March 2020 - Boost-users - lists.preview.boost.org

Uploading a file to a Boost Beast Server
by Bill Moo 24 Mar '20

24 Mar '20

I am using Beast 277 and code from the advanced server example as the basis for my own one. As part of the functionality I need to allow users the ability to upload a file to the server via their browser. So I had a look at the 'Deferred Body Type' in the examples provided but I can't see how I can make use of it in my own server, although I have tried but fall foul of the SyncReadStream. Is there a working example anywhere of how I can capture and save a file uploaded to the server by a user please. -- Bill

2 2

asio, beast and concepts
by David P. Riedel 24 Mar '20

24 Mar '20

Hi I have been experimenting with some C++20 concepts code. Currently, I have a program which uses beast and asio to do some network file transfers. I was thinking of adding a small piece of code to my code which includes a concept. Prior to doing this, I tried building the beast tests from the 1.72 version with concepts enabled in the compiler. I got lots of errors such as the one below. beast/http/write.cpp:313:44: error: use of ‘auto boost::beast::http::async_write(AsyncWriteStream&, const boost::beast::http::message<isRequest, Body, Fields>&, WriteHandler&&, typename std::enable_if<(! boost::beast::http::is_mutable_body_writer<Body>::value)>::type*) [with AsyncWriteStream = boost::beast::test::stream; bool isRequest = false; Body = boost::beast::http::basic_string_body<char>; Fields = boost::beast::http::basic_fields<std::allocator<char> >; WriteHandler = boost::asio::basic_yield_context<boost::asio::executor_binder<void (*)(), boost::asio::executor> >; typename std::enable_if<(! boost::beast::http::is_mutable_body_writer<Body>::value)>::type = void]’ before deduction of ‘auto’ 313 | async_write(ts, m, do_yield[ec]); | ^ Are beast and asio not concepts ready? Or am I missing something? Is there some flag I need to set? My set up: boost: 1.72 gcc: 9.3 I added -std=c++2a -fconcepts to compile flags in my user-config.jam file to enable compiler concepts support. I have no problems using these compiler flags with other non-boost code. Thanks

4 7

[Newbie][Interprocess] Placing a boost interprocess vector in an existing (not managed) shared memory
by Gaier, Bjoern 17 Mar '20

17 Mar '20

Hello Boost-Mailing-List, I have a question about the boost interprocess library - and I hope I can explain it correctly. I looked at the "Quick guide for the impatient" about the interprocess library - but I'm not sure if I can use this for our purpose. The main goal is to insert a STL vector (or different container) in a predefined portion of an already existing shared memory. The main problem is, that we cannot use the managed_shared_memory code from boost, because we rely on a different API to allocate the shared memory between Windows and other devices. Also the container should be placed at a fixed offset inside the created shared memory. I'm a complete newbie with boost and the interprocess library, that is why I'm not sure which interface I have to provide for the interprocess vector to be setup correctly. I hoped I could do something like: new (srh_mem_base + offset) boost::interprocess::vector<allocator>; I tried looking into the headers of the library to get an idea of that, but I honestly got lost. I'm really sorry if this a stupid or obvious question - and I thank for any help in advance! Kind greetings Björn Als GmbH eingetragen im Handelsregister Bad Homburg v.d.H. HRB 9816, USt.ID-Nr. DE 114 165 789 Geschäftsführer: Dr. Hiroshi Nakamura, Dr. Robert Plank, Markus Bode, Heiko Lampert, Takashi Nagano, Takeshi Fukushima. Junichi Tajika

3 3

Is iterator_facade still relevant in C++11, C++17?
by Mateusz Loskot 14 Mar '20

14 Mar '20

Hi, This is a bit theoretical question, but I'd like to collect some opinions. Considering sequence of C++ versions, around where, if at all, boost::iterator_facade shines less and becomes less relevant? In other words: - If you had to implement iterators in C++11, would you use it? - If you had to implement iterators in C++17, would you use it? Has anyone observed performance issues when using iterator_facade? Best regards, -- Mateusz Loskot, http://mateusz.loskot.net

3 4

bimap: one to many
by MM 13 Mar '20

13 Mar '20

Hello I want a collection to store a relationship N to M like so: Item of type A Item of type B A1 B1,B2,B3 A2 B4 A3 B1 and I would like a convenient way to get from a A instance to the list of B instances, and vice versa, from a given B instance to the list of A instances. At runtime, the A objects are created first, then a list of B objects is created. Later, B objects get modified asynchronously and that modification need to update the relevant A instances what container to use? boost::bimap< unordered_set<A*> , unordered_set<B*> > ?

3 2

Failing to build Boost
by MANAV KUMAR 13 Mar '20

13 Mar '20

Hi , I am Manav Kumar. I was trying to install boost version 1.72 on my system Mac OSX. But after installing the package from it’s website and running the ./bootstrap.sh command while being in it’s directory I am getting the following error :- ' Building Boost.Build engine with toolset clang… Failed to build Boost.Build build engine Consult ‘bootstrap.log’ for more details. ‘ And I am hardly able to understand the bootstrap.log file to figure out the problem. Somebody please help me with it. Regards Manav

2 1

shared memory objects limitation in Windows 10
by Shen, Chang (MSFC-EV43) 11 Mar '20

11 Mar '20

Hi All I am testing my class using boost. The class has a shared_memory_object member : class X { char* m_buffer; boost::interprocess::shared_memory_object *m_sram; public X(char *name) { m_buffer = (char*)malloc(128); m_sram = new(std::nothrow) boost::interprocess::shared_memory_object(boost::interprocess::open_or_create_t, name, boost::interprocess::mode_t::read_write); } } int main() { std::vector<X*> xlist; for(int i=0;i<1500;i++) { std::string name = std::to_string(i); X *x = new(std::nothrow) (name.c_str()); xlist.push_back(x); } return 0; } I test the class in Window 10 using MinGW 32bit compiler. g++ (MinGW.org GCC-8.2.0-3) 8.2.0 Copyright (C) 2018 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. I find that I only can create 1463 X objects. 1464th object will throw exception: Dynamic exception type: boost::interprocess::interprocess_exception std::exception::what: WinApi FormatMessage returned error. Why this limitation?

2 1

[Process] Hardcoding the command for shell
by Frederick Gotham 11 Mar '20

11 Mar '20

At the command line on most operating system, you can pipe a file into another program and then pipe out into a third program. For example: Take a file from the hard disk, decrypt it, and then unzip it: openssl rc4-40 -salt -d -pass pass:MyPassword < /home/frederick/monkey.tar.gz.encrypted > tar -zxf - I realise, when using Boost::Process, that we can tie the input and output streams of child processes together using 'ipstream', but I want to be able to take the above command and give it directly to the operating system (or to the 'shell'). On Linux x64 and armhf(32-Bit), the following works: child c(search_path("sh"), "-c", "openssl rc4-40 -salt -d -pass pass:MyPassword < /home/frederick/monkey.tar.gz.encrypted > tar -zxf -" ); But should I have to hardcode "sh" and "-c" into my program like that? I have tried using "shell" like this: child c( "openssl rc4-40 -salt -d -pass pass:MyPassword < /home/frederick/monkey.tar.gz.encrypted > tar -zxf -", shell ); but this doesn't work on either Linux x64 or armhf(32-Bit). I thought the whole point of "shell" was that you didn't have to hardcode "sh -c" in Linux or "cmd /c" in MS-Windows. Also if you do some web-searching for how to run a batch file in MS-Windows using boost::process, you'll see that everyone is doing this: context ctx; ctx.environment = self::get_environment(); child c = launch("cmd", "/c batch.bat", ctx); Should it be necessary to hardcode "cmd /c" like that? Shouldn't this all be taken care of by "boost::process::shell"? Frederick

2 2

[SPAM] Boost Library on Samsung A71(SM-A715F/DS) TLS handshake connection problem
by sean chang 10 Mar '20

10 Mar '20

Hi , Here comes look like a boost library connection problem on a mobile device. The SSL handshake connection problem failures happen on a new smart phone device: Samsung A71 with Android 10. Compare Devices: Pixel 3a (Android 10), Samsung A51(Android 10) or lower than Android 10 devices—> working great without problem We are design an SDK integrated Boost C++ Library with openssl for API calls, but not sure what happen on this mobile phone about boost library connection problem and reason, we are looking for solution or work around to fix this problem. Thanks a lot. below is the information what we get from boost debug. Tested Boost version: 1.67.0~1.71.0 Tested openssl: 1.0.2h and 1.1.1 Situation(1): The SSL connection is possible make connection wait for 30 sec, then we will receive system: 125 error code. attached Log file: 2020-03-10 21:02:10.794 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][handshake][146]: Arthur: SSL 2020-03-10 21:02:10.794 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][249]: Arthur: SSL 2020-03-10 21:02:10.794 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][do_connect][339]: Arthur: SSL 2020-03-10 21:02:10.794 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][258]: Arthur: SSL, error(2) 2020-03-10 21:02:10.794 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][298]: Arthur: SSL 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample D/vakten: Canceled 1 number of waiters 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][handshake][146]: Arthur: SSL 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][249]: Arthur: SSL 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][do_connect][339]: Arthur: SSL 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][258]: Arthur: SSL, error(2) 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][304]: Arthur: SSL 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::handle_connect_timeout(const boost::system::error_code&) 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample D/vakten: Connect timeout aborted 2020-03-10 21:02:10.795 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:12.722 32722-32730/com.keypasco.vaktensample I/co.vaktensampl: Compiler allocated 4266KB to compile void android.view.ViewRootImpl.performTraversals() 2020-03-10 21:02:13.811 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::handle_handshake_timeout(const boost::system::error_code&) 2020-03-10 21:02:13.811 32722-390/com.keypasco.vaktensample D/vakten: Handshake timed out 2020-03-10 21:02:13.813 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::close() 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::Socket::shutdown(boost::system::error_code&) 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][shutdown][153]: Arthur: SSL 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][249]: Arthur: SSL 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][do_shutdown][345]: Arthur: SSL 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][258]: Arthur: SSL, error(1) 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][262]: Arthur: SSL 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][map_error_code][209]: Arthur: SSL 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.814 32722-390/com.keypasco.vaktensample D/vakten: error:140E0197:lib(20):func(224):reason(407) 2020-03-10 21:02:13.815 32722-390/com.keypasco.vaktensample D/vakten: Socket.shutdown error asio.ssl error 2020-03-10 21:02:13.815 32722-390/com.keypasco.vaktensample V/vakten: + boost::asio::basic_socket<boost::asio::ip::tcp, boost::asio::executor>::lowest_layer_type& kp::web::Socket::lowest_layer() 2020-03-10 21:02:13.815 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.815 32722-390/com.keypasco.vaktensample V/vakten: + kp::web::Socket::~Socket() 2020-03-10 21:02:13.815 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][~engine][66]: Arthur: SSL 2020-03-10 21:02:13.815 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][~engine][74]: Arthur: SSL_free 2020-03-10 21:02:13.816 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.816 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/impl/context.ipp][~context][394]: Arthur: SSL 2020-03-10 21:02:13.816 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/impl/context.ipp][~context][428]: Arthur: SSL_CTX_free 2020-03-10 21:02:13.816 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.818 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::invoke_handler(boost::exception_ptr) 2020-03-10 21:02:13.818 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::WebClientImpl::handle_connect(boost::exception_ptr) 2020-03-10 21:02:13.819 32722-390/com.keypasco.vaktensample V/vakten: | + void kp::web::WebClientImpl::invoke_handler(boost::exception_ptr) 2020-03-10 21:02:13.819 32722-390/com.keypasco.vaktensample V/vakten: | | + void kp::web::ClientConnection::close() 2020-03-10 21:02:13.819 32722-390/com.keypasco.vaktensample V/vakten: | | / 2020-03-10 21:02:13.819 32722-390/com.keypasco.vaktensample V/vakten: | / 2020-03-10 21:02:13.819 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.819 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.820 32722-390/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][map_error_code][209]: Arthur: SSL 2020-03-10 21:02:13.820 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::handle_handshake(const boost::system::error_code&) 2020-03-10 21:02:13.820 32722-390/com.keypasco.vaktensample D/vakten: Canceled 0 number of waiters 2020-03-10 21:02:13.820 32722-390/com.keypasco.vaktensample E/vakten: system:125 2020-03-10 21:02:13.820 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::close() 2020-03-10 21:02:13.821 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.822 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.823 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::close() 2020-03-10 21:02:13.823 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.824 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::invoke_handler(boost::exception_ptr) 2020-03-10 21:02:13.824 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.825 32722-390/com.keypasco.vaktensample V/vakten: + boost::asio::io_service& kp::web::WebClientImpl::get_io_service() 2020-03-10 21:02:13.825 32722-390/com.keypasco.vaktensample V/vakten: + boost::asio::io_service& kp::web::ClientConnection::get_io_service() 2020-03-10 21:02:13.825 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.825 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.827 32722-390/com.keypasco.vaktensample I/vakten: KspNetworkException: SSL Connect_timeout(30). 2020-03-10 21:02:13.830 32722-390/com.keypasco.vaktensample V/vakten: + kp::client_api::v5::AppClient::~AppClient() 2020-03-10 21:02:13.830 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.830 32722-390/com.keypasco.vaktensample V/vakten: + kp::client_api::ApiClient::~ApiClient() 2020-03-10 21:02:13.830 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.831 32722-390/com.keypasco.vaktensample V/vakten: + kp::web::WebClient::~WebClient() 2020-03-10 21:02:13.831 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.831 32722-390/com.keypasco.vaktensample V/vakten: + kp::web::WebClientImpl::~WebClientImpl() 2020-03-10 21:02:13.831 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.831 32722-390/com.keypasco.vaktensample V/vakten: + kp::web::ClientConnection::~ClientConnection() 2020-03-10 21:02:13.831 32722-390/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::close() 2020-03-10 21:02:13.832 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.832 32722-390/com.keypasco.vaktensample V/vakten: / 2020-03-10 21:02:13.842 32722-32722/com.keypasco.vaktensample D/GetTasksFragment: Task list: [] Situation(2) When a launched app been SSL connection success. Press power button and turn on again. then the boost library will happen connection problem with system 2 error code, it can be happen many times until boost re-initial. attached Log: 2020-03-09 18:09:53.309 11748-11800/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::handle_connect(const boost::system::error_code&) 2020-03-09 18:09:53.309 11748-11800/com.keypasco.vaktensample V/vakten: + kp::web::ProxySetting::Type kp::web::ProxySetting::get_type() const 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: / 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: + static boost::shared_ptr<kp::web::WebProxy> kp::web::WebProxy::create(kp::web::ProxySetting::Type) 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: | + kp::web::NullProxy::NullProxy() 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: | / 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: / 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: + boost::asio::ip::tcp::socket& kp::web::Socket::get_socket() 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: / 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: + virtual void kp::web::NullProxy::connect(boost::asio::ip::tcp::socket&, const kp::web::ProxySetting&, const kp::web::Uri&) 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: / 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: + bool kp::web::Socket::is_ssl_socket() const 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample V/vakten: / 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][handshake][146] 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][249] 2020-03-09 18:09:53.310 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][do_connect][339] 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][258]: Arthur: SSL, error(2) 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][298] 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/vakten: Canceled 1 number of waiters 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample V/vakten: / 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][map_error_code][209] 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::handle_handshake(const boost::system::error_code&) 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/vakten: Canceled 1 number of waiters 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample E/vakten: system:2 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample V/vakten: + void kp::web::ClientConnection::close() 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample V/vakten: | + void kp::web::Socket::shutdown(boost::system::error_code&) 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][shutdown][153] 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][249] 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][do_shutdown][345] 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][258]: Arthur: SSL, error(1) 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][perform][262] 2020-03-09 18:09:53.311 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][map_error_code][209] 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample V/vakten: | / 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample D/vakten: | error:140E0197:lib(20):func(224):reason(407) 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample D/vakten: | Socket.shutdown error asio.ssl error 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample V/vakten: | + boost::asio::basic_socket<boost::asio::ip::tcp, boost::asio::executor>::lowest_layer_type& kp::web::Socket::lowest_layer() 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample V/vakten: | / 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample V/vakten: | + kp::web::Socket::~Socket() 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][~engine][66]: Arthur: SSL 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample D/Boost: [/home/arthur/project/boost_for_android/svn/vakten-lib/trunk/target/dependency/include/boost/asio/ssl/detail/impl/engine.ipp][~engine][74]: Arthur: SSL_free 2020-03-09 18:09:53.312 11748-11800/com.keypasco.vaktensample V/vakten: | /

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Question about Boost::Interprocess::Allocators.
by Da Xu 09 Mar '20

09 Mar '20

Hi folks, I got a question about the boost::interprocess::allocators. I am a little confused as to when to use the standard shared memory allocator, and when to use node_allocator, or any of the other ones. What's the advantage and disadvantage of each? I read through the documentation, but it's not making a whole lot of sense. I am mainly using the allocators with the spsc_queue to transfer objects around, which may contain vectors floats or strings. One thing also confused me a little is that the non-standard shared memory allocators are all marked as not thread safe? I am not sure what does this mean. I assume these allocators will be interprocess safe? As in, I don't need to lock the shared memory to allocate memory, right? Maybe it means I can't share these allocators between threads in the same process? Any thoughts/tips would be greatly appreciated. Thank you. Da.

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