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How to use interprocess communication to load the data into map
by manish4gupta 17 Sep '09

17 Sep '09

Hi, I am using boost interprocess library for loading the data into map <string, string> . And reading the same map with another program.I am benchmarking the code given on the following lilnk. http://www.boost.org/doc/libs/1_38_0/doc/html/interproc/quick_guide.html#in… #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/interprocess/containers/map.hpp> #include <boost/interprocess/allocators/allocator.hpp> #include <functional> #include <utility> int main () { using namespace boost::interprocess; //Shared memory front-end that is able to construct objects //associated with a c-string. Erase previous shared memory with the name //to be used and create the memory segment at the specified address and initialize resources shared_memory_object::remove("MySharedMemory"); try{ managed_shared_memory segment (create_only ,"MySharedMemory" //segment name ,65536); //segment size in bytes //Note that map<Key, MappedType>'s value_type is std::pair<const Key, MappedType>, //so the allocator must allocate that pair. typedef int KeyType; typedef float MappedType; typedef std::pair<const int, float> ValueType; //Alias an STL compatible allocator of for the map. //This allocator will allow to place containers //in managed shared memory segments typedef allocator<ValueType, managed_shared_memory::segment_manager> ShmemAllocator; //Alias a map of ints that uses the previous STL-like allocator. //Note that the third parameter argument is the ordering function //of the map, just like with std::map, used to compare the keys. typedef map<KeyType, MappedType, std::less<KeyType>, ShmemAllocator> MyMap; //Initialize the shared memory STL-compatible allocator ShmemAllocator alloc_inst (segment.get_segment_manager()); //Construct a shared memory map. //Note that the first parameter is the comparison function, //and the second one the allocator. //This the same signature as std::map's constructor taking an allocator MyMap *mymap = segment.construct<MyMap>("MyMap") //object name (std::less<int>() //first ctor parameter ,alloc_inst); //second ctor parameter //Insert data in the map for(int i = 0; i < 100; ++i){ mymap->insert(std::pair<const int, float>(i, (float)i)); } } catch(...){ shared_memory_object::remove("MySharedMemory"); throw; } shared_memory_object::remove("MySharedMemory"); return 0; } but getting the following errors. manish@user-desktop:~/Desktop$ g++ memorymap.cpp /tmp/ccmOQCB8.o: In function `boost::interprocess::shared_memory_object::priv_open_or_create(boost::interprocess::detail::create_enum_t, char const*, boost::interprocess::mode_t)': memorymap.cpp:(.text._ZN5boost12interprocess20shared_memory_object19priv_open_or_createENS0_6detail13create_enum_tEPKcNS0_6mode_tE[boost::interprocess::shared_memory_object::priv_open_or_create(boost::interprocess::detail::create_enum_t, char const*, boost::interprocess::mode_t)]+0x163): undefined reference to `shm_open' /tmp/ccmOQCB8.o: In function `boost::interprocess::detail::mutexattr_wrapper::mutexattr_wrapper(bool)': memorymap.cpp:(.text._ZN5boost12interprocess6detail17mutexattr_wrapperC1Eb[boost::interprocess::detail::mutexattr_wrapper::mutexattr_wrapper(bool)]+0x14): undefined reference to `pthread_mutexattr_init' memorymap.cpp:(.text._ZN5boost12interprocess6detail17mutexattr_wrapperC1Eb[boost::interprocess::detail::mutexattr_wrapper::mutexattr_wrapper(bool)]+0x2b): undefined reference to `pthread_mutexattr_setpshared' memorymap.cpp:(.text._ZN5boost12interprocess6detail17mutexattr_wrapperC1Eb[boost::interprocess::detail::mutexattr_wrapper::mutexattr_wrapper(bool)]+0x4d): undefined reference to `pthread_mutexattr_settype' /tmp/ccmOQCB8.o: In function `boost::interprocess::detail::mutexattr_wrapper::~mutexattr_wrapper()': memorymap.cpp:(.text._ZN5boost12interprocess6detail17mutexattr_wrapperD1Ev[boost::interprocess::detail::mutexattr_wrapper::~mutexattr_wrapper()]+0xd): undefined reference to `pthread_mutexattr_destroy' /tmp/ccmOQCB8.o: In function `boost::interprocess::shared_memory_object::remove(char const*)': memorymap.cpp:(.text._ZN5boost12interprocess20shared_memory_object6removeEPKc[boost::interprocess::shared_memory_object::remove(char const*)]+0x33): undefined reference to `shm_unlink' collect2: ld returned 1 exit stats. What is the reason for this pblm? Thanks in advance. Regards Manish -- View this message in context: http://www.nabble.com/How-to-use-interprocess-communication-to-load-the-dat… Sent from the Boost - Users mailing list archive at Nabble.com.

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boost::Interprocess sharing objects using virtual inheritance
by Martin Kaiser 16 Sep '09

16 Sep '09

hi, I am currently developing an API for PCI devices. Multiple processes should be able to use the API simultaniously, but there may be only one instance of the API and all processes have to use that same instance. So I decided to use a shared memory with a vector containing all instances of the PCI device Objects. The Problem is that my PCI Device Object uses virtual inheritance and the doc of boost::interprocess says that it isn't possible (see below). Now I am wondering if it's possible to store an offset_ptr or a kind of Ownership smart pointer in that vector pointing to my virtual inherited Device Object in a Managed Memory Segment (not memory mapped region!). Can anybode give me a hint on this? Thank in regards Martin from http://www.boost.org/doc/libs/1_39_0/doc/html/interprocess/sharedmemorybetw… : Virtuality forbidden The virtual table pointer and the virtual table are in the address space of the process that constructs the object, so if we place a class with a virtual function or virtual base class, the virtual pointer placed in shared memory will be invalid for other processes and they will crash. This problem is very difficult to solve, since each process needs a different virtual table pointer and the object that contains that pointer is shared across many processes. Even if we map the mapped region in the same address in every process, the virtual table can be in a different address in every process. To enable virtual functions for objects shared between processes, deep compiler changes are needed and virtual functions would suffer a performance hit. That's why Boost.Interprocess does not have any plan to support virtual function and virtual inheritance in mapped regions shared between processes.

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cannot pass objects of non-POD type ‘class boost::detail::shared_count’ through ‘...’; call will abort at runtime
by Dave Steffen 16 Sep '09

16 Sep '09

Hi Folks Just tried to compile my project with GCC 4.3 and Boost 1.40. (It compiles and works just fine with Boost 1.38.) As part of a home-built thread-locking shared pointer thing, we have this code: /// Constructor from pointer to complete type template<class Y> explicit shared_locking_ptr( Y * p ): px( p ), pn( p ) // Y must be complete { boost::detail::sp_enable_shared_from_this( pn, p, p ); } which now produces this result: ../util/thread/shared_locking_ptr.hpp:57:9: warning: cannot pass objects of non-POD type ‘class boost::detail::shared_count’ through ‘...’; call will abort at runtime In Boost 1.38, the relevent code in shared_ptr.hpp was this AFAICT: #ifdef _MANAGED [ ... ] #else // _MANAGED [...] inline void sp_enable_shared_from_this( shared_count const & /*pn*/, ... ) { } #endif // _MANAGED In 1.40, it's been changed to #ifdef _MANAGED [...] #else // _MANAGED inline void sp_enable_shared_from_this( ... ) { } #endif // _MANAGED Does anyone know why the change? Has anybody else seen this problem? It seems to me that GCC is correct, and that although it's an empty function so it doesn't matter anyway, the earlier version is preferable. Alternately, does anyone know of a way to silence GCC's warning? -- Dave Steffen, Ph.D - Software Engineer Numerica Corporation (www.numerica.us <http://www.numerica.us/> ) 4850 Hahns Peak Drive, Suite 200 Loveland, Colorado 80538 main (970) 461-2000 x 227 direct (970) 612-2327 fax (970) 461-2004 Email: dave.steffen(a)numerica.us

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Using rs232 libraries with Wince 5.0
by Matthew Dobrzenski 16 Sep '09

16 Sep '09

Hello, I am attempting to use the boost rs232 libraries for a wince based program I am writing. To use the serial port libraries I am including the following files: #include <boost/asio.hpp> #include <boost/asio/serial_port.hpp> Upon compilation I get the following error: fatal error C1083: Cannot open include file: 'cerrno': No such file or directory This is failing at the include of "#include <cerrno>" in the cerrno.hpp file. My compiler is visual studios 2005 (version: 8.0.50727.42), release mode, platform windows mobile 5.0 pocket pc. Thanks in advance for any help that you can offer. Matt -- Matthew J Dobrzenski Electrical Engineer/Computer Engineer

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[mpl] template parameters and mpl::if_/mpl::eval_if
by Edward Diener 16 Sep '09

16 Sep '09

I know I can try this out but I will ask here anyway just to make sure my test is not being incorrectly done. Can mpl::if_/mpl::eval_if be used to pick the type for which a default template parameter is set based on some metaprogramming boolean test of a previous template parameter type ? I know that C++ allows a template parameter default to be set based on a previous template parameter, but I don't know if mpl::if_/mpl::eval_if can be used in this context.

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gdb crash when loading lib with (big) Spirit grammar
by Christoph Duelli 16 Sep '09

16 Sep '09

I have a quite big Spirit (1.38) grammar inside a lib. (Running OpenSuSE 11.1 Linux, gcc 4.3.2, gdb 6.8.50; both 32 bit and 64 bit.) When trying to debug a programm linked against this lib, gdb crashes - when trying to read the lib's symbol table. (gdb) at 19281 Attaching to process 19281 Reading symbols from ....i_mepl_debug...done. Reading symbols from ....libMEPL_debug.so.6... Segmentation fault (core dumped) (Note that this is not my program crashing but gdb. And no, the program is not buggy, has not corrupted the stack or anything like that ;-) Debugging does work on older openSuSE (or SLES) releases, e.g. on openSuSE 10.3., SLES 10, SLES9. I have build and tried the latest gdb release, but it shows the same behaviour as the one part of the release. A stack trace of the gdb core showed that the crash seems to have occured in cplus_demangle_v3. I have searched google and found some postings that indicate the issue might stem from too long symbols being generated for Spirit (or Xpressive) constructs. (A quick glance on nm output shows, there are some symbols of some 1000 characters in size. Might be even longer ones.) Has anyone else stumbled upon this and maybe found out what the culprit is? A bug in gcc? gdb? name (de)mangling? Any ideas? Best regards Christoph

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Re: [Boost-users] building boost 1_33_1 now 1_37_0
by Dan Smithers 16 Sep '09

16 Sep '09

>> >> How do I change the includes in jam? > > Sorry, I don't understand the above. Boost.Build does not pass any > "intel includes" nor any "gcc 2.95 includes". Can you provide the commands > lines and errors in question and explain how exactly the command lines > should be altered. I've now found that as long as I make sure that gcc 3.4.3 is ahead of 2.95 in the search path I can get past the first hurdle. The command line that comes out is "icpc" -c -xc++ -O3 -Ob2 -w1 -fPIC -DBOOST_ALL_NO_LIB=1 -DBOOST_MATH_TR1_DYN_LINK -DNDEBUG -I"." -c -o "bin.v2/libs/math/build/intel-linux-release/threading-multi/hypot.o" "libs/math/build/../src/tr1/hypot.cpp" /usr/lib/pthread.h(163): error: expected a ")" extern int pthread_create(pthread_2 *__restrict __thread, ^ I have written a short test program that includes pthread.h and that compiles. thanks dan

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[Asio] Why does Boost Asio only allow 64 buffers to be sent/recei ved using scatter/gather?
by Stephens Patrick 16 Sep '09

16 Sep '09

Hi all, Apologies if this question should be directed at an Asio-specific list but I could not see one. I am curious why the Boost Asio library specifies a maximum of 64 buffers can be used for scatter/gather operations? I would like to gain a better understanding as to why this value was used. The documentation (http://www.boost.org/doc/libs/1_40_0/doc/html/boost_asio/overview/implement ation.html), and the code backs it up, seems to specify that the maximum allowed will be 'min(64, IOV_MAX)' for linux implementations. Was this value (64) chosen for some particular reason? What would the consequences be of using IOV_MAX if it was greater than 64? I see that the Windows NT, 2000, XP, 2003 and Vista implementation also has a limit of 64 so is this something limited by the OS or to keep it consistent across all the Asio implementations? I had a look around to see if there was a restriction under Windows but the only documentation I could find (http://msdn.microsoft.com/en-us/library/ms742203%28VS.85%29.aspx) mentions that it is restricted to a value of 16 under Windows 95, 98 and ME, which does tally with what the Asio documentation states in the link above. Thanks for any help, Pat. This email, including any attachment, is a confidential communication intended solely for the use of the individual or entity to whom it is addressed. It contains information which is private and may be proprietary or covered by legal professional privilege. If you have received this email in error, please notify the sender upon receipt, and immediately delete it from your system. Anything contained in this email that is not connected with the businesses of this company is neither endorsed by nor is the liability of this company. Whilst we have taken reasonable precautions to ensure that any attachment to this email has been swept for viruses, we cannot accept liability for any damage sustained as a result of software viruses, and would advise that you carry out your own virus checks before opening any attachment.

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[serialization] can load_construct_data() access private members?
by Igor R 16 Sep '09

16 Sep '09

Hello, How to grant load_construct_data() the permission to access private members of the serializable class? friend class ::boost::serialization::access; // doesn't help template<class Archive> friend void ::boost::serialization::load_construct_data(Archive &ar, MyObj *t, const unsigned int file_version); // doesn't compile with MSVC9.0SP1 One of my classes can be created with a static function only: class Foo { public: shared_ptr<Foo> create(Arg a) { shared_ptr<Foo> self(new Foo(a)); self->init(); return self; } private: Foo(Arg a); void init(); }; I try to simulate this behavior in load_construct_data() function. Thanks.

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[Date Time] Redundant warnings with w4 on MSVC
by Василий Старостин 16 Sep '09

16 Sep '09

Hi! When I try to compile my program by MSVC 9 using w4 option (maximum warnings), I got several warnings in this library headers. It prevents me from using w4 :(. How can I use Boost Date-Time library with MSVC w4 option and don't get lots of warnings? WBR, Vasily

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Re: [Boost-users] Boost-users Digest, Vol 2119, Issue 2
by N Z 16 Sep '09

16 Sep '09

Thank you Volodya, adding /MD works. Neil > Message: 2 > Date: Tue, 15 Sep 2009 09:37:27 +0400 > From: Vladimir Prus <vladimir(a)codesourcery.com> > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] link error on boost example using binary > library > Message-ID: <h8n96i$dhd$1(a)ger.gmane.org> > Content-Type: text/plain; charset=utf-8 > > N Z wrote: > >> Hi there, >> I am a beginner using boost. I am installing boost 1.40 on >> windows XP with sp3 and Visual Studio Standard 2008. I followed the >> "Getting Started on Windows"? section 5.2???"Or, Simplified Build From >> Source. to build my binaries". i.e. >> >> bootstrap >> .\bjam >> >> I then tried to run the example in section 6:Link Your Program to a >> Boost Library. >> I got expected results when link from the IDE, however, I can't link >> under command prompt, here's the output I got when compiling: >> ****************************************************************************** >> C:\Documents and Settings\Administrator\My Documents\Visual Studio >> 2008\Projects\boostBinaryLibExamp>cl /EHsc /I "c:\Program >> Files\boost\boost_1_40_0" boostBinaryLibExamp\boostBinaryLibExamp.cpp >> /link "c:\Program >> Files\boost\boost_1_40_0\stage\lib\libboost_regex-vc90-mt-1_40.lib" >> Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 15.00.21022.08 for 80x86 >> Copyright (C) Microsoft Corporation. ?All rights reserved. >> boostBinaryLibExamp.cpp >> Microsoft (R) Incremental Linker Version 9.00.21022.08 >> Copyright (C) Microsoft Corporation. ?All rights reserved. >> /out:boostBinaryLibExamp.exe >> "c:\Program Files\boost\boost_1_40_0\stage\lib\libboost_regex-vc90-mt-1_40.lib" >> boostBinaryLibExamp.obj >> LINK : fatal error LNK1104: cannot open file 'libboost_regex-vc90-mt-s-1_40.lib' >> ****************************************************************************** >> >> I searched in the lib directory, there's no such file there. But why I >> can link from IDE but not in command prompt? > > Because IDE uses dynamic runtime by default. Seems like command line compiler > wants static runtime. You should probably pass /MD to the compiler. Also, > make sure "c:\Program Files\boost\boost_1_40_0\stage\lib\" is in libraries > search patch. (/LIBPATH) > > - Volodya >

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[units] - overriding output
by Noah Roberts 15 Sep '09

15 Sep '09

What is the correct way to override the << op for a unit so that it say prints "Pa" instead of "m^-1 kg s^-2"? I tried this and no worky: #include <boost/units/io.hpp> namespace boost { namespace units { template<> inline std::string name_string< boost::units::pressure_dimension, boost::units::si::system >(const boost::units::si::pressure&) { return "Pa"; } }} // boost::units Also, I note that the operator << in io.hpp has a comment saying "INTERNAL USE ONLY". How would you suggest then that users of the library provide for stream output without running afoul of this implementation we're not meant to use?

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[serialization] how to serialize boost::function
by Igor R 15 Sep '09

15 Sep '09

Hello, Is it possible to serialize the following class: struct foo { void f1(int a) {} void f2(const std::string& s) {} void init() { using boost::bind; functors_.push_back(bind(&foo::f1, this, 1)); functors_.push_back(bind(&foo::f2, this, "test")); } std::vector<boost::function<void(void)> > functors_; }; That is, I'd like save the functors, in order to run them later, when the object is loaded from the archive. A straightforward attempt fails: struct foo { //...... friend class boost::serialization::access; template<class Archive> void serialize(Archive &ar, const unsigned int version) { ar & BOOST_SERIALIZATION_NVP(functors_); } }; 1>d:\dev\servision\projects\windows\thirdparty\boost\boost\serialization\access.hpp(109) : error C2039: 'serialize' : is not a member of 'boost::function<Signature>'

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shared_ptr<T> callback
by Vjekoslav Brajkovic 15 Sep '09

15 Sep '09

Hello! :) I'm writing a write-through cache unit which returns const shared_ptr<T>. After the data has been modified and once share_ptr goes out of scope, I would like the shared_ptr destructor to call a handler which would commit the modified value to some other location -- a DHT for instance. Is there a way to supply a callback function to shared_ptr destructor? Any help would be greatly appreciated. Please let me know if the question is too ambiguous. Thanks! V

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Re: [Boost-users] lexical problem
by Anders Dalvander 15 Sep '09

15 Sep '09

pedro chaparro wrote: > in the ouput i have this : 5050?? > > the first "50" i write with > std::cout.write(buf.data(),len); > > and the second "50" plus those stange characters > > std::string datos=buf.data(); > printf("%s \n",datos); > > i suppose that those characters means that are not null terminated. right? > So how can i only take the "50" without the other characters? > > thanks > std::string does not work well with varargs, use std::string::c_str member function to convert it to a null-terminated string: printf("%s \n",datos.c_str()); Regards, Anders Dalvander

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Re: [Boost-users] lexical problem
by cliffg＠codewrangler.net 15 Sep '09

15 Sep '09

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Get results of graph cut?
by David Doria 15 Sep '09

15 Sep '09

If I do this: double flow = kolmogorov_max_flow(g, SourceNode, SinkNode); I get the value of the max flow, but how do I tell which nodes of g belong to the "source side" of the graph and which nodes belong to the "sink side"? (thinking of it as a min cut rather than a max flow problem) Also, is it possible to tell the max flow algorithm to use multiple sources/sinks? Thanks, David

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[Sigal] Combiner sample code outputs nothing
by Boost lzw 15 Sep '09

15 Sep '09

Hi there, I got nothing outputted from the following sample code on page 360 to 362 of the book "Beyond the C++ Standard". Did I missed something? Thanks in advance. Robert ============== #include <iostream> #include "boost/signals.hpp" // boost book, pp. 360 - 362 bool step0() { std::cout << "Step 0 is OK.\n"; return true; }; bool step1() { std::cout << "Step 1 is not OK. This won't do at all. \n"; return false; }; bool step2() { std::cout << "Step 2 is OK. \n"; return true; }; // we need this one as Combiner class stop_on_failure { public: typedef bool result_type; template<typename InputIterator> bool operator()(InputIterator begin, InputIterator end) const { while (begin != end); { if (!*begin) return false; ++begin; } return true; } }; int main() { boost::signal<bool (), stop_on_failure> sig; sig.connect(0, &step0); sig.connect(1, &step1); sig.connect(2, &step2); bool ok = sig(); if (ok) std::cout << "All system tests clear. \n"; else std::cout << "At least one test failed. Aborting. \n"; return 0; } ==============

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Re: [Boost-users] building boost 1_33_1 now 1_37_0
by Dan Smithers 15 Sep '09

15 Sep '09

Message: 6 Date: Tue, 15 Sep 2009 14:44:40 +0400 From: Vladimir Prus <vladimir(a)codesourcery.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Boost-users Digest, Vol 2115, Issue 4 Message-ID: <h8nr6o$1od$1(a)ger.gmane.org> Content-Type: text/plain; charset=us-ascii Dan Smithers wrote: >> >> Date: Fri, 11 Sep 2009 20:06:17 +0400 >> >> From: Vladimir Prus <vladimir(a)codesourcery.com> >> >> To: boost-users(a)lists.boost.org >> >> Subject: Re: [Boost-users] building boost 1_33_1 >> >> Message-ID: <h8dshm$bce$2(a)ger.gmane.org> >> >> Content-Type: text/plain; charset=us-ascii >> >> >> >> Dan Smithers wrote: >> >> >>> >>> I need to recompile boost 1_33_1 with the intel compiler icc 9.0 >>> >>> >>> >>> The jamfiles are trying to use 8 in /opt (which doesn't actually exist). >>> >>> >>> >>> Please can someone point me in the right direction to do this. > > Thanks for the reply. > > > > I have done some more things, and decided to try the same with boost > > 1.37 - the next version that I have been using. > > >>> >>> >>> >>> I am using >>> >>> >>> >>> ./configure CXX=icc --prefix=/vol/build --with-toolset=intel-linux >>> >>> --with-bjam=/vol/build/boost-jam-3.1.17/bin.linuxx86/bjam >> >> >> >> 1.33.1 is very old; and worse, it was using older version of Boost.Build. >> >> Therefore, I'd recommend just hacking your way around in tools/build/v2/ >> >> intel-tools.jam, or however the file is called. > > > > My problem now seems to be in the actual compilation: It tries to build > > in workarounds for gcc 2.95 and complains with about wrongly named > > header files. If this results in compilation errors, you should see the compile command after the errors. > > > > Possibly the problem is because I don't understand enough Jam to work > > out what commands are actually being run. Also, the "-d+2" option will print all commands that are run, not just those that failed. Thanks for that hint - I've edited the makefile to call bjam -d+2 so I can see that it is the call to icpc that is failing. It looks as if the intel includes are not being used and the default gcc 2.95 ones are put in instead. How do I change the includes in jam?

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CentOS 4.7 and boost 1.35+
by Timothy Chan 15 Sep '09

15 Sep '09

Hi all, I have a newbie question here. I am running CentOS4.7 and have Boost 1.32 installed. I need to upgrade to at least 1.35 but it seems that yum only brings up version 1.32 or 1.33 versions. Does anybody have any recommendations on how to upgrade? If i simply download 1.40 from the website, are there any CentOS specific directions that anybody can give? Thanks for any help I can get. -Tim

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[interprocess] theoretical questions about interprocess conditions
by Kishalay Kundu 15 Sep '09

15 Sep '09

Hi, I am designing a multithreaded application that uses interprocess_condition variables as part of my synchronization process. I have some questions about the internal workings of interprocess_condition and would be grateful if someone provides their feedback on my general design. My application is designed such that there are several threads (say A, B, C & D) that all access different chunks of data asynchronously based on individual conditions (say cA, cB, cC, cD). However, each chunk needs to be accessed in sequence. So, for a single chunk of data, an example would be as following: 1. A waits on condition cA, executes its code, then issues notification for condition cB. 2. B waits on condition cB, executes its code, then issues notification for condition cC. 2. C waits on condition cC, executes its code, then issues notification for condition cD. 2. D waits on condition cD, executes its code, then issues notification for condition cA. >From the examples on the web-site, it looks like, one can use scoped_lock and interprocess_condition in the following manner: void thread_func(...) { // example code for thread B scoped_lock < boost::interprocess::interprocess_mutex > lock( my_mutex ); cB.wait( lock ); // work code // notify next thread cC.notify_all( ); } In this case, thread B will get into the my_mutex queue and wait for thread A to notify when and the condition cB is fulfilled and then take ownership of the mutex. Question 1: If thread B locks my_mutex after thread A has already issued the cB notification, will B be able to recognize this and take ownership of the mutex? My design is such that no other thread is actually waiting for cB. If B does not recognize the condition, it will result in a stall of the whole pipeline (since it won't issue notification on cC). Is this a correct assessment? Question 2: I give below an example of the code I'm using. I'd like to know if this will generate the behavior I'm looking for. The design is based on the fact that different threads perform different operations on the data and they do these operations in a particular order (eg. A, then B, then C, then D). I divide the data up into chunks so that every thread is working on some part of the data instead of being held up. I use the try_to_lock stuff so that if a thread doesn't get an immediate lock, it just moves on to the next chunk of data and sees if it can work on that. Is this an efficient way to make use of my resources. // example function void thread_func( ... ) { scoped_lock < boost::interprocess::interprocess_mutex > my_lock( my_mutex, try_to_lock ); if( my_lock ){ cB. wait( my_lock ); // do some work cC.notify_all( ); } } Thanks in advance. I truly appreciate the help. Kish

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[random] Poisson generator
by Rupert Mazzucco 15 Sep '09

15 Sep '09

Hello, is there a reason the Poisson generator is no longer mentioned in the documentation for 1.40.0? It seems to be there and working. Cheers -- Rupert Mazzucco <mazzucco(a)iiasa.ac.at> Research Scholar, Evolution and Ecology Program IIASA - Institute for Applied Systems Analysis Schlossplatz 1, 2361 Laxenburg, Austria Phone: +43 2236 807 522 Fax: +43 2236 713 13

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[spirit] [test] Double deletion with auto-registered test suite?
by Alastair Rankine 15 Sep '09

15 Sep '09

My very simple test app (complete code below) is getting a possible double-deletion error, and it seems to have something to do with Boost Test auto-registration. Here's the error: % ./spirit2 Running 2 test cases... *** No errors detected spirit2(55443) malloc: *** error for object 0x3000101700a10: pointer being freed was not allocated *** set a breakpoint in malloc_error_break to debug zsh: abort ./spirit2 Here's the stack trace: (gdb) bt #0 0x00007fff88021b91 in malloc_error_break () #1 0x00007fff87f4b083 in free () #2 0x000000010006c3ac in boost::unit_test::framework_impl::clear (this=0x1000deec0) at framework.ipp:133 #3 0x000000010006c4aa in boost::unit_test::framework_impl::~framework_impl (this=0x1000deec0) at framework.ipp:122 #4 0x000000010006da1e in __tcf_1 () at framework.ipp:225 #5 0x00007fff87f57274 in __cxa_finalize () #6 0x00007fff87f5718c in exit () #7 0x000000010000b7bb in start () at unit_test_parameters.ipp:172 The code is compiled on MacOS X 10.6.1 with the supplied gcc 4.2 compiler. Using Boost 1.40.0 as installed by MacPorts. The Spirit guys reckon there's no heap allocation at all within their library, so that kindof points the finger at Boost Test. Also the problem goes away if you comment out one of the test cases, or remove the BOOST_AUTO_TEST_SUITE calls. Unless I'm doing something obviously wrong...? Help appreciated. #define BOOST_TEST_MODULE spirit test #include <boost/test/included/unit_test.hpp> #include <boost/spirit/include/qi.hpp> namespace qi = boost::spirit::qi; template <typename Iterator> struct MyGrammar : public qi::grammar<Iterator> { MyGrammar() : MyGrammar::base_type(sp) { using boost::spirit::char_; sp = char_(' '); } qi::rule<Iterator> sp; }; BOOST_AUTO_TEST_SUITE(SpiritTest) BOOST_AUTO_TEST_CASE(Test1) { MyGrammar<std::string::const_iterator> parser; } BOOST_AUTO_TEST_CASE(Test2) { MyGrammar<std::string::const_iterator> parser; } BOOST_AUTO_TEST_SUITE_END()

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Re: [Boost-users] Boost-users Digest, Vol 2115, Issue 4
by Dan Smithers 15 Sep '09

15 Sep '09

> Date: Fri, 11 Sep 2009 20:06:17 +0400 > From: Vladimir Prus <vladimir(a)codesourcery.com> > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] building boost 1_33_1 > Message-ID: <h8dshm$bce$2(a)ger.gmane.org> > Content-Type: text/plain; charset=us-ascii > > Dan Smithers wrote: > >> I need to recompile boost 1_33_1 with the intel compiler icc 9.0 >> >> The jamfiles are trying to use 8 in /opt (which doesn't actually exist). >> >> Please can someone point me in the right direction to do this. Thanks for the reply. I have done some more things, and decided to try the same with boost 1.37 - the next version that I have been using. >> >> I am using >> >> ./configure CXX=icc --prefix=/vol/build --with-toolset=intel-linux >> --with-bjam=/vol/build/boost-jam-3.1.17/bin.linuxx86/bjam > > 1.33.1 is very old; and worse, it was using older version of Boost.Build. > Therefore, I'd recommend just hacking your way around in tools/build/v2/ > intel-tools.jam, or however the file is called. My problem now seems to be in the actual compilation: It tries to build in workarounds for gcc 2.95 and complains with about wrongly named header files. Possibly the problem is because I don't understand enough Jam to work out what commands are actually being run. thanks dan

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link error on boost example using binary library
by N Z 15 Sep '09

15 Sep '09

Hi there, I am a beginner using boost. I am installing boost 1.40 on windows XP with sp3 and Visual Studio Standard 2008. I followed the "Getting Started on Windows" section 5.2 "Or, Simplified Build From Source. to build my binaries". i.e. bootstrap .\bjam I then tried to run the example in section 6:Link Your Program to a Boost Library. I got expected results when link from the IDE, however, I can't link under command prompt, here's the output I got when compiling: ****************************************************************************** C:\Documents and Settings\Administrator\My Documents\Visual Studio 2008\Projects\boostBinaryLibExamp>cl /EHsc /I "c:\Program Files\boost\boost_1_40_0" boostBinaryLibExamp\boostBinaryLibExamp.cpp /link "c:\Program Files\boost\boost_1_40_0\stage\lib\libboost_regex-vc90-mt-1_40.lib" Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 15.00.21022.08 for 80x86 Copyright (C) Microsoft Corporation. All rights reserved. boostBinaryLibExamp.cpp Microsoft (R) Incremental Linker Version 9.00.21022.08 Copyright (C) Microsoft Corporation. All rights reserved. /out:boostBinaryLibExamp.exe "c:\Program Files\boost\boost_1_40_0\stage\lib\libboost_regex-vc90-mt-1_40.lib" boostBinaryLibExamp.obj LINK : fatal error LNK1104: cannot open file 'libboost_regex-vc90-mt-s-1_40.lib' ****************************************************************************** I searched in the lib directory, there's no such file there. But why I can link from IDE but not in command prompt? btw, the boostPro installer only has version 1.39, right? I want to use 1.40. Thanks, Neil

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