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我一直在为游戏进行线程网络，但是服务器随机死机，而我一直在测试网络，以便我有几个客户端连接并发送一堆数据包并断开连接然后再次连接。

我正在使用带有 SFML/网络和 SFML/系统线程的 c++。我有一个线程，一旦建立连接，它就会在服务器中侦听连接，它会创建两个新线程来发送和接收数据包。事件处理程序和发送/接收线程与两个 std::queue 共享数据。我一直在尝试使用 gdb 调试崩溃，但我对此没有那么经验，所以我正在寻求帮助。

这是崩溃发生时的 gdb 控制台输入。

OUT: 10 1 HELLO
IN: 10 0 LOLOLOL
OUT: 10 1 HELLO
IN: 10 0 LOLOLOL
OUT: 10 1 HELLO
Out thread killed by in thread!
In thread died!
New client connected!
[Thread 0x34992b70 (LWP 16167) exited]
[New Thread 0x3118bb70 (LWP 16186)]
terminate called without an active exception

Program received signal SIGABRT, Aborted.
[Switching to Thread 0x35193b70 (LWP 16166)]
0x00110416 in __kernel_vsyscall ()

这是回溯：

(gdb) backtrace
#0  0x00110416 in __kernel_vsyscall ()
#1  0x46a0967f in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#2  0x46a0afb5 in abort () at abort.c:92
#3  0x47b8af0d in __gnu_cxx::__verbose_terminate_handler () at ../../../../libstdc++-v3/libsupc++/vterminate.cc:95
#4  0x47b88c84 in __cxxabiv1::__terminate (handler=0x47b8adc0 <__gnu_cxx::__verbose_terminate_handler()>) at ../../../../libstdc++-v3/libsupc++/eh_terminate.cc:40
#5  0x47b88cc0 in std::terminate () at ../../../../libstdc++-v3/libsupc++/eh_terminate.cc:50
#6  0x47b8878f in __cxxabiv1::__gxx_personality_v0 (version=1, actions=10, exception_class=890844228, ue_header=0x35193dc0, context=0x35192ea0)
    at ../../../../libstdc++-v3/libsupc++/eh_personality.cc:669
#7  0x46bdbfbe in _Unwind_ForcedUnwind_Phase2 (exc=0x35193dc0, context=0x35192ea0) at ../../../gcc/unwind.inc:175
#8  0x46bdc3a9 in _Unwind_ForcedUnwind (exc=0x35193dc0, stop=0x46b76fc0 <unwind_stop>, stop_argument=0x35193444) at ../../../gcc/unwind.inc:207
#9  0x46b794e2 in _Unwind_ForcedUnwind (exc=0x35193dc0, stop=0x46b76fc0 <unwind_stop>, stop_argument=0x35193444) at ../nptl/sysdeps/pthread/unwind-forcedunwind.c:132
#10 0x46b77141 in __pthread_unwind (buf=<optimized out>) at unwind.c:130
#11 0x46b6f5bb in __do_cancel () at ../nptl/pthreadP.h:265
#12 sigcancel_handler (sig=<optimized out>, si=<optimized out>, ctx=<optimized out>) at nptl-init.c:202
#13 sigcancel_handler (sig=32, si=0x35192f7c, ctx=0x35192ffc) at nptl-init.c:155
#14 <signal handler called>
#15 0x08049930 in out (data=0xb761c798) at src/layer7.cpp:40
#16 0x0804b8d7 in sf::priv::ThreadFunctorWithArg<void (*)(networkdata*), networkdata*>::Run (this=0xb761c7c8) at /usr/local/include/SFML/System/Thread.inl:48
#17 0x00116442 in sf::Thread::Run() () from /home/toni/ProjectRepos/sfml/build/lib/libsfml-system.so.2
#18 0x001166df in sf::priv::ThreadImpl::EntryPoint(void*) () from /home/toni/ProjectRepos/sfml/build/lib/libsfml-system.so.2
#19 0x46b70c5e in start_thread (arg=0x35193b70) at pthread_create.c:305
#20 0x46ab4b4e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:133

这是来自 src/layer7.cpp 的线程代码

void out(networkdata * data) {
    bool running = true;
    while(running) {
        if(data->pipe_out->pipe_empty() == false) {
            sf::Packet packet = data->pipe_out->pop_message();
            if(data->socket->Send(packet) == sf::Socket::Disconnected) {
                data->thread_in->Terminate();
                std::cout << "In thread killed by out thread!" << std::endl;
                running = false;
            }
        }
    }
    std::cout << "Out thread died!" << std::endl;
}
  • 第 40 行是 while(running) 之后的第一个 if 关键字。
  • data->pipe_out->pipe_empty() 调用 queue->empty()
  • data->pipe_out->pop_message() 是从队列中弹出前面的调用。
  • 然后它发送数据包并检查连接是否没有断开
  • 如果套接字断开连接，它将终止“in”线程并停止自己的线程。
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2 回答 2

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您需要锁定data以防止多个线程同时访问相同的数据结构。

于 2011-06-06T20:31:39.887 回答
0

一个可能的原因是异常：异常应该被线程捕获。此外，看起来 data->thread_in->Terminate() 发送取消请求，请确保所有已建立的取消处理程序在这种情况下正常工作。

于 2011-06-07T08:29:20.223 回答