- Boost - lists.boost.org

Do we need BoostBook?
by Vladimir Prus 09 Dec '14

09 Dec '14

Hi, I've noticed that Boost.Build documentation, created with BoostBook, explicitly sets a small, and IMO unreadable, font, so I went to fix that, and some other things, as shown at: http://goo.gl/VWYh2P However, after a few easy tweaks, I'm stuck at the fact that BoostBook/DocBook produces fairly old-fashioned HTML. For example, the Boost logo at top is actually a table, and the "tip" block is also a table, which makes tweaking the layout with CSS quite a bit more complex. Also, some of the conceptually trivial things, like putting some front matter in index.html, appear to require XSLT customization. As heretic as it sounds, do we get any benefits from BoostBook? It's a complex vocabulary, with complex toolchain, and while PDF generation sounded nice 10 years ago, printing HTML into PDF is a viable option these days - and nobody would want to print entire Boost documentation anyway? Thoughts? -- Vladimir Prus CodeSourcery / Mentor Embedded http://vladimirprus.com

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[RFC][Patch][Boost.context] Allowing alternative context switch API
by microcai 09 Dec '14

09 Dec '14

Hi Oliver Kowalke, and others last weak, I report a bug that boost.context causes LoadLibrary to fail. And Oliver Kowalke response that might be because boost.context didn't swap all TIB parts. Allowing alternative context switch API other than reverse-engineered boost.context might solve the problem. So I speed some time to write the patch. users that wish to use Win32 API shoul define BOOST_COROUTINE_USE_FIBER then users should be responsibe to make sure all threads that might call coroutine must be converted to fiber first. since IsThreadAFIber() is not available on some windows platform. if the user can make 100% sure that the platform he/she wish to support has IsThreadAFIber(), then define BOOST_COROUTINE_USE_IS_THREAD_A_FIBER and boost.coroutine will take care of converting to fiber and converting back to thread. Best regards. --- >From 11668b6641c877a4ea154d51ad2171483eced921 Mon Sep 17 00:00:00 2001 From: microcai <microcaicai(a)gmail.com> Date: Sat, 6 Dec 2014 15:50:46 +0800 Subject: [PATCH] allow Win32 Fiber as alternative context switch API windows has some undocumented TIB parts, as boost.context can't keep 100% compatibility with all windows versions, and coroutine is essential to many building blocks. It has to be stable, to allowing alternative context switch API can be more use full. --- .../boost/coroutine/detail/coroutine_context.hpp | 11 ++++ .../coroutine/detail/pull_coroutine_object.hpp | 9 ++++ .../coroutine/detail/push_coroutine_object.hpp | 9 ++++ include/boost/coroutine/stack_allocator.hpp | 5 ++ .../coroutine/windows/null_stack_allocator.hpp | 53 +++++++++++++++++++ src/detail/coroutine_context.cpp | 60 ++++++++++++++++++++-- 6 files changed, 142 insertions(+), 5 deletions(-) create mode 100644 include/boost/coroutine/windows/null_stack_allocator.hpp diff --git a/include/boost/coroutine/detail/coroutine_context.hpp b/include/boost/coroutine/detail/coroutine_context.hpp index 6c4ebb6..f6a53e2 100644 --- a/include/boost/coroutine/detail/coroutine_context.hpp +++ b/include/boost/coroutine/detail/coroutine_context.hpp @@ -16,6 +16,9 @@ #include <boost/coroutine/detail/config.hpp> #include <boost/coroutine/stack_context.hpp> +#ifdef BOOST_COROUTINE_USE_FIBER +# include <windows.h> +#endif #ifdef BOOST_HAS_ABI_HEADERS # include BOOST_ABI_PREFIX #endif @@ -31,6 +34,12 @@ class BOOST_COROUTINES_DECL coroutine_context private: stack_context stack_ctx_; context::fcontext_t ctx_; +#ifdef BOOST_COROUTINE_USE_FIBER + void (*fn_)(intptr_t); + intptr_t param_; + LPVOID fiber_; + static VOID WINAPI fb_start_proc(LPVOID lpFiberParameter); +#endif // BOOST_COROUTINE_USE_FIBER public: typedef void( * ctx_fn)( intptr_t); @@ -51,6 +60,8 @@ public: stack_context & stack_ctx() { return stack_ctx_; } + + void destory(); }; }}} diff --git a/include/boost/coroutine/detail/pull_coroutine_object.hpp b/include/boost/coroutine/detail/pull_coroutine_object.hpp index cfe34bd..d15d94f 100644 --- a/include/boost/coroutine/detail/pull_coroutine_object.hpp +++ b/include/boost/coroutine/detail/pull_coroutine_object.hpp @@ -65,6 +65,9 @@ private: stack_context stack_ctx( obj->stack_ctx_); StackAllocator stack_alloc( obj->stack_alloc_); obj->unwind_stack(); +#ifdef BOOST_COROUTINE_USE_FIBER + obj->callee.destory(); +#endif obj->~obj_t(); stack_alloc.deallocate( stack_ctx); } @@ -153,6 +156,9 @@ private: stack_context stack_ctx( obj->stack_ctx_); StackAllocator stack_alloc( obj->stack_alloc_); obj->unwind_stack(); +#ifdef BOOST_COROUTINE_USE_FIBER + obj->callee.destory(); +#endif obj->~obj_t(); stack_alloc.deallocate( stack_ctx); } @@ -241,6 +247,9 @@ private: stack_context stack_ctx( obj->stack_ctx_); StackAllocator stack_alloc( obj->stack_alloc_); obj->unwind_stack(); +#ifdef BOOST_COROUTINE_USE_FIBER + obj->callee.destory(); +#endif obj->~obj_t(); stack_alloc.deallocate( stack_ctx); } diff --git a/include/boost/coroutine/detail/push_coroutine_object.hpp b/include/boost/coroutine/detail/push_coroutine_object.hpp index 1a39c07..b41a3b2 100644 --- a/include/boost/coroutine/detail/push_coroutine_object.hpp +++ b/include/boost/coroutine/detail/push_coroutine_object.hpp @@ -77,6 +77,9 @@ private: stack_context stack_ctx( obj->stack_ctx_); StackAllocator stack_alloc( obj->stack_alloc_); obj->unwind_stack(); +#ifdef BOOST_COROUTINE_USE_FIBER + obj->callee.destory(); +#endif obj->~obj_t(); stack_alloc.deallocate( stack_ctx); } @@ -165,6 +168,9 @@ private: stack_context stack_ctx( obj->stack_ctx_); StackAllocator stack_alloc( obj->stack_alloc_); obj->unwind_stack(); +#ifdef BOOST_COROUTINE_USE_FIBER + obj->callee.destory(); +#endif obj->~obj_t(); stack_alloc.deallocate( stack_ctx); } @@ -253,6 +259,9 @@ private: stack_context stack_ctx( obj->stack_ctx_); StackAllocator stack_alloc( obj->stack_alloc_); obj->unwind_stack(); +#ifdef BOOST_COROUTINE_USE_FIBER + obj->callee.destory(); +#endif obj->~obj_t(); stack_alloc.deallocate( stack_ctx); } diff --git a/include/boost/coroutine/stack_allocator.hpp b/include/boost/coroutine/stack_allocator.hpp index 662533e..811f352 100644 --- a/include/boost/coroutine/stack_allocator.hpp +++ b/include/boost/coroutine/stack_allocator.hpp @@ -14,6 +14,9 @@ #include <boost/context/detail/config.hpp> #include <boost/coroutine/segmented_stack_allocator.hpp> #include <boost/coroutine/standard_stack_allocator.hpp> +#if defined(BOOST_WINDOWS) +# include <boost/coroutine/windows/null_stack_allocator.hpp> +#endif #ifdef BOOST_HAS_ABI_HEADERS # include BOOST_ABI_PREFIX @@ -24,6 +27,8 @@ namespace coroutines { #if defined(BOOST_USE_SEGMENTED_STACKS) typedef segmented_stack_allocator stack_allocator; +#elif defined(BOOST_COROUTINE_USE_FIBER) +typedef null_stack_allocator stack_allocator; #else typedef standard_stack_allocator stack_allocator; #endif diff --git a/include/boost/coroutine/windows/null_stack_allocator.hpp b/include/boost/coroutine/windows/null_stack_allocator.hpp new file mode 100644 index 0000000..25f9b34 --- /dev/null +++ b/include/boost/coroutine/windows/null_stack_allocator.hpp @@ -0,0 +1,53 @@ + +// Copyright Oliver Kowalke 2009. +// 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 BOOST_COROUTINES_NULL_STACK_ALLOCATOR_H +#define BOOST_COROUTINES_NULL_STACK_ALLOCATOR_H + +extern "C" { +#include <windows.h> +} + +#include <cmath> +#include <cstddef> +#include <new> + +#include <boost/config.hpp> + +#include <boost/coroutine/detail/config.hpp> +#include <boost/coroutine/stack_traits.hpp> + +#ifdef BOOST_HAS_ABI_HEADERS +# include BOOST_ABI_PREFIX +#endif + +namespace boost { +namespace coroutines { + +struct stack_context; + +template< typename traitsT > +struct basic_null_stack_allocator +{ + typedef traitsT traits_type; + + void allocate(stack_context & ctx, std::size_t size) + {} + + void deallocate(stack_context & ctx) + {} +}; + +typedef basic_null_stack_allocator< stack_traits > null_stack_allocator; + +} +} + +#ifdef BOOST_HAS_ABI_HEADERS +# include BOOST_ABI_SUFFIX +#endif + +#endif // BOOST_COROUTINES_NULL_STACK_ALLOCATOR_H diff --git a/src/detail/coroutine_context.cpp b/src/detail/coroutine_context.cpp index f63479e..e021281 100644 --- a/src/detail/coroutine_context.cpp +++ b/src/detail/coroutine_context.cpp @@ -28,6 +28,14 @@ void __splitstack_setcontext( void * [BOOST_COROUTINES_SEGMENTS]); namespace boost { namespace coroutines { namespace detail { +#ifdef BOOST_COROUTINE_USE_FIBER +VOID WINAPI coroutine_context::fb_start_proc(LPVOID lpFiberParameter) +{ + coroutine_context * ctx = (coroutine_context*)lpFiberParameter; + ctx->fn_(ctx->param_); + DeleteFiber(ctx->fiber_); +} +#endif coroutine_context::coroutine_context() : stack_ctx_(), @@ -35,18 +43,35 @@ coroutine_context::coroutine_context() : { #if defined(BOOST_USE_SEGMENTED_STACKS) __splitstack_getcontext( stack_ctx_.segments_ctx); +#elif defined(BOOST_COROUTINE_USE_FIBER) + fiber_ = NULL; + param_ = 0; + fn_ = 0; #endif } coroutine_context::coroutine_context( ctx_fn fn, stack_context const& stack_ctx) : - stack_ctx_( stack_ctx), - ctx_( context::make_fcontext( stack_ctx_.sp, stack_ctx_.size, fn) ) -{} + stack_ctx_( stack_ctx) +#ifndef BOOST_COROUTINE_USE_FIBER + , ctx_(context::make_fcontext( stack_ctx_.sp, stack_ctx_.size, fn) ) +#endif // !BOOST_COROUTINE_USE_FIBER +{ +#ifdef BOOST_COROUTINE_USE_FIBER + fn_ = fn; + fiber_ = CreateFiber(0, fb_start_proc, this); +#endif // BOOST_COROUTINE_USE_FIBER +} coroutine_context::coroutine_context( coroutine_context const& other) : stack_ctx_( other.stack_ctx_), ctx_( other.ctx_) -{} +{ +#ifdef BOOST_COROUTINE_USE_FIBER + real_fn = other.real_fn; + fiber_ = other.fiber_; + param_ = other.param_; +#endif // BOOST_COROUTINE_USE_FIBER +} coroutine_context & coroutine_context::operator=( coroutine_context const& other) @@ -55,7 +80,11 @@ coroutine_context::operator=( coroutine_context const& other) stack_ctx_ = other.stack_ctx_; ctx_ = other.ctx_; - +#ifdef BOOST_COROUTINE_USE_FIBER + real_fn = other.real_fn; + fiber_ = other.fiber_; + param_ = other.param_; +#endif // BOOST_COROUTINE_USE_FIBER return * this; } @@ -71,11 +100,32 @@ coroutine_context::jump( coroutine_context & other, intptr_t param, bool preserv __splitstack_setcontext( stack_ctx_.segments_ctx); return ret; +#elif BOOST_COROUTINE_USE_FIBER + other.param_ = param; +#ifdef BOOST_COROUTINE_USE_IS_THREAD_A_FIBER + if (!IsThreadAFiber()) + { + this->fiber_ = ConvertThreadToFiber(this); + SwitchToFiber(other.fiber_); + ConvertFiberToThread(); + this->fiber_ = NULL; + } + else +#endif // BOOST_COROUTINE_USE_IS_THREAD_A_FIBER + SwitchToFiber(other.fiber_); + return this->param_; #else return context::jump_fcontext( & ctx_, other.ctx_, param, preserve_fpu); #endif } +void coroutine_context::destory() +{ +#ifdef BOOST_COROUTINE_USE_FIBER + DeleteFiber(fiber_); +#endif +} + }}} #if defined(_MSC_VER) -- 2.2.0

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What is the e-mail of the Boost webmaster ?
by Edward Diener 08 Dec '14

08 Dec '14

What is the e-mail of the Boost webmaster, as in "If you want to do some XXX on the Boost website, contact the Boost webmaster" ? The term "Boost webmaster" is used on the development portion of the website with no clue who that might be.

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[serialization] Fwd: [Boost-testing] Develop Tests Failing Again
by Rene Rivera 08 Dec '14

08 Dec '14

---------- Forwarded message ---------- From: Tom Kent <teeks99(a)yahoo.com> Date: Mon, Dec 8, 2014 at 2:09 PM Subject: [Boost-testing] Develop Tests Failing Again To: Running Boost regression tests <boost-testing(a)lists.boost.org> It looks like my windows and linux tests have been failing since last saturday, around 4pm pacific time. The end of results/bjam.log is as follows: boost-test(RUN) "serialization/test_helper_ support_xml_warchive" : "libs/serialization/test/test_helper_support.cpp" error: at D:/local/teeks99-08/a/boost_bb/src/kernel\modules.jam:107 error: Unable to find file or target named error: 'test_interrupts.cpp' error: referred to from project at error: '../libs/serialization/test' Tom _______________________________________________ Boost-Testing mailing list Boost-Testing(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-testing -- -- Rene Rivera -- Grafik - Don't Assume Anything -- Robot Dreams - http://robot-dreams.net -- rrivera/acm.org (msn) - grafikrobot/aim,yahoo,skype,efnet,gmail

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[graph] Lowest common ancestor (LCA), etc.
by Jeremy Murphy 08 Dec '14

08 Dec '14

Hi, I'm working on some graph algorithms that I thought might be useful additions to Boost.Graph, such as the classic LCA and more recent lowest single common ancestor (LSCA) [1]. Is there interest in having these added? I saw there was some discussion of LCA between Cromwell Enage and others back in 2004 but I'm unaware of the outcome (in terms of proposed code, etc). Cheers. Jeremy [1] https://github.com/jeremy-murphy/graph-algorithms

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How to contact test runner "trippels_gcc-5.0_c++11"
by Antony Polukhin 08 Dec '14

08 Dec '14

Hi, There's a GCC bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64218 that would possibly require some comments from test runner. Somebody knows how to contact test runner trippels_gcc-5.0? -- Best regards, Antony Polukhin

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[mpl] [build] [testing] Merge pull requests
by Andrey Semashev 08 Dec '14

08 Dec '14

Hi, There were a lot of discussions about MPL recently, and I created a few pull requests to address issues: https://github.com/boostorg/boost/pull/39 Invoke 'headers' target before building testing tools. Note that several testers are currently failing to run because of this problem. Since this affects the testing process, I'd appreciate if someone familiar with it could take a look. https://github.com/boostorg/boost/pull/38 Add MPL.Core tests to the test report. These tests are currently not run by testers. https://github.com/boostorg/mpl/pull/12 Move a misplaced header from MPL to MPL.Core to resolve circular dependency between the two. I believe the first PR is especially critical. Could someone with permissions merge these? Thanks.

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[quickbook] Where to put my pictures?
by Andrzej Krzemienski 05 Dec '14

05 Dec '14

Hi Everyone, How do I put images into QuickBook documentation? The manual says I should put: [$images/img.png] But in which location am I supposed to put the picture? Currently my documentation works if I put folder "images" with my PNG image inside folder "html". But the latter folder ("html") is generated by b2: it would not be there if I haven't run b2. Assuming I only want to keep QBK sources, but no generated files, where do I put my images, so that b2 works? Regards, &rzej

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Re: [boost] [optional] operator<(optional<T>, T) -- is it wrong?
by Felix Uhl 05 Dec '14

05 Dec '14

David Stone wrote: >I have been bitten in the past by operator<. I was converting code that >used unsigned with a 'magic value' to represent nullness to >boost::optional<std::uint32_t>. However, the maximum value it used was >std::numeric_limits<std::uint32_t>:max(). A simple find and replace for >this magic constant (which was referred to everywhere as DWORD_NULL) with >boost::none and fixing compile errors led to some erroneous code. We had >code that assumed an 'uninitialized' std::uint32_t was greater than any >valid value. >The concept of "value not present" is not inherently less-than or >greater-than any value, but because of operator<, code compiled that >shouldn't have. I suppose this is really an argument against any operator< >overload, not just the mixed-type comparison. I don't expect this to be a >major problem for new code, but there is a lot of code out there that uses >a magic value, and that is what optional is supposed to replace. I was irritated by it at first, too, and if you think about it the comparison brakes down to a philosophical problem: If I have a pair of pants and you don’t, are my pants smaller than yours? Hard to say, but to me the most logical solution is “no”. My pants aren’t smaller than yours, and my pants aren’t larger than yours. Also, your and my logic would apply to both the operator<(optional<T>, T) and operator<(optional<T>, optional<T>), but I think we’re only talking about the latter. --- Felix Uhl

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[spinlock] Spin on volatile read, NUMA fairness?
by Benedek Thaler 05 Dec '14

05 Dec '14

Hi All, Niall, 1) I was reading this Intel paper [0], and this section grabbed my attention: "One common mistake made by developers developing their own spin-wait loops is attempting to spin on an atomic instruction instead of spinning on a volatile read. Spinning on a dirty read instead of attempting to acquire a lock consumes less time and resources. This allows an application to only attempt to acquire a lock only when it is free." As I can tell by looking at the source code, spinlock spins on atomic consume. I wonder if a volatile read would produce better performance characteristic? 2) AFAIK spinlocking is not necessarily fair on a NUMA architecture. Is there something already implemented or planned in Boost.Spinlock to ensure fairness? I'm thinking of something like this: [1] Thanks, Benedek [0]: https://software.intel.com/en-us/articles/implementing-scalable-atomic-lock… [1]: http://www.google.com/patents/US7334102

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