost.atomic and boost.lockfree backports
by Bryce Lelbach 30 May '11

30 May '11

Hartmut and I have been using modified versions of Boost.Lockfree and Boost.Atomic in our codebase at work. I've put git repositories of our versions of both libraries up on github, so that the lockfree/atomic authors can integrate our bug fixes and/or feature extensions if they wish. The code is under the BSL. In addition to a number of bug fixes/tweaks, our variants contain the following enhancements: * boost.atomic: 128bit lockfree atomics for MSVC 2008+ (using _InterlockedCompareExchange128 and SSE2 intrinsics) and GCC-compatible POSIX compilers (using 16 byte __sync intrinsics). This code is x86-64 specific, and disabled by default. Define BOOST_ATOMIC_HAVE_SSE2 to enable in x86-64 MSVC 2008+ environments. Define BOOST_ATOMIC_HAVE_SSE2, BOOST_ATOMIC_HAVE_GNU_SYNC_16 and BOOST_ATOMIC_HAVE_GNU_ALIGNED_16 to enable for GCC-compatible compilers. The following command line flags are also needed for GCC-compatible compilers: -mcx16 (enables 16byte sync intrinsics) and -msse2. * boost.lockfree: A growable lockfree deque, based on algorithms by M. M. Michael. Backed by 128bit atomics. This is the first lockfree data structure I've written, so take it with a grain of salt. There's one bug that I'm aware of, unfortunately, it occurs infrequently so I haven't had much luck tracking it down. Links: https://github.com/brycelelbach/boost.atomic https://github.com/brycelelbach/boost.lockfree P.S. I don't have a list of the specific bug fixes on hand, I'll have to go through the SVN logs for that. The only non-trivial one that I know of is the problem with intel-linux that I found and fixed (intel doesn't define *amd64* macros, and they were used for x86-64 bit detection). -- Bryce Lelbach aka wash boost-spirit.com px.cct.lsu.edu github.com/lll-project

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[profile_templates] template profiling on darwin
by Gordon Woodhull 29 May '11

29 May '11

Hey Steven, Thanks for your help getting the template profiler working on darwin. I just had to make a couple more obvious config copy/pastes to get this working - my diffs are below. Also, it appears that the tool is broken for gcc < 4.3 - it looks like some changes were made halfway for template_profiler_test{_enter|_exit} but still some undefined references to template_profiler_test. I mucked about with this for a few minutes, then gave up and upgraded to gcc 4.5, updated my simlinks, and darwin configuration works ok now. Now I've got LOTS of data to wade through (65K template instantiations for a very small MSM test!) Thanks again, Gordon Index: template-profile.jam =================================================================== --- template-profile.jam (revision 72066) +++ template-profile.jam (working copy) @@ -53,6 +53,22 @@ } +module darwin { + import template-profile : init-toolset ; + template-profile.init-toolset darwin ; + + actions compile.c++.preprocess { + $(CONFIG_COMMAND) $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -E "$(>)" | $(INSTRUMENT-ACTION) >"$(<)" + } + + actions compile.c++.template-profile { + "$(CONFIG_COMMAND)" $(LANG) -ftemplate-depth-$(TEMPLATE_DEPTH) $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -D PROFILE_TEMPLATES -I"$(INCLUDES)" -c "$(>:W)" 2>&1 | "$(FILTER)" $(FILTER-OPTIONS) >"$(<)" + } +} + +IMPORT gcc : compile.c++.preprocess : darwin : compile.c++.preprocess ; +IMPORT gcc : compile.c++.template-profile : darwin : compile.c++.template-profile ; + module msvc { import template-profile : init-toolset ; @@ -88,6 +104,8 @@ toolset = msvc ; case gcc* : toolset = gcc ; + case darwin* : + toolset = darwin ; case * : errors.error unrecognized toolset $(toolset) ; } @@ -124,6 +142,7 @@ generators.register [ class.new warn-generator msvc.compile.c++.template-profile : INSTRUMENTED_TEMPLATE_PREPROCESSED_CPP : RAW_TEMPLATE_PROFILE : <toolset>msvc ] ; generators.register [ class.new warn-generator gcc.compile.c++.template-profile : INSTRUMENTED_TEMPLATE_PREPROCESSED_CPP : RAW_TEMPLATE_PROFILE : <toolset>gcc ] ; +generators.register [ class.new warn-generator darwin.compile.c++.template-profile : INSTRUMENTED_TEMPLATE_PREPROCESSED_CPP : RAW_TEMPLATE_PROFILE : <toolset>darwin ] ; class final-profile-generator : generator {

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[type_erasure] default implementation of concept signatures
by Vicente Botet 28 May '11

28 May '11

Hi Steve, Concepts are able to define default implementations if the type doesn't provides the specific signature. For example in 20.1.2 Comparisons the concept LessThanComparable defines a default for implementation for bool operator>(U const& a, T const& b) { return b < a; } bool operator<=(U const& a, T const& b) { return !(b < a); } bool operator>=(T const& a, U const& b) { return !(a < b); } In the definition of the concept less_than_comparable in Boost.Any, you define the implementation of these operators in function of operator<(), but if the types provide the specific signature the specific function is not called. I guess that the default implementation of for example operator<= should use operator< only if the the underlying types don't provide operator<=. What do you think? Best, Vicente -- View this message in context: http://boost.2283326.n4.nabble.com/type-erasure-default-implementation-of-c… Sent from the Boost - Dev mailing list archive at Nabble.com.

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[1.47.0] Release schedule
by Beman Dawes 28 May '11

28 May '11

* Monday, June 6: branches/release closed for all changes, except by permission of a release manager. * Monday, June 13: branches/release frozen. Only release managers may commit. Once tests have cycled and the release managers are satisfied with stability, release candidates for the beta will be generated. * Monday, Jun 20: Beta release target date. See June in http://www.boost.org/development/index.html or https://www.google.com/calendar/embed?src=5rorfm42nvmpt77ac0vult9iig@group.… The final release date won't be set until later in the process. Thanks, --Beman

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'unnamed_Path' was not declared in this scope
by Ilya Chernykh 28 May '11

28 May '11

Hi! While building a package against boost I receive the following message: /usr/include/boost/filesystem/v2/operations.hpp: In function 'Path boost::filesystem2::current_path()': /usr/include/boost/filesystem/v2/operations.hpp:534:14: error: 'unnamed_Path' was not declared in this scope Is this an error in boost and how can I overcome it?

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[gsoc] heap review
by Tim Blechmann 28 May '11

28 May '11

hi all, during this `summer of code', i will do the review of two proposed libraries, boost.lockfree and boost.heap. the boost.heap review will be the first one, taking place from may 30th to june 8th. boost.heap is an implementation of different priority queue data structures. they can be found at: tarball: http://tim.klingt.org/git?p=boost_heap.git;a=snapshot;h=HEAD;sf=tgz git repository: git://tim.klingt.org/boost_heap.git documentation: http://tim.klingt.org/boost_heap/ there will be a `formal' review announcement, i want to invite people to check out code, examples and documentation ... cheers, tim -- tim(a)klingt.org http://tim.klingt.org Question: Then what is the purpose of this "experimental" music? Answer: No purposes. Sounds. John Cage

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[Block Pointer] benchmark
by Phil Bouchard 27 May '11

27 May '11

Hi, Just for the records I have benchmarked block_ptr using: https://svn.boost.org/svn/boost/sandbox/block_ptr/libs/smart_ptr/example/be… And I get the following: auto_ptr: 9208870 ns shared_ptr: 22958516 ns block_ptr: 75860365 ns Which is pretty good given the complexity it goes thru. I was wondering if there is any hope in having a pool::ordered_malloc() call of O(1) instead of O(n) and a faster pool::is_from()? The latter could be just a check to see if a pointer is within reserved memory pages of the pool. I tried to talk to the author of pool but I got no response. Thanks, -Phil

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[release] 1.4.7
by Thomas Heller 27 May '11

27 May '11

Hi, Now that boostcon is over, what are the dates for 1.47? Thanks, Thomas

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boost.move?
by Bryce Lelbach 27 May '11

27 May '11

Has been Boost.Move been accepted already? If so, can we squeeze it in for the next Boost release? -- Bryce Lelbach aka wash boost-spirit.com px.cct.lsu.edu github.com/lll-project

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Boost Steering Committee
by Beman Dawes 27 May '11

27 May '11

There was a special session Friday morning at BoostCon 2011 to announce the formation of a Boost Steering Committee. The slides from that session have been annotated to make them more comprehensible to those not present. See http://tinyurl.com/3l27o3q (There is also a link on steering.boost.org, but DNS isn't resolving that yet for me. Instead use https://sites.google.com/a/boost.org/steering/) We haven't yet decided anything beyond what is on the slides, so it will take a bit of time before details emerge. As the slides mention, the first job of the steering committee is to design of its own operating procedures and policies. Input from the Boost community will help form those procedures and policies. The steering committee is an important change in the way Boost operates! We hope it will position Boost to continue to grow and prosper. --The Boost Steering Committee Beman Dawes Dave Abrahams Hartmut Kaiser Jeff Garland Jon Kalb Marshall Clow Robert Stewart Steven Wantanabe

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