我使用C++ Rest SDK ("Casablanca")從Websocket服務器接收提要。目前,我使用websocket_callback_client class同時運行三個不同服務器的三個不同服務器。C++ Rest SDK卡薩布蘭卡Sigtrap
該程序運行一個未定義的時間,然後突然收到SIGTRAP, Trace/ Breakpoint trap
。這是GDB
輸出:
#0 0x00007ffff5abec37 in __GI_raise (sig=5) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x000000000047bb8e in pplx::details::_ExceptionHolder::~_ExceptionHolder()()
#2 0x000000000044be29 in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release()()
#3 0x000000000047fa39 in pplx::details::_Task_impl<unsigned char>::~_Task_impl()()
#4 0x000000000044be29 in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release()()
#5 0x00007ffff6feb09f in std::__shared_count<(__gnu_cxx::_Lock_policy)2>::~__shared_count (this=0x7fffc8021420, __in_chrg=<optimized out>) at /usr/include/c++/4.8/bits/shared_ptr_base.h:546
#6 0x00007ffff6fffa38 in std::__shared_ptr<pplx::details::_Task_impl<unsigned char>, (__gnu_cxx::_Lock_policy)2>::~__shared_ptr (this=0x7fffc8021418, __in_chrg=<optimized out>) at /usr/include/c++/4.8/bits/shared_ptr_base.h:781
#7 0x00007ffff6fffa52 in std::shared_ptr<pplx::details::_Task_impl<unsigned char> >::~shared_ptr (this=0x7fffc8021418, __in_chrg=<optimized out>) at /usr/include/c++/4.8/bits/shared_ptr.h:93
#8 0x00007ffff710f766 in pplx::details::_PPLTaskHandle<unsigned char, pplx::task<unsigned char>::_InitialTaskHandle<void, void web::websockets::client::details::wspp_callback_client::shutdown_wspp_impl<websocketpp::config::asio_tls_client>(std::weak_ptr<void> const&, bool)::{lambda()#1}, pplx::details::_TypeSelectorNoAsync>, pplx::details::_TaskProcHandle>::~_PPLTaskHandle() (this=0x7fffc8021410, __in_chrg=<optimized out>)
at /home/cpprestsdk/Release/include/pplx/pplxtasks.h:1631
#9 0x00007ffff716e6f2 in pplx::task<unsigned char>::_InitialTaskHandle<void, void web::websockets::client::details::wspp_callback_client::shutdown_wspp_impl<websocketpp::config::asio_tls_client>(std::weak_ptr<void> const&, bool)::{lambda()#1}, pplx::details::_TypeSelectorNoAsync>::~_InitialTaskHandle() (this=0x7fffc8021410, __in_chrg=<optimized out>) at /home/cpprestsdk/Release/include/pplx/pplxtasks.h:3710
#10 0x00007ffff716e722 in pplx::task<unsigned char>::_InitialTaskHandle<void, void web::websockets::client::details::wspp_callback_client::shutdown_wspp_impl<websocketpp::config::asio_tls_client>(std::weak_ptr<void> const&, bool)::{lambda()#1}, pplx::details::_TypeSelectorNoAsync>::~_InitialTaskHandle() (this=0x7fffc8021410, __in_chrg=<optimized out>) at /home/cpprestsdk/Release/include/pplx/pplxtasks.h:3710
#11 0x00007ffff71f9cdd in boost::_bi::list1<boost::_bi::value<void*> >::operator()<void (*)(void*), boost::_bi::list0> (this=0x7fffdc7d7d28, [email protected]: 0x479180 <pplx::details::_TaskProcHandle::_RunChoreBridge(void*)>, a=...)
at /usr/local/include/boost/bind/bind.hpp:259
#12 0x00007ffff71f9c8f in boost::_bi::bind_t<void, void (*)(void*), boost::_bi::list1<boost::_bi::value<void*> > >::operator() (this=0x7fffdc7d7d20) at /usr/local/include/boost/bind/bind.hpp:1222
#13 0x00007ffff71f9c54 in boost::asio::asio_handler_invoke<boost::_bi::bind_t<void, void (*)(void*), boost::_bi::list1<boost::_bi::value<void*> > > > (function=...) at /usr/local/include/boost/asio/handler_invoke_hook.hpp:69
#14 0x00007ffff71f9bea in boost_asio_handler_invoke_helpers::invoke<boost::_bi::bind_t<void, void (*)(void*), boost::_bi::list1<boost::_bi::value<void*> > >, boost::_bi::bind_t<void, void (*)(void*), boost::_bi::list1<boost::_bi::value<void*> > > > (function=..., context=...) at /usr/local/include/boost/asio/detail/handler_invoke_helpers.hpp:37
#15 0x00007ffff71f9b2e in boost::asio::detail::completion_handler<boost::_bi::bind_t<void, void (*)(void*), boost::_bi::list1<boost::_bi::value<void*> > > >::do_complete (owner=0x7488d0, base=0x7fffc801ecd0)
at /usr/local/include/boost/asio/detail/completion_handler.hpp:68
#16 0x00000000004c34c1 in boost::asio::detail::task_io_service::run(boost::system::error_code&)()
#17 0x00007ffff709fb27 in boost::asio::io_service::run (this=0x7ffff759ab78 <crossplat::threadpool::shared_instance()::s_shared+24>) at /usr/local/include/boost/asio/impl/io_service.ipp:59
#18 0x00007ffff7185a81 in crossplat::threadpool::thread_start (arg=0x7ffff759ab60 <crossplat::threadpool::shared_instance()::s_shared>) at /home/cpprestsdk/Release/include/pplx/threadpool.h:133
#19 0x00007ffff566e184 in start_thread (arg=0x7fffdc7d8700) at pthread_create.c:312
#20 0x00007ffff5b8237d in clone() at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
在行#18的soruce /pplx/threadpool.h:133中給出。 這是圍繞這些線的源代碼:
123 static void* thread_start(void *arg)
124 {
125 #if (defined(ANDROID) || defined(__ANDROID__))
126 // Calling get_jvm_env() here forces the thread to be attached.
127 get_jvm_env();
128 pthread_cleanup_push(detach_from_java, nullptr);
129 #endif
130 threadpool* _this = reinterpret_cast<threadpool*>(arg);
131 try
132 {
133 _this->m_service.run();
134 }
135 catch (const _cancel_thread&)
136 {
137 // thread was cancelled
138 }
139 catch (...)
140 {
141 // Something bad happened
142 #if (defined(ANDROID) || defined(__ANDROID__))
143 // Reach into the depths of the 'droid!
144 // NOTE: Uses internals of the bionic library
145 // Written against android ndk r9d, 7/26/2014
146 __pthread_cleanup_pop(&__cleanup, true);
147 throw;
148 #endif
149 }
150 #if (defined(ANDROID) || defined(__ANDROID__))
151 pthread_cleanup_pop(true);
152 #endif
153 return arg;
154 }
爲了清楚起見,m_service
是boost::asio::io_service
。 對我來說,它看起來像#133行拋出一個異常,它被捕獲在#139行,然後rethrown。在這一點上,我必須親自抓住它,因爲如果我不這樣做,pplx
-object會被未捕獲的異常破壞,它會提升SIGTRAP
。
這就是我的研究成果。問題是我沒有線索發生這種情況。我已經包圍了每個通過websocket_callback_client
發送或從try {} catch(...){}
收到數據的位置,並且它仍在發生。
也許有人曾經使用過這個庫可以幫助我。
我得到了完全相同的錯誤,你最終設法解決這個問題嗎? –
這是很久以前,但我認爲這是因爲我試圖通過一個封閉的套接字發送數據。 – Bobface
這似乎是關於這個特定SDK的令人恐懼的事情之一。他們使用他們的線程池,但它並不容易出現異常,所以你最終得到了SIGTRAP。我發現在他們的任務中,如果你使用'.then()',那麼你的異常就不會被捕獲。您需要獲得任務,然後執行'.get()',然後銷燬任何形式的併發,因爲您現在被阻止在get上。 –