Hi friends,<div><br></div><div>I&#39;m getting helgrind errors using asio::ip::tcp::socket::async_connect while at the same time io_service::run is running in a thread pool. The reports is:</div><div><br></div><div>--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------</div>
<div><div>Possible data race during read of size 8 at 0x507bb50 by thread #6</div><div>==13316==    at 0xDDF1CC: boost::asio::detail::epoll_reactor::descriptor_state::perform_io(unsigned int) (epoll_reactor.ipp:610)</div>
<div>==13316==    by 0xDDF355: boost::asio::detail::epoll_reactor::descriptor_state::do_complete(boost::asio::detail::task_io_service*, boost::asio::detail::task_io_service_operation*, boost::system::error_code const&amp;, unsigned long) (epoll_reactor.ipp:648)</div>
<div>==13316==    by 0xD7CF93: boost::asio::detail::task_io_service_operation::complete(boost::asio::detail::task_io_service&amp;, boost::system::error_code const&amp;, unsigned long) (task_io_service_operation.hpp:37)</div>
<div>==13316==    by 0xE17469: boost::asio::detail::task_io_service::do_run_one(boost::asio::detail::scoped_lock&lt;boost::asio::detail::posix_mutex&gt;&amp;, boost::asio::detail::task_io_service::thread_info&amp;, boost::asio::detail::op_queue&lt;boost::asio::detail::task_io_service_operation&gt;&amp;, boost::system::error_code const&amp;) (task_io_service.ipp:394)</div>
<div>==13316==    by 0xE1713B: boost::asio::detail::task_io_service::run(boost::system::error_code&amp;) (task_io_service.ipp:146)</div><div>==13316==    by 0xE176FC: boost::asio::<b>io_service::run</b>() (io_service.ipp:59)</div>
<div>==13316==    by 0xF97421: Common::ServiceRunner::ServiceThread() (ServiceRunner.cpp:67)</div></div><div>....</div><div><br></div><div><div>This <b><i><u><font face="times new roman, serif" size="4">conflicts</font></u></i></b> with a previous write of size 8 by thread #9</div>
<div>==13316==    at 0xDDE5EF: boost::asio::detail::epoll_reactor::register_descriptor(int, boost::asio::detail::epoll_reactor::descriptor_state*&amp;) (epoll_reactor.ipp:156)</div><div>==13316==    by 0xE75C34: boost::asio::detail::reactive_socket_service_base::do_open(boost::asio::detail::reactive_socket_service_base::base_implementation_type&amp;, int, int, int, boost::system::error_code&amp;) (reactive_socket_service_base.ipp:152)</div>
<div>==13316==    by 0xE7B6E2: boost::asio::detail::reactive_socket_service&lt;boost::asio::ip::tcp&gt;::open(boost::asio::detail::reactive_socket_service&lt;boost::asio::ip::tcp&gt;::implementation_type&amp;, boost::asio::ip::tcp const&amp;, boost::system::error_code&amp;) (reactive_socket_service.hpp:106)</div>
<div>==13316==    by 0xE79FF7: boost::asio::stream_socket_service&lt;boost::asio::ip::tcp&gt;::<b>open</b>(boost::asio::detail::reactive_socket_service&lt;boost::asio::ip::tcp&gt;::implementation_type&amp;, boost::asio::ip::tcp const&amp;, boost::system::error_code&amp;) (stream_socket_service.hpp:127)</div>
<div>==13316==    by 0xE78904: void boost::asio::basic_socket&lt;boost::asio::ip::tcp, boost::asio::stream_socket_service&lt;boost::asio::ip::tcp&gt; &gt;::<b>async_connect</b>&lt;boost::asio::detail::wrapped_handler&lt;boost::asio::io_service::strand, boost::_bi::bind_t&lt;void, boost::_mfi::mf2&lt;void, Common::Comms::TCPClient, boost::system::error_code const&amp;, boost::asio::ip::basic_resolver_iterator&lt;boost::asio::ip::tcp&gt; &gt;, boost::_bi::list3&lt;boost::_bi::value&lt;boost::shared_ptr&lt;Common::Comms::TCPClient&gt; &gt;, boost::arg&lt;1&gt; (*)(), boost::_bi::value&lt;boost::asio::ip::basic_resolver_iterator&lt;boost::asio::ip::tcp&gt; &gt; &gt; &gt; &gt; &gt;(boost::asio::ip::basic_endpoint&lt;boost::asio::ip::tcp&gt; const&amp;, boost::asio::detail::wrapped_handler&lt;boost::asio::io_service::strand, boost::_bi::bind_t&lt;void, boost::_mfi::mf2&lt;void, Common::Comms::TCPClient, boost::system::error_code const&amp;, boost::asio::ip::basic_resolver_iterator&lt;boost::asio::ip::tcp&gt; &gt;, boost::_bi::list3&lt;boost::_bi::value&lt;boost::shared_ptr&lt;Common::Comms::TCPClient&gt; &gt;, boost::arg&lt;1&gt; (*)(), boost::_bi::value&lt;boost::asio::ip::basic_resolver_iterator&lt;boost::asio::ip::tcp&gt; &gt; &gt; &gt; &gt; const&amp;) (basic_socket.hpp:712)</div>
<div>==13316==    by 0xE7376B: Common::Comms::TCPClient::HandleResolve(boost::system::error_code const&amp;, boost::asio::ip::basic_resolver_iterator&lt;boost::asio::ip::tcp&gt;) (TCPClient.cpp:297)</div></div><div>--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------</div>
<div><br></div><div>I found that async_connect is not real problem, but <b><font size="4">opening a socket</font></b> is, when io_service::run is running.</div><div><br></div><div>Is this problem known or someone can suggest me a workaround ?</div>
<div><br></div><div>Many thanks in advance,</div><div>Jinqiang ZHANG</div>