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[ptr_container] memory usage causes problem with regression tests
by Martin Wille 12 May '05

12 May '05

Hello, for approximately a week now, I'm experiencing crashes when I run the regression tests. Victor told me he also noticed tests consuming unusual amounts of memory. I think I now found the culprit: the ptr_container test suite. This is the second time I notice the kernel run out of memory when once of the ptr_container tests is run. This is a problem for running the tests since the kernel then starts to kill processes. So this needs to get fixed ASAP. The ptr_set test output is: *** glibc detected *** free(): invalid pointer: 0x14347b4c *** Running 1 test case... unknown location(0): fatal error in "test_set": signal: SIGABRT (application abort requested) *** errors detected in test suite "Pointer Container Test Suite"; see standard output for details We need a way of portably specifying and enforcing time and memory limits for tests (it's not the first time I've been hit by tests running wild). We also need the authors of tests to make use of that feature, once we have it. I think displaying the time and memory used by a test in the regression results would be helpful (requires changes to Boost.Build, too, obviously). In this special case, it also would have been helpful if absolute times were printed in the output of Boost.Build, since all I have is the time-stamp from the error messages of the kernel but no way of correlating this time-stamp with the regression tests except for incidentally looking at the screen when the crashes happen. Regards, m

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shared_ptr_test fails on rsi-sol g++ 4
by Peter Dimov 12 May '05

12 May '05

Any ideas why the three use_count() tests: { boost::shared_ptr<int> pi(new int); boost::shared_ptr<void> pv(pi); boost::shared_ptr<int> pi2 = boost::static_pointer_cast<int>(pv); BOOST_TEST(pi.get() == pi2.get()); BOOST_TEST(!(pi < pi2 || pi2 < pi)); BOOST_TEST(pi.use_count() == 3); BOOST_TEST(pv.use_count() == 3); BOOST_TEST(pi2.use_count() == 3); } fail as described here: http://www.meta-comm.com/engineering/boost-regression/cvs-head/developer/ou… http://tinyurl.com/cq7qy ? -- Peter Dimov http://www.pdimov.com

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[polymorphic_downcast]
by Thorsten Ottosen 12 May '05

12 May '05

Hi, is there any reason why we cannot say Base& get_ref(); Derived& boost::polymorphic_downcast<Derived&>( get_ref() ); ? It works with pointers, shouldn't we overload for references? -Thorsten -- Thorsten Ottosen ---------------------------- www.dezide.com http://www.cs.aau.dk/index2.php?content=Research/mi www.boost.org www.open-std.org/JTC1/SC22/WG21/

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[Regression Reports] Test case categorization
by Aleksey Gurtovoy 12 May '05

12 May '05

I'd like to draw library authors' attention to a recent generalization in the explicit markup scheme which allows one to control the grouping of a particular library's test cases in the Boost-wide regression reports, as demostrated here -- http://www.meta-comm.com/engineering/boost-regression/example/developer/lib… (http://tinyurl.com/bdd5u) The generalization is aimed at improving representation of library reports in at least two common situations: 1) "Duplicate" test cases: many libraries have two or more variations of the same test case for different configurations (DLL vs. static linking, char vs. wchar_t, etc.). 2) Test cases covering corner-case/optional/advanced functionality. In both of these cases, it's common to have an explicit markup (or actual failures) painting a group of test cases in a different color for one or more deficient toolsets -- see, for example, Boost.Thread page (http://tinyurl.com/8duf6) Test case categorization allows library authors to reduce the amount of visual clutter in the reports, giving them a more organized/structured look -- ultimately improving visitors' experience. Assigning a category to a test case or a group of test cases is just a matter of specifying the 'category' attribute to the corresponding '<test>' elements in "status/explicit-failures-markup.xml", e.g. <library name="my_library"> <test name="*_dll" category="DLL"/> </library> or <library name="iterator"> <test name="is_convertible_fail" category="Corner-case tests"> <mark-failure> <toolset name="borland"/> <toolset name="borland-5_6_4"/> <toolset name="msvc"/> <toolset name="vc7"/> <note refid="2"/> </mark-failure> ... As always, feedback is more than welcome. Enjoy, -- Aleksey Gurtovoy MetaCommunications Engineering

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Sandbox vault issues
by David Abrahams 12 May '05

12 May '05

Wow. 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/home/groups/b/bo/boost-sandbox/htdocs/vault/viewers/zip.php on line 103 Warning: fread(): Length parameter must be greater than 0. in /home/groups/b/bo/boost-sandbox/htdocs/vault/viewers/zip.php on line 104 Warning: unpack(): Type x: not enough input, need 1, have 0 in /home/groups/b/bo/boost-sandbox/htdocs/vault/viewers/zip.php on line 103 Warning: array_values(): The argument should be an array in /home/groups/b/bo/boost-sandbox/htdocs/vault/viewers/zip.php on line 103 Warning: fread(): Length parameter must be greater than 0. in /home/groups/b/bo/boost-sandbox/htdocs/vault/viewers/zip.php on line 104 Filename Size Date/Time boost/typeof/config.hppSD. -- Dave Abrahams Boost Consulting www.boost-consulting.com

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[filesystem] status() if neither file nor directory?
by Beman Dawes 12 May '05

12 May '05

In http://www.esva.net/~beman/filesystem_operations_predicates.htm, the assumptions was that file system entities are either files or directories. But an operating system might support additional file system entities which can only be accessed via a specific API, and can't be accessed via fstreams or directory_iterators. For example, on some operating systems, sockets are file system entities and may be found during directory iterations, but can't be opened as either directories or fstreams. What to do? Possibilities: 1) Add an other_flag and a matching is_other() function. Change definition of exists() to status() & (directory_flag|file_flag|other_flag) 2) Try to identify specific other types like sockets, and define flags and predicate functions for each. Handle future needs by saying an implementation has to define suitable flags and predicate functions for any additional kinds of files. 3) Treat such entities as files. 4) Treat such entities as errors. 5) Treat such entities as not found. To me, (1) seems best. (2) is too open ended, and without a matching API to access the additional types, doesn't do much beyond (1). The others are not acceptable because they are misleading and don't match expectations. Comments? --Beman

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[ptr_container] references & copyability etc (was [ptr_container] indirect_fun - do we still need it?)
by Pavel Chikulaev 11 May '05

11 May '05

"Thorsten Ottosen" <nesotto(a)cs.auc.dk> wrote in message news:d5tnql$2ll$1@sea.gmane.org... > what do you need the returned reference for? Just remembering rule: "Create your own classes that behave like int". isn't it? And IMO we should return reference to do these things: template<typename T> class ptr_cc_vector : public ptr_vector<T> //User's class to enable copyability { public: ptr_cc_vector(const ptr_cc_vector & that) : ptr_vector<T>(that.clone()) {} ptr_cc_vector & operator = (const ptr_cc_vector & that) { return *this = that.clone(); // :))) //Above is a bit better than //*this = that.clone(); //return *this; :)) } }; So, using ptr_container::clone is some kind of _very_ explicit copy constucting and assignment operator. Compare: a = b; a = ( b.clone() ); a(b); a( b.clone() ); and should behave like oridinal copy ctor and operator =. /////////////////////////// Let's start a new discussion about copyability :) I find ptr_cc_vector<T> very handy. Why not just enable copy ctor and assignment operator but in docs you will say explicitly that invoking copy ctor and assignment operator can be very very expensive in capital letters?? Or compromise: Add policy class By default ptr_containers are not copyconstructible, but it can be redefined if someone is willing to make ptr_containers copyconstructible template<typename T, ...., bool EnableCopyCtorAnd = DefaultBehavior> class ptr_vector; Someone, like you, will make DefaultBehavior for his ptr_containers Forbid. Someone, like me, will make DefaultBehavior for his ptr_containers Permit. IMO quite flexible, and everybody will be happy :) P.S. What's about clone_allocators - are they going to be not stateless or not? -- Pavel Chikulaev

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Formal Review Request -- Interfaces
by Jonathan Turkanis 11 May '05

11 May '05

Hi, I would like to propose the proposed Boost Interfaces library, which I introduced several months ago, for formal review. (Or maybe I should say: I'd like to nominate the candidate Boost Interfaces library.) See http://www.kangaroologic.com/interfaces/ for download and documentation. The version to be reviewed will include a number of changes from the above version; in particular, about half of the features described in "Future Directions" will be implemented. However, the above version is self-contained and suitable for review, so I would like to propose it now and work on integrating the changes while it is sitting in the review queue. Jonathan

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[ptr_container] indirect_fun - do we still need it?
by Pavel Chikulaev 11 May '05

11 May '05

Thorsten, Now, when we got rid of ptr_iterators, we don't need indirect_fun, do we? At least as part of ptr_container library? P.S. About copyability: may be then provide some cloning mechanism like: ptr_vector<int> a; ptr_vector<int> b(a.clone()); b = a.clone(); Where ptr_vector<T>::clone doesn't create clone immeadiately, but returns some object that refers to this, and ptr_vector<T> has ctor and assignment operator taking that object. Thoughts? -- Pavel Chikulaev

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Re: (Another) socket streams library
by Nathan Myers 11 May '05

11 May '05

I was directed to this thread after some work to make GNU libstdc++ expose POSIX pipe semantics at the istream::readsome() level, which probably will show up in release 4.0.1. (Cf. http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21286 ) It started me thinking about how to make an iostream useful when attached to a non-blocking socket. Reading this thread, it seems to me you have stepped in the same trap as most other attempts. There are many, many libraries to make various sources and sinks, including sockets, look like iostreams, but without actually being iostreams. We don't seem to find ourselves using them. For nonblocking socket support to be widely useful, it must be possible to pass such a stream to a library that takes a regular istream& or ostream& argument. This has been characterized as impossible, because iostream semantics are not compatible with non-blocking I/O. While the latter is true, the former is not. The key to the paradox is the expression "out-of-band". The owner of the stream may know things about it, and its underlying socket, that the user of the istream or ostream does not, and can act accordingly. Most particularly, the owner may know that the amount of input or output to be done will not cause any system calls to return EWOULDBLOCK. The next question is, how do we know how much I/O we can do without blocking? It is common for select not to wake up a process for writing on a socket until there is more than (say) 4K of space in the output buffer. Therefore, any use of the socket that will not produce more than 4K of output is safe. An actual TCP "out-of-band" notification from the other end may help, indicating that the last written data have all arrived, proving that a full 64K of buffer space awaits. On input, we must ensure that our override of streambuf::underflow is satisfied by a short read, and that the user of the attached istream will be satisfied with what it actually finds, and won't loop trying to get more. These conditions seem awfully restrictive, but there remain a large class of problems for which they are not *too* restrictive. What remains is to identify and package up all the usable out-of-band notification mechanisms associated with sockets, and try to achieve some abstraction and perhaps even (who knows?) portability. Nathan Myers ncm(a)cantrip.org

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